Ingredient file // Vitamin or mineral
Pyridoxine Hydrochloride
A needed vitamin, not a wellness boost
Pyridoxine hydrochloride is a manufactured form of vitamin B6 added to help food meet its nutrient target. Dogs need B6 for normal growth and blood production. Its presence on a label is no reason to expect a benefit from extra B6.
- What it is
- A manufactured, crystalline form of vitamin B6 that supplies a measured amount of the nutrient to food.
- Made from
- Chemically synthesized starting compounds
- Main job
- Supplies vitamin B6
- Typical amount
- Not published
- Watch for
- Separate high-dose B6 supplements
- Not the same as
- Pyridoxal or pyridoxamine
Our read // In our catalog
In 1 of every 3 foods we track
Share of foods that list it
36%
922 of the 2,595 foods with an ingredient list on file, from 50 brands. 687 dry dog food, 205 wet dog food, 17 frozen dog food.
Each square is 1% of the catalog
Where it sits on the label
Median position 38. In the top five of 0 foods, so it is usually a minor ingredient.
Above the salt
Usually listed after the salt, which caps it at roughly 1% of the recipe in 98% of foods.
Price per lb
Median of the cheapest bag price across 613 priced foods, 9% below the catalog. The price is the food's, not the ingredient's.
Who leans on it
16%
of the foods that list it are from Blue. 50 brands use it in total.
The story
How a 1930s rat cure became a dog food vitamin
Vitamin B6 started as an unknown factor in rat experiments. In 1934, Paul György showed that the factor curing a rat condition called acrodynia was a distinct vitamin. Samuel Lepkovsky isolated and crystallized it in 1938. The next year, Harris and Karl Folkers, and separately Richard Kuhn's group, worked out its chemical structure, and György named the compound pyridoxine.11
Dogs were part of the early research. In 1946, Sarma, Snell and Elvehjem injected B6-deficient dogs with pyridoxine or one of its 2 natural relatives, pyridoxal and pyridoxamine. All 3 were equally good at restoring growth and blood. Pyridoxine hydrochloride made by chemical synthesis was authorized in the EU as a feed additive for all animal species in 2011, and a 2020 EFSA review found it safe for them at commercial use levels.1,6,15
What it is
How it is made
Vitamin manufacturers synthesize this ingredient rather than extracting it from food. One published route builds pyridoxine from chemical starting materials, forms its hydrochloride salt, and purifies it for use in feed.6,7
- 01 // Source Starting compounds One published route starts with purchased L-alanine and oxalic acid, rather than an extracted food material.
- 02 // Process Build an intermediate Chemical reactions turn the starting materials into an oxazole intermediate used to build pyridoxine.
- 03 // Process Form pyridoxine Further reactions form the vitamin from the oxazole intermediate in the published synthesis.
- 04 // Process Form the salt A final salt-forming step produces pyridoxine hydrochloride before purification.
- 05 // Output Dry vitamin powder The finished feed ingredient is a white to yellowish powder ready for blending into a vitamin mix.
What is in it
Composition, dry matter
82
% pyridoxine
About this much of the dry salt is pyridoxine itself. Most of the remaining weight is its chloride component.
Benefits
What it does for your dog
Each benefit carries the same evidence grade as the claims below.
-
01
Protein put to use
PLP works with more than 100 enzymes, many of which handle amino acids from dietary protein. The support is essential biochemistry. No dog trial shows that extra B6 in a complete food improves protein use.14
- Strong
- Some
- Thin
- None
-
02
Normal brain messenger supply
PLP is needed to make serotonin and dopamine. One study found lower blood B6 in dogs with epilepsy, but no trial shows that the B6 in food prevents seizures or calms dogs.13,14
- Strong
- Some
- Thin
- None
Why it is in the bag
What the manufacturer gets
-
01
Meets a vitamin target
Manufacturers add a measured B6 source so the finished food meets its nutrient target. AAFCO sets a pyridoxine minimum for complete dog food.5,6
-
02
Allows for processing losses
A swine-feed experiment found incomplete B6 recovery after extrusion and better recovery from an encapsulated form. Its tested extrusion temperatures and pelleting settings did not significantly change B6 recovery.8
-
03
Supplies a standard powder
An industrial synthesis route increased pyridoxine output and lowered its cost. Chemical manufacture supplies a concentrated ingredient that makers can measure into vitamin mixes.6,7
How much AAFCO sets a finished dog food minimum of 1.5 mg pyridoxine per kg of dry matter for growth and adult maintenance, but specifies no amount of this ingredient.5
Our read // The claims
What the evidence supports
Strong: controlled studies in dogs agree. Some: small or mixed dog data. Thin: mechanism or lab work only. None: nothing, or the evidence points the other way.
