Protein Sources For Horses



This table lists the variety of commercial protein sources available for horses. The ingredients often change so be sure to read the label for the most accurate ingredients. This list was updated December 2020 and I will not be updating it in the future (too much work).  I leave it up to you to investigate.

I still believe that feeding soybean meal alone is your best bet because:

  • it is a natural source of all the essential amino acids.
  • It is from the legume family like alfalfa, clover, birdsfoot trefoil, etc – all horses eat with few having bad reactions to.
  • It is used in ALL of the commercial feeds listed here as well as almost all other feeds
  • As an ingredient, it is the least expensive
  • As an ingredient, there are no added ingredients that inflame the gut

Other natural sources of protein are pea protein and hemp protein though they do not have the safety and efficacy track record in horses of soybean meal.

Protein Product Percent Protein Protein Sources Suspect Ingredients Unnecessary Ingredients

ProAdd Ultimate

Progressive Nutrition

55% soy protein isolate, whey concentrate, dried whey flaxseed, vegetable oil added AA’s, vitamins, minerals, probiotics, choline cloride

Top-Line Extreme

Progressive Nutrition

60% Whey protein concentrate, spray dried whey, spray dried egg wheat gluten, flaxseed, vegetable oil, rice bran oil yeast extract, AA’s flavorings

Top-Line Advance Support

Progressive Nutrition

65% none flaxseed, wheat gluten,   rice bran oil AA’s, betaine, flavorings

Pro Advantage Grass Formula

Progressive Nutrition

30% soybean meal, dehydrated alfalfa meal wheat middlings, maize distillers dried grains w/ solubles, beet pulp, lignin sulfonate, soybean oil CaCO3, minerals, vitamins, choline cloride, probiotics, flavorings


Manna Pro

25% soybean meal, dried whey, dehydrated alfalfa meal corn, hominy feed, feeding oatmeal,vegetable oil, linseed meal CaCO3, vitamins, minerals, Fenugreek, Anise (licorice) flavoring


Manna Pro

25% soybean meal, dried whey, dehydration alfalfa meal hominy feed, feeding oatmeal, linseed meal, vegetable oil CaCO3, choline chloride, vitamins, minerals, fenugreek, anise flavoring


Platinum Performance

80% whey protein concentrate none none

Equine Platinum Performance

Platinum Performance

21% whey protein concentrate flaxseed, flax oil, rice bran, sunflower seeds, cane molasses vitamins, minerals, AA’s

Barn Bag

Life Data Labs

32% soy protein concentrate, dehydrated alfalfa meal none Lecithin, AA’s, vitamins, minerals

Whey Protein Isolate Powder


90% whey protein isolate none none

Tri Amino


100% lysine, methionine, threonoine.                         (no other amino acids) none AA’s



32% dehulled soybean meal, dehydrated alfalfa meal  wheat middlings, soybean oil, rice bran oil CaCO3, AA’s, yeast, vitamins, minerals

30% Ration Balancer

Triple Crown

30% soybean meal wheat middlings, ground flaxseed, stabilized rice bran, kelp meal, lecithin, soybean oil, cane molasses AA’s, vitamins, minerals, probiotics, antacids, flavorings, preservatives

Gro ’N Win

Buckeye Nutrition

32% dehulled soybean meal, dehydrated alfalfa meal wheat middlings, heat processed soybeans, maize distillers dried grains, flaxseed CaCO3, AA’s, vitamins, minerals, yeast

Enrich Plus Ration Balancing

Purina Mills

32% unlisted ingredients on the website (see the blog “Betrayal” where a feed tag from 2018 is displayed) unlisted ingredients vitamins, minerals, prebiotic fiber

Super Sport Amino Acid Supplement

Purina Mills

40% dehulled soybean meal, soy protein concentrate, dried whey protein concentrate, alfalfa meal wheat middlings, cane molasses CaCO3, AA’s, vitamins, minerals, flavorings

Essential K


28% dehulled soybean meal, dehydrated alfalfa meal, dried whey ground extruded soybeans, wheat middlings, flaxseed, cane molasses, soybean oil CaCO3, lignan sulfonate, AA’s, vitamins, minerals, probiotics, bentonite, flavorings

Empower® Balance Grass Formula Supplement


30% unlisted ingredients on the website unlisted ingredients Vitamins, minerals, probiotics

Notes and legend:

  • AA = Amino Acids from synthesis (man-made).
  • Anise seed – licorice flavoring shown to be the most favorite flavoring in trials with horses.
  • Bentonite – a clay used as a binder and absorbant to increase shelf life. Also used as a laxative when prescribed.
  • Betaine – derrived from sugar beets it is an amino acid derrivitive.
  • CaCO3 – calcium carbonate – the calcium used in antacids such as “Tums.”
  • Choline chloride – a growth stimulant used mostly in poultry feed.
  • Lignan sulfonate – an antioxidant in flame retardants and animal feed, derrived from wood pulp production, main ingredient in plaster, concrete, sheetrock and useed for dust control on dirt roads.



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