Ingredient file // Vitamin or mineral
Thiamine Hydrochloride
A tiny vitamin addition with a real job
Thiamine hydrochloride is a manufactured form of vitamin B1 added to dog food in small amounts. It helps the finished food supply the thiamine dogs need for energy metabolism and normal nerve function, even when processing reduces the vitamin already present.
- What it is
- A crystalline form of vitamin B1 added to food to supply dietary thiamine.
- Made from
- Chemically synthesized vitamin precursors
- Main job
- Supply vitamin B1
- Typical amount
- Not published
- Watch for
- Adequate thiamine in the finished food
- Not the same as
- Thiamine mononitrate
Our read // In our catalog
In 1 of every 324 foods we track
Share of foods that list it
0%
8 of the 2,595 foods with an ingredient list on file, from 3 brands. 6 dry dog food, 1 wet dog food, 1 dog food topper.
Each square is 1% of the catalog
Where it sits on the label
Median position 26.5. 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 100% of foods.
Price per lb
Median of the cheapest bag price across 5 priced foods, 48% above the catalog. The price is the food's, not the ingredient's.
Who leans on it
75%
of the foods that list it are from Farmina. 3 brands use it in total.
What it is
How it is made
Vitamin manufacturers make thiamine hydrochloride for food, feed and other uses. Chemical reactions produce a concentrated vitamin salt, which is refined and dried so manufacturers can measure it into vitamin premixes.5,6
- 01 // Source Chemical precursors A documented manufacturing route uses starting compounds including aminopropionitrile.
- 02 // Process Synthesize thiamine Controlled reactions form thiamine before conversion to its hydrochloride salt.
- 03 // Process Refine and dry The crude vitamin salt is refined, dried and inspected before packing.
- 04 // Output Crystalline powder Thiamine hydrochloride arrives as a concentrated solid for blending into a vitamin premix.
What is in it
Composition, dry matter
99.7-100
% vitamin salt
The thiamine hydrochloride assay across tested batches. This powder supplies a vitamin, with no meaningful protein, fat or fiber.
Why it is in the bag
What the manufacturer gets
-
01
Meets a vitamin requirement
Manufacturers add a measured thiamine source when the main ingredients alone cannot reliably supply enough in the finished food.4,5
-
02
Allows for processing loss
Processing reduces thiamine, so formulators account for the loss when setting the recipe's vitamin target.4
-
03
Standardizes large batches
A concentrated powder is weighed into a premix and distributed through a recipe, giving manufacturers a repeatable vitamin source at production scale.5,6
How much AAFCO lists a minimum of 2.25 mg of thiamine per kg of dry dog food; the amount of added salt depends on the recipe.4
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
Thiamine protects dogs from deficiency-related nerve disease
Evidence
- Strong
- Some
- Thin
- None
A dog with measured deficiency and neurologic signs improved after thiamine treatment and a diet change. Five dogs fed sulfite-treated meat also developed deficiency. These cases support adequate intake, not extra supplementation of healthy dogs.1,2
-
Brands say
Added B1 replaces thiamine lost during cooking
Evidence
- Strong
- Some
- Thin
- None
AAFCO warns that processing may destroy up to 90% of dietary thiamine and tells formulators to allow for that loss. Adding a measured source makes sense, but the ingredient list cannot show how much survives.4,8
-
Brands say
Thiamine hydrochloride boosts an older dog's brainpower
Outruns the evidence
Evidence
- Strong
- Some
- Thin
- None
A brand-funded trial fed 24 older dogs a blend of B vitamins, fish oil, antioxidants and arginine. It did not isolate thiamine hydrochloride, so its cognitive results cannot be credited to this ingredient.3
-
Brands say
Extra vitamin B1 gives healthy dogs more energy
Outruns the evidence
Evidence
- Strong
- Some
- Thin
- None
A brand describes thiamine as providing energy, and the vitamin participates in energy metabolism. Neither point shows an energy boost above an adequate diet; the 24-dog supplement trial tested cognition using a nutrient blend.1,3,9
-
Owners say
Synthetic thiamine hydrochloride is harmful to dogs
Outruns the evidence
Evidence
- Strong
- Some
- Thin
- None
The salt is made by chemical synthesis. An EFSA review found it safe for animals under authorized feed conditions; its handling cautions concern exposure to concentrated powder, not eating properly formulated food.5
Straight answers
What owners ask
-
Q01
Is it just filler?
NoIt supplies an essential vitamin while contributing no meaningful protein, fat or fiber. Its place near the end of a label reflects the small amount needed, not a lack of purpose.4,5,7
-
Q02
Is synthetic B1 worse?
No evidenceThiamine hydrochloride supplies vitamin B1 regardless of its synthetic origin. What matters is whether the finished food contains enough thiamine after processing.4,5
-
Q03
Does its listing guarantee enough B1?
NoAn ingredient list names what went into a recipe but does not quantify thiamine remaining in the finished food. Check the nutritional adequacy statement, and ask the manufacturer for finished-food thiamine data if needed.4,8
Who uses it
Brands, best sellers and the company it keeps
Top brands, by foods that list it
Usually listed with, share of the foods that list it
- Chicken Fat 75%
- Dehydrated Chicken 63%
- Whole Oats 63%
- Rice 50%
- Dried Beet Pulp 50%
- Flaxseed 50%
- Salmon Oil 38%
- Dehydrated Egg Product 38%
- Pork Liver 25%
- Calcium Carbonate 25%
- Sweet Potatoes 25%
- Dehydrated Fish 25%
Our read // On the bag
Read it as a vitamin safeguard
Thiamine hydrochloride near the end of an ingredient list is ordinary: it supplies a vitamin needed in small amounts. Judge the food by its nutritional adequacy statement and the main ingredients above it. The name alone cannot tell you how much B1 remains after processing.
Sources
What we read
Checked October 1, 2026.
- 1 Thiamine deficiency in a dog associated with exclusive consumption of boiled sweet potato (Ipomoea batatas): Serial changes in clinical findings, magnetic resonance imaging findings and blood lactate and thiamine concentrations
- 2 Thiamine deficiency in dogs due to the feeding of sulphite preserved meat
- 3 Cognitive enhancement in old dogs from dietary supplementation with a nutrient blend containing arginine, antioxidants, B vitamins and fish oil
- 4 AAFCO DOG FOOD NUTRIENT PROFILES
- 5 Assessment of the feed additives thiamine hydrochloride (3a820) and thiamine mononitrate (3a821) (vitamin B1) for all animal species for the renewal of their authorisation (Kaesler Nutrition GmbH)
- 6 Scientific Documentation: Thiamine Hydrochloride, USP
- 7 Product Specifications Special Chemicals: Thiamine hydrochloride
- 8 Reading Labels
- 9 Thiamine Hydrochloride in Dog Food