Vitamin B6

Vitamin makers chemically synthesize pyridoxine hydrochloride for feed fortification. One documented industrial route starts with inexpensive alanine and uses several reactions to make a concentrated powder that food makers add through a premix.^6,11

1. 01 // Source Alanine This readily available amino acid starts a documented industrial route to vitamin B6.
2. 02 // Process Build an oxazole Chemical reactions turn the starting material into an oxazole used to build the vitamin.
3. 03 // Process Form the ring The oxazole reacts with a protected butene diol, forming a precursor of pyridoxine.
4. 04 // Process Add acid Further reactions with hydrochloric acid yield pyridoxine hydrochloride, the commercial feed form.
5. 05 // Output Vitamin B6 powder The purified powder is measured into a premix for distribution through the food batch.

1. 01

   Meets a nutrient minimum

   Dogs need B6 even when the main ingredients vary. A measured addition helps the finished food meet the nutrient minimum for its stated life stage.⁹

2. 02

   Makes fortification practical

   The additive arrives as a concentrated powder. Putting it into a premix makes the small required amount easier to distribute through a large food batch.⁶

3. 03

   Uses little raw material

   A documented industrial route starts with inexpensive, readily available alanine. The nutrient minimum is measured in milligrams per kilogram of food, so fortification uses little powder.^9,11

How much The AAFCO dog food profile sets a minimum of 1.5 mg pyridoxine per kg of food on a dry matter basis, for growth and adult maintenance alike.⁹

1. Vets say

   Vitamin B6 prevents deficiency anemia

   Outruns the evidence

   Evidence

   1. Strong
   2. Some
   3. Thin
   4. None

   A 1940 study in four anemic dogs found synthetic B6 relieved the anemia, and a 1946 study found three B6 forms equally effective for growth and blood regeneration in deficient dogs. Both treated an existing deficiency, not prevention, so the claim overstates the evidence.^1,2

2. Brands say

   Vitamin B6 supports normal protein metabolism

   Evidence

   1. Strong
   2. Some
   3. Thin
   4. None

   B6 supplies a coenzyme used in amino acid reactions, and deficient dogs regained growth after treatment in a small depletion study. That supports adequate intake. It does not show that more B6 improves protein use in an adequately fed dog.^1,5

3. Owners say

   Water soluble B6 cannot harm dogs

   Outruns the evidence

   Evidence

   1. Strong
   2. Some
   3. Thin
   4. None

   All 10 dogs given prolonged oral pyridoxine dosing that rose to 150 mg/kg per day developed neurologic disease. Examination of their tissues found nerve damage. These were extreme supplement doses, but the results disprove the claim that any dose is safe.^3,4