Most people buy supplements off the front of the tub. Big font, bold promises, a flavor that sounds like dessert. That's marketing. The truth is on the back.
Here's how to read a supplement label in about a minute: find the Supplement Facts panel, check the serving size, look for the exact dose of every active ingredient, make sure nothing is hiding in a proprietary blend, scan the "other ingredients," and look for real third-party testing. If a product can't pass those checks, put it back on the shelf.
I've spent my career in this industry. I founded MTS Nutrition in 2011, I'm the CMO of Tiger Fitness, I'm President of Ketone Labs, and I'm a founding partner in Ambrosia Collective, so I have skin in this game and I'm telling you that up front. It's also exactly why I care about this. I've seen how labels get built, and I want you to be able to tell a good one from a bad one without needing me.
Start with the Supplement Facts panel, not the front
In the US, dietary supplements carry a Supplement Facts panel instead of the Nutrition Facts panel you see on food. That box is where the regulated information lives. The front of the package is where the hype lives.
One thing a lot of people don't realize: supplements are not approved by the FDA before they hit the market. The company is responsible for what goes in the tub and what the label says. That's why the little disclaimer, "These statements have not been evaluated by the Food and Drug Administration," shows up next to claims like "supports muscle recovery." It's legal. It also means the burden is on you to read carefully.
How to read a supplement label, step by step
Here's the order I go in every single time I pick up a product:
- Serving size and servings per container. Everything below it is based on that serving. A pre-workout that looks well dosed might be using a two-scoop serving. A "30 servings" tub might be 30 half-servings. Do the math on cost per real dose.
- Amount per serving for each ingredient. You want a number next to every active ingredient. Not just a name. A number, in grams or milligrams.
- Compare those amounts to what the research actually uses. An ingredient at a fraction of an effective dose is there so it can be printed on the front. That's called label dressing.
- Look for proprietary blends. If you see a "matrix," "complex," or "blend" with one total weight and a list of ingredients under it, you don't know how much of each you're getting.
- Read the "other ingredients." Fillers, flavors, sweeteners, colors, and sometimes allergens. Make sure nothing there is a problem for you.
- Check for third-party testing. A real seal from an independent program means someone outside the company checked the product.
Proprietary blends: why I won't use them
Here's how a proprietary blend works. The company has to list the total weight of the blend and the ingredients in it, in descending order by weight. They do not have to tell you how much of each ingredient is in there.
So a 6-gram "performance matrix" could be almost entirely the cheapest ingredient on the list, with a sprinkle of the expensive one that's actually studied. You can't tell. That's the whole point of hiding it.
When I started MTS, no proprietary blends was a non-negotiable. If an ingredient is in the product, the dose is on the label. If a company is proud of its formula, it shows you the formula. If it hides it, ask yourself why.
Fair is fair: not every blend is a scam, and some companies use them to protect a formula. But as a buyer, you're paying for something you can't verify. I'd rather spend my money where I can see exactly what I'm getting.
Protein powder labels: what to check
Protein is where reading the label pays off the most, because it's a supplement a lot of people use every day.
- Protein per scoop vs. scoop size. If a 35-gram scoop gives you 25 grams of protein, the other 10 grams are carbs, fat, flavor and everything else. Fine, just know it.
- Protein source. Whey isolate, whey concentrate, casein, egg, plant blends. The source should be named clearly.
- Added free-form amino acids. Some products add cheap individual amino acids like glycine or taurine to inflate the protein number on the label. This is commonly called amino spiking. If you see those in the ingredients of a protein powder, look harder at the amino acid profile, if the company even provides one.
- Testing. Third-party verification that the protein claim on the label matches what's in the tub.
And remember, a shake doesn't replace food. Supplements supplement. They don't substitute. If your diet isn't built around protein at every meal and real portions, no powder fixes that. I wrote about the bigger problem in why intuitive eating fails in a processed-food world.
Third-party testing and supplement label claims
A company testing its own product is a start. An independent lab checking it is better. Look for programs like NSF Certified for Sport, Informed Sport, or USP Verified, and make sure the seal is real by checking the product on that program's own website. Some brands also publish certificates of analysis from outside labs for each batch.
If you're a tested athlete, this matters even more. Banned-substance screening programs are how you protect yourself from a contaminated product you never meant to take.
At MTS we've built the brand around third-party verified label claims. That's the standard I'd want from anyone I buy from, mine or not.
Red flags on a supplement label
- No amount listed next to active ingredients.
- Huge claims on the front, tiny doses on the back.
- Words like "clinically proven" with no study, dose or source behind them.
- A serving size that quietly doubles to make the numbers look good.
- Ingredient names you can't find or verify anywhere.
- Promises that sound like a drug: cures, treats, "melts fat."
And if you're on medication, pregnant, or managing a health condition, talk to your doctor before you add a supplement. A clean label doesn't make something right for you.
Quick answers
Are proprietary blends bad?
They aren't automatically dangerous, but you can't tell how much of each ingredient you're getting. I'd buy fully disclosed products instead.
Does FDA approve supplements?
No. Supplements don't get FDA approval before they're sold. The manufacturer is responsible for safety and label accuracy, which is why independent testing matters.
What's the most important part of a supplement label?
The amount per serving for each active ingredient. If you can't see the dose, you can't judge the product.
The label won't do the work for you
Reading labels keeps you from wasting money. It won't build muscle or strip fat. Training hard, eating with intent, and staying consistent does that. If you want someone who looks at your daily weigh-ins and weekly photos personally, that's what I do with every client, 1-on-1, no assistants. See coaching plans.
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