The supplement facts panel is the standardised section of a supplement label that the FDA requires manufacturers to include. It is the one part of the label that is regulated — everything else, including the claims on the front, the brand name, and the product description, is marketing. The supplement facts panel is where the product actually lives.
Most people glance at it. The people who get the most from their supplement spending read it properly. The difference is knowing what each element means — and knowing what manufacturers do with the elements they're allowed to control.
The Structure of a Supplement Facts Panel
The panel follows a defined format. Understanding each component gives you a complete picture of what you're buying.
Serving Size and Servings Per Container
The first line of the panel declares the serving size — the quantity of the product that constitutes one dose. The second line declares how many servings are in the container.
This pairing is where the first manipulation opportunity exists. A 60-serving container at $40 appears to cost $0.67 per serving. If the formula requires two servings to deliver a functional dose — which the manufacturer may know when designing the product — the effective cost is $1.34 per serving and the container lasts 30 days rather than 60.
The serving size also determines every ingredient quantity on the rest of the panel. An ingredient listed at 300mg per serving at a two-scoop serving size contains 150mg per actual scoop. If the instructions suggest starting with one scoop, the functional ingredient dose may be half of what the label suggests.
Check serving size first, and check whether the product is designed for single or multiple servings per dose.
The Ingredient List: What Each Column Means
Each ingredient on the supplement facts panel lists three pieces of information: the ingredient name, the amount per serving, and the percent daily value (%DV) if one has been established.
The ingredient name should include both the common name and, where relevant, the specific form. "Magnesium" alone is insufficient — the form (bisglycinate, oxide, citrate) determines bioavailability. "Ashwagandha" alone is insufficient — root extract versus whole herb versus leaf extract determines pharmacological profile. A label that lists ingredients without specifying forms is omitting information that affects how the product works.
The amount per serving is given in milligrams (mg), micrograms (mcg), or grams (g) for most ingredients. This number requires context to evaluate — it means nothing without knowing whether the form is bioavailable, whether the dose is in the range where the mechanism operates, and whether the amount refers to the compound weight or the elemental weight of the active component.
The %DV reflects what percentage of the FDA-established daily value for that nutrient a serving provides. Daily values are established for macronutrients and most vitamins and minerals, but not for many botanical ingredients or novel compounds. An asterisk (*) in the %DV column with a footnote indicating "Daily Value not established" is normal for many supplement ingredients — it does not indicate a problem.
The Compound vs Elemental Weight Problem
This is the most consistently misunderstood element of supplement label reading, and it is the source of some of the most misleading label presentations in the market.
Minerals in supplements are always bound to a companion compound — a salt or chelate that stabilises the mineral and enables absorption. Magnesium bisglycinate is magnesium bound to two glycine molecules. The supplement facts panel may list either the compound weight (the total weight of the magnesium-glycine complex) or the elemental weight (the weight of the magnesium alone).
The difference is significant. Magnesium bisglycinate is approximately 14% elemental magnesium by weight — meaning that 2,000mg of magnesium bisglycinate contains approximately 280mg of elemental magnesium. A product that lists "Magnesium (as magnesium bisglycinate) 280mg" is declaring the elemental amount. A product that lists "Magnesium bisglycinate 2,000mg" is declaring the compound weight, which produces a much larger number on the label without representing more magnesium.
A smaller number representing elemental magnesium is not necessarily inferior to a larger number representing compound weight — it depends entirely on which is being declared. Both can be legitimate. The potential for confusion — and exploitation of that confusion — is significant when comparing products that use different conventions.
The FDA requires that if the label expresses the mineral content, it should reflect the elemental amount. But "magnesium bisglycinate" is listed as a compound, not a mineral — so the compound weight convention is used by many manufacturers because the larger number looks more impressive.
Research from the Office of Dietary Supplements at the National Institutes of Health has documented the confusion this creates for consumers attempting to compare supplement potencies across products — finding that the lack of standardisation in how mineral compounds are declared makes direct comparison unreliable without understanding the underlying chemistry.
