bht
BHT is a synthetic antioxidant closely related to BHA, used to preserve fats in pet food. Here is how it works and how Bowlmark scores it.
Also appears on labels as: butylated hydroxytoluene · bht (a preservative) · e321
What it is
Butylated hydroxytoluene (BHT) is a synthetic antioxidant closely related to BHA, listed on labels as BHT, butylated hydroxytoluene, or E321. It protects fats and oils from oxidation and shares BHA's rodent-study safety questions, which is why the two are usually discussed — and scored — together.
Why it's in pet food
Like BHA, it is an inexpensive and effective way to keep kibble fat from going rancid over a long shelf life. Formulas built for a premium audience generally use mixed tocopherols or rosemary extract instead.
How Bowlmark scores it
Scores are deterministic math over the printed label — the rules below apply to every product identically, and nothing estimates or fills in a blank.
BHA and BHT are scored as one class: the additive pillar deducts 35 points when either appears on the label, shown as a warning flag. A label listing both takes a single 35-point deduction, not two.
Common questions
Answers come from this entry and the scoring rules above — reviewed before publish, like everything else on this page. For anything about your own pet, your vet knows best.
Is BHT safe in pet food?
BHT is closely related to BHA and shares its rodent-study safety questions, which is why the two are usually discussed — and scored — together. The preservation job is real; formulas built for a premium audience generally do it with mixed tocopherols or rosemary extract instead.
Does a label with both BHA and BHT lose double points?
No — BHA and BHT are scored as one class: the additive pillar deducts 35 points when either appears, shown as a warning flag, and a label listing both takes a single 35-point deduction, not two.
Why is BHT still used in some pet foods?
It is an inexpensive and effective way to keep kibble fat from going rancid over a long shelf life — which is why it persists in some budget formulas even as premium brands have moved to natural preservation systems.
Foods that list bht
No food on the shelf lists bht yet. Scan a bag that does and its label joins the catalog — versioned from the day it arrives.
Sources
Related ingredients
Further reading
Cite this page
Bowlmark. "Bht in pet food — what it is and how it scores." https://www.bowlmark.com/ingredient/bht
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- Last verified August 21, 2026
No stored score to stamp yet — the engine and config above are the ones a scan runs today.