What "Proprietary Blend" Actually Means on a Dog Supplement (And Why We Don't Use One)

By Jack Garner, founder of Trovara

Bottom line up front: A "proprietary blend" on a dog supplement label is a group of ingredients listed together under one combined weight, without disclosing how much of each individual ingredient is present. It's legal, and it's common — but it means you can't tell whether a supplement contains a meaningful amount of a key ingredient or just a trace. Companies use proprietary blends for two main reasons: to protect their formula from competitors, and, in some cases, to hide low doses of expensive ingredients. There's a simple alternative: publishing every ingredient's exact milligram dose on the label.

If you've ever flipped a dog supplement jar around to read the ingredients, you may have run into a phrase that sounds official but quietly tells you very little: proprietary blend.

It shows up constantly in the pet supplement world. And most dog owners have no idea what it actually means for what they're feeding their dog. Here's a plain-English explanation — and an honest account of why we made the deliberate choice not to use one.

What a proprietary blend actually is

A proprietary blend is a list of ingredients grouped together and given a single combined weight, instead of an individual amount for each ingredient.

Here's the difference, side by side:

Both labels might list the same ingredients. But only the first one tells you how much of each your dog is actually getting.

With a proprietary blend, that 750mg could be 700mg of the cheapest ingredient and a sprinkle of everything else — and you'd never know. The individual amounts are, by design, hidden.

Is a proprietary blend legal? Yes.

To be clear: proprietary blends are completely legal. Supplement labels are allowed to disclose a combined blend weight rather than individual amounts. So a company using one isn't breaking any rules.

But "legal" and "transparent" aren't the same thing. A proprietary blend is legal and it withholds information you'd reasonably want as someone deciding what to give your dog every day.

Why companies use them

There are two honest reasons, and it's worth separating them:

1. To protect the formula. This is the legitimate reason. A company may not want competitors to be able to copy its exact recipe by reading the label. This is a real business concern.
2. To obscure low doses. This is the less flattering reason. Some ingredients — particularly the effective, research-backed ones — are expensive. A proprietary blend lets a company list an impressive-sounding ingredient while including only a tiny, inexpensive amount of it. The ingredient appears on the label; the meaningful dose does not.

The problem is that from the outside, you can't tell which reason a given company has. A proprietary blend that's protecting a genuinely great formula looks identical to one that's hiding a weak one. That ambiguity is the whole issue.

Why doses matter for joint supplements specifically

For joint-support ingredients, amount matters. An ingredient present in a token amount may not do much of anything. So when a label hides the individual doses, it's hiding one of the most important pieces of information about whether the product is likely to support your dog's joints in any meaningful way.

This is exactly why dose transparency is the first thing many veterinarians and informed owners look for. If you can see the numbers, you can evaluate the product. If you can't, you're trusting a marketing phrase.

(A necessary note: supplements support normal joint health and mobility — they are not medications and are not intended to diagnose, treat, cure, or prevent disease. If your dog is in pain or has a diagnosed condition, that's a conversation for your veterinarian.)

The alternative: just show the numbers

The alternative to a proprietary blend is simple. Publish every active ingredient and its exact milligram dose, right on the label.

That's the choice we made at Trovara. Our hip & joint soft chews list all nine active ingredients and the precise amount of each, per serving — no blend, no hidden numbers. We did it because when we were shopping for our own senior dog, the proprietary-blend labels were the single most frustrating part of the whole process. We couldn't tell the good products from the padded ones.

Does this mean a competitor could read our label and see our formula? Yes. We decided that being able to look our customers in the eye and say "here's exactly what's in it" was worth more than keeping the recipe secret. When you love your dog, you deserve to know exactly what you're giving them.

How to check any supplement yourself

You don't have to take anyone's word for it. Next time you're evaluating a dog supplement — ours or anyone else's — do this:

1. Find the supplement facts panel (on the jar or product page).
2. Look for individual milligram amounts next to each active ingredient.
3. If you see "proprietary blend" with one combined number, know that the individual doses are being withheld.
4. Decide whether you're comfortable not knowing how much of each ingredient your dog is getting.

There's no single right answer for every buyer. But you should at least know what the label is — and isn't — telling you.

Frequently asked questions

What does "proprietary blend" mean on a dog supplement?
It means the product lists a group of ingredients under one combined weight without disclosing the individual amount of each ingredient. You can see what's in it, but not how much of each.

Is a proprietary blend bad or dangerous?
Not inherently, and it's legal. But it hides the individual doses, which are important for evaluating whether a supplement is meaningfully formulated. The concern is that a proprietary blend can conceal very low amounts of key ingredients.

Why don't all companies just publish their doses?
Some want to protect their formula from competitors — a legitimate reason. Others use blends to obscure low doses of expensive ingredients. From the outside, the two look identical, which is the core problem.

How can I find a dog supplement that shows its doses?
Look for a supplement facts panel that lists each active ingredient with its own milligram amount, rather than a combined "blend" figure. A company confident in its formula generally has no reason to hide the numbers.

Why we wrote this: transparency is the entire reason Trovara exists. I started the company after getting frustrated trying to find an honest joint supplement for my own aging dog. That's why we publish every dose on the label — so you never have to wonder what "proprietary blend" is hiding. — Jack

This article is for general educational purposes and is not a substitute for veterinary advice. Always consult your veterinarian before starting your dog on a new supplement.