Red Flags on the Supplement Facts Panel
Proprietary Blends
A proprietary blend lists a group of ingredients under a single collective name with a total weight for the blend but no individual ingredient amounts. Legally permitted. Evaluatively useless.
Without individual amounts, you cannot determine whether any ingredient in the blend is present at a dose where its mechanism operates. A blend containing KSM-66® ashwagandha at 10mg is functionally equivalent to a blend containing no ashwagandha — but both would appear on the label as containing KSM-66®.
Any product with a proprietary blend that includes ingredients you are specifically purchasing for their mechanisms should be treated with scepticism. The mechanism depends on the dose. The dose is not declared.
Implausible Serving Counts
A 30-day supply at two capsules per day requires 60 capsules. A product marketed as a 30-day supply in a 30-capsule bottle at two capsules per day is either a 15-day supply or requires an undeclared two-bottle monthly purchase. Check the maths: servings per container multiplied by the number of days in a month at the recommended serving frequency should equal approximately 30 for a monthly supply.
Ingredients Present Without Disclosed Form
An ingredient listed without its form — "magnesium," "ashwagandha extract," "probiotic blend" — provides insufficient information to evaluate. Magnesium is a category with absorption rates ranging from 4% to over 80% depending on form. Ashwagandha extract is a category ranging from unspecified whole-herb preparations to standardised root extracts. "Probiotic blend" without named strains is unevaluable.
The absence of form information is not necessarily deceptive — some manufacturers use it without intending to mislead — but it prevents meaningful evaluation and should prompt further investigation before purchase.
A %DV That Looks Impressive But Doesn't Reflect Functional Dosing
Some ingredients have established daily values that are significantly lower than the doses used in clinical research. A product listing 100% DV of magnesium may contain 420mg of elemental magnesium — the RDA for adult males — but deliver only a fraction of that as actual magnesium to tissues if the form is magnesium oxide at 4% absorption.
The %DV reflects the declared amount, not the bioavailable amount. A 100% DV figure from a poorly absorbed form delivers less functional magnesium than a 60% DV figure from a well-absorbed chelated form.
Serving Size Designed to Inflate Per-Serving Numbers
A product with a 10g serving size will show ingredient amounts that look large compared to a product with a 5g serving size, even if the functional ingredient concentration is identical. Fillers, bulking agents, and inert carbohydrates inflate serving size and therefore inflate the mg numbers on the supplement facts panel without adding anything to the formula's efficacy.
What a Well-Structured Panel Looks Like
A transparent, evaluable supplement facts panel discloses individual ingredient amounts for every active ingredient, specifies the form of each ingredient by name, uses elemental declarations for minerals with a parenthetical noting the compound source, and does not use proprietary blends to conceal functional ingredient doses.
The other ingredients section lists only what is necessary for the formula to function — flow agents, flavourings, sweeteners — without artificial colours, unnecessary preservatives, or additives with no functional role.
Moongreens discloses all ingredients individually, specifies Albion® magnesium bisglycinate, KSM-66® ashwagandha, ProbioSEB®, Fibruline®, and BioPerine® by name and trademark, and does not use proprietary blends. The panel reads the way a transparent formula should read — every line evaluable against the criteria above.
The Practical Takeaway
Reading a supplement facts panel properly takes three minutes and produces more useful information than any product review, influencer recommendation, or front-of-label claim. The skills required are: understanding the serving size maths, recognising compound versus elemental weight declarations, identifying proprietary blends and what they conceal, and knowing what form information to look for alongside ingredient names.
These are not advanced analytical skills. They are basic consumer literacy that the supplement industry has little incentive to teach because the gaps in consumer knowledge benefit manufacturers who are exploiting them.
The panel tells you what the product is. The rest of the label tells you what the manufacturer wants you to think it is.
Every supplement looks impressive on the front. Turn it over.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.