-
Vets say
Dogs need vitamin B6 for normal growth
Evidence
- Strong
- Some
- Thin
- None
In a 3-puppy depletion study, restoring B6 improved growth and blood measures. AAFCO sets a minimum for complete dog food. These findings support meeting the requirement, not giving extra B6 to a dog already eating a complete diet.1,5
-
Owners say
Vitamin B6 stops milk in false pregnancy
Outruns the evidence
Evidence
- Strong
- Some
- Thin
- None
A 40-dog trial tested daily pyridoxine hydrochloride at 50 mg per kg of body weight. Milk stopped in 10 of 10 dogs at that dose, versus 2 of 10 on placebo. Ordinary food fortification is not that treatment.2,5
-
Brands say
Added B6 calms anxious dogs
Outruns the evidence
Evidence
- Strong
- Some
- Thin
- None
A 21-dog trial tested a supplement containing B6, oils, vitamin E and herbs. Some behavior measures improved, but the trial cannot identify B6 as the cause. The supplement maker funded the study.3
-
Owners say
Water-soluble B6 is harmless at any dose
Outruns the evidence
Evidence
- Strong
- Some
- Thin
- None
Beagles given 300 mg per kg of body weight daily by mouth developed a swaying gait within 9 days, followed by sensory nerve damage. That dose is far beyond food fortification, but any-dose safety is false.4,6
The research
Studies worth knowing
Published research we read for this page, dog studies first.
-
1946 // Injection trial, 3 B6 forms
Dogs used all 3 forms of B6 equally well15
Vitamin B6-deficient dogs
Found. Researchers injected pyridoxine, pyridoxal or pyridoxamine into the veins of dogs lacking B6. All 3 forms were equally active at restoring growth and rebuilding blood.
What it means. Pyridoxine, the form on the label, works as real B6 for dogs, although this test skipped digestion.
-
2021 // Treatment trial, 4 groups
A high dose of B6 stopped false pregnancy milk like a drug16
40 female dogs with false pregnancy
Found. Dogs got 10 or 50 mg per kg of pyridoxine hydrochloride daily, cabergoline or a placebo for 20 days. The 50 mg dose stopped milk as well as cabergoline did, and the researchers found no side effects.
What it means. This is a short course of a treatment dose. It says nothing about the small amount of B6 a complete food supplies.
-
2007 // Feeding trial, 4 vitamin levels
Pet dogs' blood B6 shifted on set vitamin diets12
64 privately owned adult dogs
Found. Dogs switched from ordinary commercial foods to diets with graded vitamin amounts for 122 days. Blood pyridoxal 5'-phosphate, the active B6, was partially reduced by the end, and coat and hair did not change.
What it means. Blood B6 responds to diet, but this trial gives no sign that more B6 improves a healthy dog's coat.
-
2025 // Blood comparison study
Dogs with epilepsy had lower blood B613
49 dogs with epilepsy, 39 healthy dogs
Found. Researchers profiled plasma from 49 dogs with idiopathic epilepsy and 39 healthy dogs. Vitamin B6 was significantly lower in the dogs with epilepsy, along with changes in markers of oxidative stress and amino acid metabolism.
What it means. This links low B6 with epilepsy but cannot show cause. It does not support giving B6 for seizures.
Straight answers
What owners ask
-
Q01
Is it just filler?
