Key Takeaways:

• In-Sync 4 (manufactured by Med-Vet Pharmaceuticals/MVP) combines muscle support, immune function, red blood cell production, and coat health in one pelleted supplement
• Standard feeding rate is 2 oz (56.7 g) daily, providing 5,000 mg lysine, 2,500 mg methionine, 1,000 IU natural vitamin E, and 1 mg selenium per serving
• Gradual introduction over 7-10 days prevents digestive upset and allows horses to adjust to new taste and smell
• Monitor selenium and magnesium intake from all sources to stay within safe limits (selenium: under 20 mg/day; magnesium: individualized based on total diet)
• Most horses show visible improvements in topline muscle and coat quality within 60-90 days of consistent supplementation

Transitioning your horse onto a new supplement requires a methodical approach to ensure safety, palatability, and maximum effectiveness. In-Sync 4—manufactured by Med-Vet Pharmaceuticals (MVP)—is a comprehensive muscle and immune support supplement that targets four key areas of equine health simultaneously. ^[1]

Understanding What In-Sync 4 Provides

In-Sync 4 differs from typical “4-in-1” supplements that bundle joint, gut, hoof, and calming ingredients. Instead, this pelleted formula focuses specifically on muscle function, immune system support, red blood cell production, and coat quality—making it ideal for horses needing topline development, metabolic support, or recovery assistance. ^[1]

Each 2 oz serving delivers a targeted blend of essential nutrients that work synergistically to support your horse’s conditioning and overall health.

The supplement contains 5,000 mg of lysine and 2,500 mg of methionine—the two most limiting amino acids in equine diets. ^[2] These amino acids serve as building blocks for muscle protein synthesis, supporting topline development and muscle recovery after exercise. Lysine is particularly critical for collagen formation in tendons and ligaments, while methionine acts as a powerful antioxidant protecting tissues from free radical damage. ^[3]

In-Sync 4 provides 1,000 IU of natural vitamin E (d-alpha tocopheryl) per serving rather than synthetic dl-alpha tocopherol. ^[1] Natural vitamin E demonstrates superior bioavailability in horses, with research showing it raises serum levels 2-6 times more effectively than synthetic forms depending on formulation. ^[4] This matters significantly for horses with limited pasture access or those requiring therapeutic antioxidant support.

The supplement also includes 750 mg of dimethylglycine (DMG), a derivative of the amino acid glycine that functions as a methyl donor in cellular processes. ^[1] While research on DMG’s specific benefits in horses remains limited, it’s marketed for its potential role in oxygen utilization, muscle function, and as an antioxidant adjunct. ^[5] DMG may help reduce lactic acid buildup and support faster recovery from exercise, though horse owners should maintain realistic expectations about its effects.

Who Benefits Most from In-Sync 4

In-Sync 4 serves as a “daily base” supplement that consolidates multiple individual products into one feeding, simplifying supplement programs for horses with specific conditioning needs.

Performance horses in regular work benefit from the amino acid profile that supports muscle development and recovery. The B-vitamin complex enhances red blood cell production, improving oxygen delivery during exercise. ^[6] Horses prone to tying-up or muscle soreness may find relief from the combination of magnesium (5,000 mg), selenium (1 mg), and DMG working together to support normal muscle function. ^[1]

Older horses struggling to maintain topline despite adequate calories often lack sufficient amino acids in their diets. Mature exercising horses given supplemental lysine and threonine demonstrate improved muscle mass regardless of age, with studies showing lower body fat percentages without changes in body weight. ^[7] This suggests they’re gaining muscle while reducing fat—exactly what many horse owners seek for their seniors.

Hard keepers returning to work after time off need extra support for muscle rebuilding and immune function. In-Sync 4 provides this nutritional foundation without adding excessive calories that easy keepers don’t need.

Horses with limited pasture access miss out on fresh grass—the best natural source of vitamin E. ^[8] The natural vitamin E in In-Sync 4 helps compensate for this deficiency, though horses with diagnosed vitamin E deficiency may require additional therapeutic supplementation under veterinary guidance.

When In-Sync 4 May Not Be the Right Choice

In-Sync 4 isn’t appropriate for all horses. Those already receiving comprehensive mineral supplementation through a properly fed ration balancer or fortified complete feed may exceed safe selenium limits when In-Sync 4 is added. ^[9] The supplement provides 1 mg selenium per 2 oz serving—check your current feeding program’s selenium content before adding it.

