Ingredient database › Menadione (Vitamin K3)
Is Menadione (Vitamin K3) good or bad in dog food?
Menadione (Vitamin K3) is an additive and rates as Watch in our analysis.
Watch Bottom line: Menadione (Vitamin K3) is controversial — not toxic, but it adds little and is best avoided, especially near the top of the list.
Synthetic vitamin K banned in some human uses; debated in pet food.
This is a controversial ingredient. It isn't necessarily harmful, but many dog owners prefer to avoid it, especially when it appears among the first few ingredients.
Built on AAFCO & FDA pet-food criteria · Last updated June 2026 · How we rate
What is Menadione (Vitamin K3)?
Menadione (Vitamin K3) is an additive used in dog food. On a label it may also appear as: menadione, menadione sodium bisulfite, vitamin k3, menadione sodium bisulfite complex.
What to look for on the label
Ingredients are listed by weight, so the ones near the top make up most of the recipe. Menadione (Vitamin K3) is best seen low on the list — or not at all. The fastest way to judge a whole product is to paste its full ingredient list into our free dog food checker, which grades it A–F and flags every ingredient like this one.
How Menadione (Vitamin K3) affects the WoofScore
Our grade rewards named whole proteins, vegetables, fruit and beneficial supplements, and penalises vague by-products, cheap fillers, artificial colours and controversial preservatives. Menadione (Vitamin K3) contributes as a watch-tier item; read the full scoring methodology to see exactly how the grade is calculated.