NoIt supplies vitamin B6, which dogs need in small amounts. It adds no meaningful bulk to a recipe. Its place near the end of an ingredient list is expected for a vitamin.1,5,10
-
Q02
Does hydrochloride mean harmful acid?
NoHydrochloride names the salt form of pyridoxine. The feed ingredient is a purified powder, and chloride is part of its measured chemical composition.6,9
-
Q03
Can the list tell me its dose?
NoThe ingredient list ranks items by weight but gives no individual amounts. Check the nutritional adequacy statement for your dog's life stage. If you need the finished food's B6 level, ask its maker.5,10
Who uses it
Brands, best sellers and the company it keeps
Top brands, by foods that list it
Plus 40 more brands.
Amazon best sellers that list it
- #1 Blue Life Protection Formula Adult Chicken and Brown Rice Recipe Dry Dog Food
- #5 Blue Life Protection Formula Adult Small Breed Chicken and Brown Rice Recipe Dry Dog Food
- #7 Stella & Chewy’s Marie’s Magical Dinner Dust Cage-Free Chicken Recipe Freeze-Dried Raw Dog Food Topper
- #8 Diamond Naturals Skin & Coat Formula All Life Stages Salmon & Potato Formula Dry Dog Food
- #12 Pedigree Adult Grilled Steak & Vegetable Flavor Dry Dog Food
- #17 Taste of the Wild High Prairie Canine Recipe with Roasted Bison & Roasted Venison Dry Dog Food
- #22 Cesar Filet Mignon Flavor & Spring Vegetables Garnish Dry Dog Food
- #27 Blue Life Protection Formula Senior Chicken and Brown Rice Recipe Dry Dog Food
Rank on Amazon's dog food best seller list, checked October 2026.
Usually listed with, share of the foods that list it
- Chicken 41%
- Chicken Fat 39%
- Flaxseed 38%
- Peas 37%
- Chicken Meal 34%
- Natural Flavor 31%
- Oatmeal 21%
- Brown Rice 20%
- Dried Plain Beet Pulp 17%
- Barley 17%
- Sweet Potatoes 16%
- Lentils 15%
Our read // On the bag
Read it as a vitamin supply line
Pyridoxine hydrochloride near the end of an ingredient list is doing a small, necessary job. Its position cannot tell you the finished B6 level. Check that the food is complete for your dog's life stage, and do not use the listing as a reason to add a B6 supplement.
Sources
What we read
Checked September 1, 2026.
- 1 The vitamin B6 group; comparative growth and anti-anemic potencies of pyridoxal, pyridoxamine and pyridoxine for dogs
- 2 Use of pyridoxine hydrochloride in the interruption of lactation in female dogs with pseudopregnancy
- 3 Effects of a Nutritional Supplement (DìRelaxTM) on Anxiety in Dogs in a Randomized Control Trial Design
- 4 Pyridoxine megavitaminosis produces degeneration of peripheral sensory neurons (sensory neuronopathy) in the dog
- 5 AAFCO Dog and Cat Food Nutrient Profiles
- 6 Assessment of the application for renewal of authorisation of pyridoxine hydrochloride (vitamin B6) as a feed additive for all animal species
- 7 Improved Oxazole Method for the Practical and Efficient Preparation of Pyridoxine Hydrochloride (Vitamin B6)
- 8 Evaluation of Extrusion Temperatures, Pelleting Parameters, and Vitamin Forms on Vitamin Stability in Feed
- 9 Vitamin b6 hcl_pyridoxine hcl desde 1 kg
- 10 Reading Labels
- 11 A History of the Isolation and Identification of Vitamin B6
- 12 Blood vitamin concentrations in privately owned dogs fed non-standardized commercial diets and after intake of diets with specified vitamin concentrations
- 13 Plasma metabolome reveals altered oxidative stress, inflammation, and amino acid metabolism in dogs with idiopathic epilepsy
- 14 Vitamin B6
- 15 The vitamin B6 group. IX. Comparative growth and anti-anemic potencies of pyridoxal, pyridoxamine and pyridoxine for dogs (abstract record)
- 16 Use of pyridoxine hydrochloride in the interruption of lactation in female dogs with pseudopregnancy