Horses diagnosed with polysaccharide storage myopathy (PSSM) or other genetic muscle disorders require specialized nutritional management beyond what In-Sync 4 provides. Consult your veterinarian before supplementing horses with diagnosed muscle conditions.

If your horse primarily needs joint support, hoof growth, or calming effects, In-Sync 4 lacks ingredients targeting those areas. MVP makes other products like “4-in-1 H/A” or “Exceed 6-Way” that address broader health areas including joints and hooves.

Step 1: Assess Your Horse’s Current Supplement Program

Before introducing In-Sync 4, conduct a thorough audit of everything your horse currently consumes. This step prevents unintentional over-supplementation—particularly with selenium and magnesium—and helps you identify which existing supplements In-Sync 4 can replace.

Calculate Total Selenium Intake

Selenium toxicity, while uncommon with organic sources like selenium yeast, becomes a risk when multiple selenium-containing products combine in the diet. ^[10] The National Research Council recommends a daily selenium intake between 1-3 mg for most horses, with an upper safe limit of 20 mg per day for an 1,100 lb horse. ^[11]

Check these sources for selenium content:

• Commercial feeds: Most fortified concentrates provide 0.3-0.6 ppm selenium. Calculate mg per day by multiplying feed weight (in kg) by ppm level
• Ration balancers: Typically contain 3-5 mg selenium per recommended serving
• Vitamin E/Selenium supplements: Range from 1-3 mg per serving
• Complete mineral supplements: May provide 2-4 mg depending on formulation
• Forage: Selenium content varies dramatically by region; most U.S. hay provides minimal selenium except in Rocky Mountain/Great Plains areas

In-Sync 4 adds 1 mg selenium per 2 oz serving. ^[1] If your current program already provides 3-4 mg from other sources, you’re approaching the safe upper limit when In-Sync 4 is added. In these cases, you may need to discontinue separate E/Se supplements or switch to a non-fortified feed.

Review Magnesium Levels

In-Sync 4 provides 5,000 mg (5 g) of magnesium per serving—a substantial amount. ^[1] While magnesium toxicity is rare in horses with normal kidney function, excessive intake can cause loose manure and may interfere with calcium absorption over time.

Most horses require 7-15 mg magnesium per kg body weight daily, meaning a 500 kg horse needs approximately 3,500-7,500 mg per day. ^[12] In-Sync 4 alone provides the middle of this range. If you’re also feeding magnesium-supplemented complete feeds or separate magnesium products, calculate total intake to ensure you’re not substantially exceeding requirements.

Identify Supplements to Discontinue or Reduce

In-Sync 4 can typically replace:

• Standalone vitamin E and selenium supplements
• Separate amino acid products (lysine, methionine, threonine)
• Individual magnesium supplements
• B-complex vitamins
• Separate DMG products

Continue feeding separately:

• Joint support products (glucosamine, chondroitin, hyaluronic acid)
• Hoof-specific supplements (biotin above 20 mg, specialized zinc/copper for hooves)
• Digestive-focused products for ulcer-prone horses
• Calming supplements when needed

Step 2: Choose Your Introduction Method

Horses are remarkably sensitive to changes in their feed, detecting new smells and tastes that we might miss entirely. Their cautious nature toward novel foods served them well in the wild but can make supplement introduction challenging. ^[13] Two methods work reliably for transitioning onto In-Sync 4.

Method 1: Gradual Increase (Recommended for Most Horses)

This approach works best for horses with no history of feed refusal and those not currently on similar supplements.

Days 1-2: Add 1/4 oz (approximately 1/2 tablespoon) In-Sync 4 to your horse’s regular feed once daily. Mix it thoroughly with feed your horse already enjoys.

Days 3-4: Increase to 1/2 oz (approximately 1 tablespoon) once daily.

Days 5-7: Increase to 1 oz (approximately 2 tablespoons) once daily.

Day 8 forward: Feed the full 2 oz dose (one scoop provided) once daily.

This 7-day transition allows your horse’s digestive system to adapt to the new nutrient profile while also giving them time to accept the taste and smell. ^[14]

Method 2: Direct Switch with Palatability Introduction (For Picky Eaters)

Some horses need extra convincing before they’ll accept new supplements. If your horse tends to sort feed or leave supplements behind, use this approach.

Days 1-3: Offer a pinch (less than 1/4 teaspoon) of In-Sync 4 separately in your hand or a small container. Let your horse investigate and taste it without pressure. Don’t worry if they refuse—repetition builds familiarity.

