The supplement industry made $50 billion last year selling Americans bottles of things they couldn't pronounce, in doses they couldn't verify, with claims the FDA explicitly said it never evaluated. Most of that worked because the average buyer doesn't know how to read the label.
That's not an accident. It's the design.
The label is the product
Before anything else: the front of the bottle is marketing. The back is the product. Everything that matters — what's actually in the capsule, in what form, at what dose, made by whom, with what other ingredients — lives on the Supplement Facts panel. If a brand makes you work to find that information, that's already telling you something.
The Supplement Facts panel is FDA-mandated. Every dietary supplement sold in the US has to have one, formatted to a specific standard: bold heading, minimum 8-point font, three required zones (serving information, active ingredients with %DV, other ingredients). The regulation exists because without it, the industry's incentive is to disclose as little as legally possible.
One quick test: if the panel says "Nutrition Facts" instead of "Supplement Facts," what you're holding is legally a food, not a supplement. Different rules apply. Most protein powders and meal replacements fall into this category, which is why their labeling looks different.
Serving size is the first trick
Here's the most common scam in the industry, and it's perfectly legal: the manufacturer sets their own serving size. There's no standard.
So a magnesium bottle says "Amount per serving: 200 mg" in big numbers on the front. You buy it. You take one capsule a day. You feel nothing. You assume magnesium doesn't work for you.
What the back of the bottle actually said, in smaller print under "Suggested Use," was take three capsules daily. The real daily dose is 600 mg. Three times what you were taking. The label wasn't lying — it was structured to let you assume.
Run the math every time:
- Find "Serving Size" at the top of the Supplement Facts panel
- Find "Amount Per Serving" for the ingredient you care about
- Find "Suggested Use" — usually printed outside the panel, in smaller text
- Multiply
A bottle that looks cheaper per serving often costs more per effective dose once you do this. The math is also where you discover that a 30-day supply at one serving per day is actually a 10-day supply at the clinically studied dose.
The forms game (this is the real story)
Here's where the ancestral framing matters, and where most blog posts on this topic stop short.
The same industrial logic that swapped beef tallow for hydrogenated cottonseed oil in the early 1900s swapped bioavailable nutrient forms for cheap synthetic ones across the entire supplement industry. The forms exist because they're cheap to manufacture and shelf-stable, not because they work in your body.
A few examples worth memorizing:
Magnesium oxide vs. magnesium glycinate. Magnesium oxide has an absorption rate of around 4% in published studies. Glycinate runs roughly 5-10x higher and doesn't cause the laxative effect oxide is notorious for. Oxide is in nearly every drugstore magnesium product. Glycinate costs more to manufacture, so most brands don't use it. The number on the label says "Magnesium 500 mg" either way.
Folic acid vs. methylfolate. Folic acid is the synthetic form. Roughly 40% of the population has a genetic variant (MTHFR) that meaningfully impairs their ability to convert it to the active form their body actually uses. Methylfolate is the form that bypasses the conversion entirely. Most prenatal vitamins still use folic acid because it's cheaper.
Cyanocobalamin vs. methylcobalamin (B12). Same pattern. Cyano is the cheap synthetic. Methyl is what your body uses directly.
Hydrolyzed vs. non-hydrolyzed collagen. Hydrolyzed (collagen peptides) is broken into smaller chains your gut can actually absorb. Non-hydrolyzed gelatin has its place but isn't interchangeable.
When you look at a label, the form is in parentheses next to the ingredient name. If it's not there at all, that's a tell — quality brands name the form because the form is the value. The brands using the cheap form just list "Magnesium" and let you assume.
Units, briefly
You'll see four units across most supplements:
- mg (milligrams) — minerals, B12 at higher doses, most amino acids
- mcg (micrograms) — folate, vitamin D, selenium, B12 at standard doses
- IU (International Units) — the older measurement for fat-soluble vitamins (A, D, E), based on biological activity rather than weight
- CFU (Colony Forming Units) — probiotics, indicating live organism count
The %DV column gives you a rough benchmark — 5% is low, 20% is high, based on a 2,000-calorie reference diet. For herbal extracts, amino acids, and anything without an established daily reference, the %DV column will be blank. That's not a red flag. It just means there isn't a government number. The relevant benchmark in those cases is the clinical literature, which you have to look up separately.
"Other ingredients" is where the inventory lives
Below the main panel is the "Other ingredients" line, and it's where most people stop reading. It's also where the cheap stuff hides.
Common entries and what they actually are:
- Microcrystalline cellulose — filler, derived from wood pulp. Inert. Used to take up space in capsules.
- Magnesium stearate — flow agent that keeps manufacturing equipment running smoothly. Inert in normal amounts but contested by some researchers.
- Gelatin or hypromellose — capsule shell material. Gelatin is animal-derived; hypromellose is plant-derived.
