Vitamin B6 plays a central role in amino acid metabolism — it helps your horse's body process and rearrange the amino acids from dietary protein into the specific proteins needed for muscle repair, enzyme production, and immune function. It is also essential for the synthesis of hemoglobin (the oxygen-carrying molecule in red blood cells) and several neurotransmitters that regulate mood and nerve signaling. For horses in work, B6 supports the efficient use of muscle glycogen during exercise. Like other B vitamins, pyridoxine is synthesized by the microbial population in the hindgut, and it is present in cereal grains, green forage, and most commercial feeds.
Your horse needs approximately 15 to 25 milligrams of vitamin B6 per day — roughly a small pinch of powder. This is comfortably supplied by a standard forage-and-grain diet combined with hindgut bacterial synthesis. Most commercial feeds and B-vitamin supplements include B6 as part of the complex, but standalone supplementation is unnecessary for horses on a balanced diet.
0.0% of daily nutrient intake
Vitamin B6 (Pyridoxine) makes up 0.0% of your horse's total daily nutritional requirements by weight. That's a tiny amount — but it matters.
Clinical B6 deficiency has not been well-documented in horses under normal conditions. In other species, signs include anemia, poor growth, skin lesions, confusion, and impaired immune function. A horse with severely compromised hindgut function could potentially show subtle signs such as poor coat quality or sluggish recovery from exercise.
Excess is uncommon and not a practical concern. Vitamin B6 is water-soluble and excess is excreted through the kidneys. Toxicity has not been reported in horses at dietary or supplemental levels.
| Life Stage | Size | Min | Max | Unit | Notes |
|---|---|---|---|---|---|
| Adult | — | 15 | 25 | mg | For a 500kg horse. Readily supplied by forage, grain, and hindgut bacterial production. |
Source: NRC 2007, general veterinary consensus