Days 4-6: Mix 1/4 oz with highly palatable feed toppers like unsweetened applesauce (for non-metabolic horses), a small amount of beet pulp, or fenugreek seed if your horse has metabolic concerns. Keep portions small enough that your horse finishes everything.

Days 7-10: Gradually increase the supplement amount while reducing the palatability enhancer. Move from 1/4 oz to 1/2 oz to 1 oz over these days.

Day 11 forward: Feed the full 2 oz dose mixed into regular feed.

For metabolic horses that cannot have molasses or sweet feed, safe palatability options include:

• Ground flaxseed (1-2 tablespoons)
• Fenugreek seed powder (1 tablespoon)
• Peppermint leaves (crushed)
• Small amount of vegetable oil

Step 3: Optimal Timing and Mixing Strategies

When and how you feed In-Sync 4 affects both palatability and absorption. The pelleted form makes it easy to mix, but a few strategies maximize success.

Best Time of Day to Feed

Feed In-Sync 4 with your horse’s morning meal if possible. This ensures consistent timing and allows you to monitor consumption throughout the day. Morning feeding also means nutrients are available during peak activity periods.

For horses in intense training, splitting the dose (1 oz morning, 1 oz evening) can provide more consistent nutrient availability, though this isn’t necessary for most horses. The manufacturer’s label doesn’t specify split dosing as a requirement, so once-daily feeding is perfectly acceptable.

Mixing Techniques for Maximum Acceptance

Simply sprinkling In-Sync 4 on top of feed allows picky horses to easily sort it out. Instead, mix it thoroughly into dampened feed. The pellets slightly soften when moistened, reducing sorting behavior and improving palatability.

Adding fat to your horse’s meal improves vitamin E absorption since it’s a fat-soluble vitamin. ^[15] If your horse doesn’t already receive supplemental fat, consider adding 2-4 oz of vegetable oil to the meal containing In-Sync 4. This enhances bioavailability of the natural vitamin E and provides additional calories for hard keepers.

For horses that still refuse, try soaking the pelleted supplement in warm water for 5-10 minutes before mixing. This creates a mash-like consistency that many horses find more acceptable than dry pellets.

What to Avoid

Don’t feed In-Sync 4:

• Completely dry and separate from other feed
• With extremely high-starch meals that might interfere with mineral absorption
• Within 2 hours of feeding separate calcium supplements (spacing improves magnesium absorption)
• In such large quantities that your horse can’t finish the meal

Step 4: Monitor Your Horse’s Response

Careful observation during the first 30 days helps you catch any issues early while also documenting positive changes. Keep a simple feeding log to track patterns.

Days 1-7: Watch for Digestive Upset

Check your horse’s manure daily. Normal horse manure should be formed but not hard, breaking slightly on impact. Watch for:

• Loose or watery manure: May indicate too-rapid introduction or sensitivity to yeast/probiotic components
• Unusually firm manure: Possible sign of dehydration; ensure adequate water intake
• Decreased frequency: Monitor for signs of mild colic (pawing, looking at flanks, reduced appetite)

If digestive changes occur, reduce the In-Sync 4 dose by half for 3-4 days, then resume gradual increases. Mild changes usually resolve within 48 hours. Contact your veterinarian if manure changes persist beyond 3 days or if your horse shows signs of colic.

Days 7-30: Assess Palatability and Consumption

By the end of the first week, most horses accept In-Sync 4 readily. If yours leaves significant amounts behind:

• Verify you’re mixing it thoroughly into moistened feed
• Try adding a small amount of ground flaxseed or fenugreek
• Split the dose into smaller amounts if feeding large meals
• Check that feed hasn’t become moldy or stale (horses refuse spoiled feed faster than fresh)

Monitor water consumption. B-vitamins and some minerals may slightly increase thirst—ensure your horse always has access to fresh, clean water.

Days 30-90: Document Physical Changes

The most visible improvements appear between 60-90 days of consistent supplementation. ^[16] Track these indicators monthly:

• Topline development: Take photos from the same angle monthly to compare muscle definition along the back, loin, and hindquarters
• Coat quality: Note shine, texture, and shedding patterns (seasonal effects should be considered)
• Muscle recovery: Observe how quickly your horse recovers after rides; note any reduction in post-exercise stiffness
• Energy levels: Track willingness to work, alertness, and overall attitude
• Body condition: Monitor weight distribution and overall condition score

One horse owner reported seeing changes within the first 60 days: “My mare was grossly overweight and could not process her carb intake. I started to really notice changes in her overall weight and attitude as the terrible soreness in her feet started to change or decrease within the first 60 days of feeding her In-Sync 4.” ^[16]

Step 5: Combine with Proper Exercise and Management

Supplements alone don’t build muscle—they provide nutritional building blocks that exercise transforms into visible results. In-Sync 4 works best when paired with appropriate conditioning.

