Supplement labels are designed to sell. The front panel uses bold claims and curated language. The back panel — the Supplement Facts box — is where the data lives. Learning to read it critically takes five minutes and saves you from products that look good on the shelf but deliver nothing in practice.
Serving Size vs. Container Size
This is the oldest trick. A product advertises “60 capsules” on the front, but the serving size is 2 capsules. That’s 30 servings, not 60. Compare price per serving, not price per container. A $25 bottle with 30 servings costs $0.83/day. A $40 bottle with 90 servings costs $0.44/day. The more expensive bottle is the better deal.
Proprietary Blends: What They Hide
A proprietary blend lists ingredients in order of weight but doesn’t disclose individual amounts — only the total weight of the blend. A “Focus Blend 500mg” containing L-theanine, alpha-GPC, and bacopa could be 490mg of the cheapest ingredient and 5mg each of the others. Without individual doses, you can’t verify whether the product contains clinically studied amounts of anything.
The FDA requires total blend weight and ingredient listing in descending order by weight. But “descending order” with three ingredients and 500mg total could mean 498/1/1 or 170/165/165. You have no way to know. Reputable brands disclose individual doses. Products that hide behind proprietary blends are usually hiding underdosing.
% Daily Value: Context Matters
The % Daily Value (DV) is based on a 2,000-calorie diet for the general population. It’s a reference point, not a target. For minerals like magnesium (DV: 420mg) or potassium (DV: 4,700mg), the DV is often higher than what most supplements provide. A magnesium supplement at 100mg is 24% DV — not necessarily underdosed, but worth noting relative to how much your diet already provides.
For vitamins like B12 (DV: 2.4mcg) or vitamin D (DV: 20mcg/800IU), supplements often provide 1,000–5,000% of the DV. This isn’t dangerous for water-soluble vitamins (excess is excreted), but it also doesn’t mean more is better. Fat-soluble vitamins (A, D, E, K) accumulate and can reach toxic levels at sustained high doses.
Forms of Ingredients
The form of an ingredient affects absorption and efficacy. Magnesium oxide has about 4% bioavailability. Magnesium glycinate has roughly 80%. Both can legally be listed as “magnesium” on the front of the bottle. The Supplement Facts panel should specify the form — if it doesn’t, assume the cheapest one.
Curcumin without a bioavailability enhancer (piperine, phytosome, or micellar technology) has less than 1% absorption. Vitamin D as D3 (cholecalciferol) is more effective than D2 (ergocalciferol). Folate as L-methylfolate is directly usable, while folic acid requires enzymatic conversion that some people (those with MTHFR variants) can’t perform efficiently.
Other Ingredients: The Fine Print
Below the Supplement Facts box is the “Other Ingredients” list. This is where fillers, binders, flow agents, colorings, and coatings are disclosed. Common entries: magnesium stearate (lubricant, generally harmless), silicon dioxide (anti-caking), cellulose (capsule material), and titanium dioxide (colorant, increasingly avoided). None of these are dangerous at supplement doses, but some people prefer cleaner formulations with fewer additives.
What to watch for: artificial colors (Red 40, Yellow 5), artificial sweeteners in gummies (sucralose, acesulfame K), and soy/dairy/gluten allergens that may be listed in a “contains” statement below the ingredients.
The Bottom Line
A good label discloses individual ingredient amounts (no proprietary blends), names the specific form of each ingredient, lists the serving size prominently, provides transparent “other ingredients,” and includes the manufacturer’s name and contact information. If a label doesn’t do these things, the product may still be fine — but you’re trusting the brand without data. At Topgun Goods, every product we stock meets these transparency standards.