- Titanium dioxide — whitening agent. Banned as a food additive in the EU as of 2022 over genotoxicity concerns. Still common in US supplements.
- Carnauba wax, silicon dioxide — coatings and anti-caking agents.
- Allergens to scan for — wheat, soy, milk, shellfish derivatives, often present without being highlighted.
The pattern: the more inactive ingredients on a label, the less of the bottle is actually the supplement you're paying for.
Proprietary blends: just don't
A proprietary blend lists multiple ingredients under a brand-style name ("Recovery Matrix," "Immune Defense Complex") and discloses only the total combined weight. So a 500 mg "Recovery Matrix" might contain 490 mg of cheap filler and 10 mg of the active you actually wanted, and there is no legal way for you to find out.
The industry's defense of proprietary blends is "trade secret protection." The functional purpose is to obscure dosing. There are very few cases where a fully-disclosed label isn't possible. There are many cases where a brand prefers you can't compare them on dose.
When you see a proprietary blend, assume the worst-case dose distribution. If the brand wanted you to know the ratios, they would have told you.
Certifications: useful, but not a stamp of effectiveness
Third-party seals are worth something. They're also commonly misunderstood.
What they actually verify:
- USP Verified — confirms the product contains the stated ingredients at listed amounts and is free of harmful contaminants
- NSF Certified for Sport — tests for banned substances and contaminants, used by professional athletes
- Informed Sport — batch-level testing for banned substances
- ConsumerLab — independent testing for label accuracy and purity
What they don't verify: that the dose is high enough to do anything, that the form is bioavailable, or that the product is right for you.
A USP-verified product with 50 mg of magnesium oxide is a well-tested bottle of something that won't work. The seal is necessary but not sufficient. Always verify the seal on the certifier's website directly — counterfeit logos exist, and the certifier's product database is the source of truth.
Front-label claims: ignore them
"Supports immune health." "Promotes energy." "Boosts recovery." These are structure/function claims, and they're regulated to be vague on purpose. Any product making one has to carry an FDA disclaimer somewhere on the package stating that the claim has not been evaluated by the FDA and the product is not intended to diagnose, treat, cure, or prevent any disease.
That disclaimer exists because the claim doesn't have to be substantiated the way a drug claim does. "Supports" is doing all the work. A supplement that contains 1 mg of vitamin C technically "supports immune health." So does an orange.
If a front label is doing the convincing, the back label probably can't.
How Cohld thinks about this
Most supplement brands optimize for the front of the bottle. We optimize for the back.
Every Cohld supplement uses the bioavailable form of the active ingredient — magnesium glycinate, not oxide; hydrolyzed collagen peptides, not gelatin; methylated B vitamins where the methylated form is the one your body uses. The "Other ingredients" lines are short on purpose. There are no proprietary blends in the entire line, because the whole point of a proprietary blend is to hide something, and we built the brand around having nothing to hide.
Sourcing matters as much as form. The collagen comes from grass-fed, pasture-raised cattle. The magnesium is chelated to the amino acid glycine, not bonded to oxygen for shelf life. Every product is manufactured in a GMP-compliant US facility, and every label tells you exactly what's in the bottle and in what amount.
Knowing how to read a label is only useful when the label is worth reading. That's what we're trying to build.
Browse the Cohld supplement collection
FAQ
What's the difference between Supplement Facts and Nutrition Facts panels? Supplement Facts is required by the FDA on all dietary supplements and follows different rules than Nutrition Facts. Supplements don't have to list calories unless they contribute meaningful caloric content. If you see "Nutrition Facts" on a product marketed as a supplement, it's legally classified as a food.
How do I calculate my actual daily dose? Multiply the "Amount Per Serving" by the number of servings listed under "Suggested Use." A 200 mg magnesium capsule taken three times daily delivers 600 mg total — not 200 mg. The single-serving number on the front of the bottle is almost never your actual dose.
Are proprietary blends ever okay? Rarely. The legal purpose is to protect formulation secrets. The functional purpose is to prevent you from knowing how much of each ingredient you're getting. A brand confident in its formula has no reason to hide doses behind a blend name. Treat proprietary blends as a reason to keep looking.
Do third-party certifications mean the product works? No. Seals from USP, NSF, and ConsumerLab confirm that the product contains what the label says and meets contamination standards. They don't verify that the dose is clinically effective or that the form is bioavailable. A certified product with a useless dose is still a useless product.
Why does ingredient form matter so much? Because absorption varies enormously between forms of the same nutrient. Magnesium oxide absorbs at roughly 4%, while magnesium glycinate absorbs many times better. Folic acid requires conversion that ~40% of people can't perform efficiently, while methylfolate doesn't. The number on the label is meaningless without knowing the form, and quality brands always name the form in parentheses next to the ingredient.