Exercise Strategies to Maximize Topline Development

Amino acids from In-Sync 4 support muscle growth, but targeted exercise stimulates that growth. ^[17] Incorporate these techniques 3-5 times weekly:

• Long-and-low work: Encourage your horse to stretch forward and down, engaging core and back muscles
• Transitions: Frequent walk-trot and trot-canter transitions activate topline muscles effectively
• Hill work: Climbing engages hindquarters and back muscles; walking downhill properly develops core strength
• Backing exercises: Regular backing strengthens loin muscles and core
• Pole work: Ground poles and cavaletti encourage horses to lift their backs and engage abdominals

Start conservatively if your horse hasn’t been in regular work. Muscle soreness from overwork defeats the purpose of supplementation. Gradual conditioning allows the amino acids in In-Sync 4 to support sustainable muscle development.

Additional Management Factors

Several management factors affect how well In-Sync 4 works:

• Adequate forage: Horses need 1.5-2% of body weight daily in forage for optimal digestion and nutrient absorption
• Proper dental care: Horses with dental problems can’t chew properly, reducing nutrient extraction from feed
• Parasite control: Heavy parasite loads interfere with nutrient absorption despite supplementation
• Stress management: Chronic stress increases nutrient demands, particularly for antioxidants and B-vitamins
• Turnout time: Regular movement supports muscle development and overall health

Common Questions About Long-Term Use

Should In-Sync 4 Be Fed Year-Round?

For most horses, year-round supplementation makes sense. Nutrient requirements don’t stop when training intensity decreases, and maintaining consistent amino acid intake prevents muscle loss during light work periods.

Exceptions include:

• Horses with full-time pasture access to lush grass (they may receive adequate vitamin E naturally)
• Horses consuming fortified complete feeds at full recommended rates that meet all nutrient requirements
• Budget constraints requiring prioritization of other health needs

If you discontinue In-Sync 4 seasonally, taper off over 7-10 days rather than stopping abruptly, then reintroduce gradually when resuming.

Can In-Sync 4 Be Combined with Other MVP Products?

MVP manufactures numerous supplements with overlapping ingredients. Combining products requires careful calculation to avoid over-supplementation.

Safe combinations (with attention to total selenium):

• In-Sync 4 + joint-specific products (Re-Inforcer EQ, joint supplements without added selenium)
• In-Sync 4 + digestive products (Gastro-Plex when selenium-free)
• In-Sync 4 + respiratory support (Airway EQ, check selenium content)

Avoid combining without nutritionist consultation:

• In-Sync 4 + Exceed 6-Way (both provide comprehensive nutrition with selenium)
• In-Sync 4 + separate E/Se supplements (selenium exceeds safe limits)
• In-Sync 4 + other amino acid products (may provide excessive lysine/methionine)

MVP is a founding member of the National Animal Supplement Council (NASC), adhering to strict manufacturing guidelines including Good Manufacturing Processes and FDA procedures for quality and consistency. ^[1] All products undergo quality assurance testing for potency and purity.

What If My Horse Stops Eating It After Initial Acceptance?

Sudden refusal after weeks or months of acceptance typically indicates:

• Feed has become stale or absorbed moisture (check expiration dates)
• Horse is feeling unwell (monitor for other signs of illness)
• Routine disruption or stress affecting appetite generally
• Developing sensitivity to ingredients (rare but possible)

Try temporarily increasing palatability enhancers. If refusal persists beyond 5-7 days despite various mixing strategies, consult your veterinarian to rule out health issues before discontinuing the supplement.

Cost Considerations and Storage

In-Sync 4 pricing sits in the mid-to-upper tier compared to feeding separate E/Se, magnesium, and amino acid products individually. ^[18] However, consolidating multiple supplements into one often results in net savings when you factor in:

• Not purchasing separate vitamin E/selenium supplements ($20-40/month)
• Not purchasing amino acid supplements ($25-50/month)
• Not purchasing separate magnesium products ($15-30/month)
• Simplified inventory management and reduced ordering frequency

A 4 lb container provides approximately 32 servings at 2 oz daily (one month supply). An 8 lb container lasts approximately two months, while a 16 lb container provides roughly four months of supplementation for one horse.

Proper Storage Extends Shelf Life

Store In-Sync 4 in its original sealed container in a cool, dry location away from direct sunlight. Ideal storage temperature ranges from 50-75°F. Excessive heat or humidity degrades vitamin potency over time, particularly vitamin E and B-vitamins.

Keep the container tightly sealed between feedings. If you transfer supplement to a smaller daily-use container for convenience, maintain the same storage conditions and never store in damp barn areas.

Check the “best by” date on the container. While supplements remain safe past this date, nutrient potency gradually declines. For optimal results, use In-Sync 4 within 6-8 months of opening.

Troubleshooting Common Challenges

My Horse Developed Loose Manure When Starting In-Sync 4

The most common cause is the probiotic and yeast components. While these support digestion, some horses need more gradual introduction. Reduce the dose to 1/2 oz daily for 5-7 days, then slowly increase by 1/4 oz every few days. This allows the hindgut microbiome to adjust.

Alternatively, the magnesium content may be causing temporary looseness. This usually resolves within a week as the body adapts. If loose manure persists beyond 10-14 days at reduced doses, discontinue In-Sync 4 and consult your veterinarian.

I’m Not Seeing the Topline Improvement I Expected

Several factors could be at play:

Insufficient time: Most horses require 60-90 days of consistent supplementation plus appropriate exercise before visible changes appear. ^[16] If you’ve been supplementing less than two months, continue the program another month before reassessing.

Inadequate exercise stimulus: Amino acids need exercise to build muscle. If your horse isn’t in regular work with exercises targeting topline muscles, supplementation alone won’t produce dramatic results.

Underlying health issues: PPID (Cushing’s disease), EPSM, PSSM, or other conditions can prevent muscle development despite proper nutrition. If your horse shows other signs like excessive drinking/urinating, abnormal fat distribution, or exercise intolerance, consult your veterinarian.

Caloric deficit: Horses can’t build muscle without adequate overall calories. Ensure your horse maintains appropriate body condition while supplementing. Hard keepers may need additional fat or fermentable fiber sources.

Poor quality protein base: If your horse’s forage is extremely mature, low-protein grass hay, they may need additional protein sources beyond what In-Sync 4 provides. Consider adding alfalfa pellets or a higher-protein ration balancer.

Can I Feed Less Than 2 oz to Reduce Selenium Intake?

Technically yes, but reducing the dose proportionally reduces all nutrients. A horse receiving 1 oz daily gets only 2,500 mg lysine instead of 5,000 mg—potentially insufficient for topline support.

If selenium intake concerns you, better solutions include:

• Switching to a non-fortified or low-selenium base feed
• Discontinuing separate E/Se supplements
• Having your hay tested to determine actual selenium content
• Consulting an equine nutritionist to formulate a balanced program that provides adequate amino acids without excessive selenium

Some endurance riders and performance horse owners routinely feed 5-7 mg selenium daily without issues, suggesting the upper safe limit provides substantial buffer. ^[19] However, individual circumstances vary—when in doubt, test your horse’s blood selenium levels to make informed decisions.

When to Consult Your Veterinarian

While In-Sync 4 is generally safe for most horses, certain situations require veterinary guidance:

• Your horse has been diagnosed with PSSM, EPSM, or other muscle disorders
• Your horse is currently on prescription medications (potential interactions)
• Your horse shows signs of selenium toxicity (hair loss from mane/tail, hoof abnormalities, joint stiffness)
• Your pregnant or lactating mare needs supplementation (always consult your vet first)
• Your horse refuses all feed when In-Sync 4 is added despite varied mixing strategies
• Your horse develops unusual symptoms after starting supplementation (hives, significant behavior changes, severe digestive upset)

If you want to verify your supplementation program is optimized, consider having blood work done. Testing serum vitamin E and selenium levels provides objective data about your horse’s status, eliminating guesswork about whether In-Sync 4 is meeting their needs.

Conclusion

Incorporating In-Sync 4 into your horse’s feeding program doesn’t need to be complicated. By gradually introducing the supplement over 7-10 days, monitoring your horse’s response carefully, and pairing it with appropriate exercise, you create the foundation for visible improvements in muscle development, immune function, and overall condition.

Remember that supplements work best as part of comprehensive management including quality forage, proper exercise, regular veterinary care, and attention to your horse’s individual needs. **In-Sync 4 provides concentrated nutritional support, but it’s your consistent daily care that transforms those nutrients into tangible results your horse’s body can use.**

Start slowly, observe carefully, and adjust as needed based on your horse’s unique response. Most owners report satisfaction with the product when used appropriately and combined with realistic expectations about timelines for improvement.

In-Sync 4 Horse Supplement FAQs

Can I use In-Sync 4 horse supplement for horses with EMS or insulin resistance?

In-Sync 4 can be appropriate for many metabolic horses since it’s low in sugar and starch, but you must carefully evaluate total selenium and magnesium intake when combined with other metabolic-specific supplements. The amino acids support muscle maintenance during calorie restriction, and the antioxidants help manage inflammation. However, avoid mixing In-Sync 4 with sugary feed toppers—use fenugreek or ground flaxseed instead for palatability. Always consult your veterinarian before supplementing horses with metabolic disorders.

How long does it take to see results from In-Sync 4 supplement?

Most horse owners notice initial coat improvements within 30-45 days of consistent In-Sync 4 use, while significant topline muscle development typically requires 60-90 days when combined with appropriate exercise. Energy levels and recovery time may improve within 2-4 weeks as the B-vitamin complex supports red blood cell production. Results vary based on the horse’s starting condition, exercise program, and overall diet quality. Taking monthly photos helps track gradual changes that you might not notice day-to-day.

Is In-Sync 4 safe to feed with other supplements for horses?

In-Sync 4 can be safely combined with joint supplements, hoof-specific products (like high-dose biotin), and digestive aids that don’t contain selenium or magnesium. However, avoid combining it with separate E/Se supplements, other amino acid products, or comprehensive multi-vitamins without first calculating total selenium intake across all sources. The safe upper limit for selenium is 20 mg/day for an average horse—In-Sync 4 provides 1 mg per serving, leaving room for other sources but requiring careful monitoring to avoid exceeding safe limits.

What is the difference between In-Sync 4 and other MVP supplements?

In-Sync 4 focuses specifically on muscle function, immune support, red blood cell production, and coat health, making it ideal for topline development and conditioning. MVP’s “4-in-1 H/A” targets joints, hooves, coat, and digestion with glucosamine and biotin. “Exceed 6-Way” provides comprehensive support across six areas including gastric health. In-Sync 4 works best for horses needing amino acid and antioxidant support without joint-specific ingredients, while horses requiring broader support might benefit from Exceed 6-Way instead.

Do I need to gradually introduce In-Sync 4 or can I start at full dose immediately?

Gradual introduction over 7-10 days is strongly recommended for In-Sync 4 horse supplement to prevent digestive upset and allow your horse to adjust to the new taste. Start with 1/4-1/2 oz daily for the first few days, then gradually increase to the full 2 oz serving. The probiotic and yeast components can cause temporary loose manure if introduced too quickly, and horses may refuse new supplements added abruptly to their feed. Only experienced horse owners with horses that readily accept feed changes should consider starting at full dose, and even then, monitor manure consistency closely.

In-Sync 4 Horse Supplement Citations

1. Med-Vet Pharmaceuticals – In-Sync 4 Product Information
2. Mad Barn Feed Bank – In-Sync 4 Nutritional Profile
3. Mad Barn – Lysine, Methionine & Threonine for Horses: 7 Reasons to Supplement
4. Kentucky Equine Research – How Is Natural-Source Vitamin E Superior to Synthetic
5. VCA Animal Hospitals – Dimethylglycine (DMG)
6. Med-Vet Pharmaceuticals – Amino Acids & Their Role in Muscle Health
7. Mad Barn – Research on Amino Acids and Muscle Mass in Mature Horses
8. Kentucky Equine Research – Choose Natural Vitamin E for Horses
9. Tribute Equine Nutrition – Selenium: Benefits, Risks, Testing & More
10. Mad Barn – 7 Research-Backed Health Benefits of Selenium for Horses
11. Kentucky Equine Research – Selenium for Horses: How Important Is It?
12. Kentucky Equine Research – Magnesium for Horses
13. Mad Barn – Giving a New Supplement to Your Horse [Guide]
14. Tribute Equine Nutrition – Safely Transitioning Your Horse’s Diet
15. Practical Horseman – Which is Better: Natural or Synthetic Vitamin E?
16. Med-Vet Pharmaceuticals – In-Sync 4 User Reviews
17. Mad Barn – How to Build Your Horse’s Topline Muscles
18. Mad Barn – In-Sync 4 Pricing and Analysis
19. Dr. K’s Horse Sense – Don’t Fear Selenium