The supplement industry is largely self-regulated. That means the label on a product is often the only information you have to evaluate whether it’s worth taking — and most labels are designed to impress, not inform.
Learning to read a supplement label critically is one of the highest-leverage skills you can develop as a consumer. This guide walks you through every section of a supplement label, what to look for, and the red flags that should make you put the product back on the shelf.
1. Start with the Serving Size
The serving size is the foundation of everything else on the label. Every ingredient amount listed in the Supplement Facts panel is based on one serving — so if the serving size is two capsules but you’re only taking one, you’re getting half the dose of everything.
Watch for serving sizes that are unrealistically large. Some companies list impressive ingredient amounts per serving but make the serving size four or six capsules — knowing most people won’t take that many. Check the serving size first, then evaluate the doses in that context.
2. Evaluate Each Ingredient Dose Against the Research
This is the most important step — and the one most people skip.
Every ingredient in a supplement has a dose range that research has shown to be effective. If a product contains an ingredient at a fraction of that dose, it’s there for label decoration, not efficacy. This practice is called pixie dusting — including an ingredient at a dose too low to do anything meaningful, purely so it can appear on the label.
A few benchmarks to know:
- Creatine monohydrate: 3–5g per day is the research-supported dose. A product with 500mg of creatine is pixie dusted.
- Ashwagandha (KSM-66 or Sensoril): 300–600mg per day. Less than 200mg is unlikely to be meaningful.
- Lion’s Mane: 500–1,000mg of a standardized extract. An unstandardized 100mg inclusion is not a Lion’s Mane supplement.
- Beta-glucans (mushrooms): The product should disclose the actual beta-glucan content — not just the mushroom extract weight.
- L-Glutamine: 5g per day for gut and recovery support. Less than 2g is underdosed.
If you’re unsure what the research-supported dose is for an ingredient, a quick search for “[ingredient] clinical dose” will give you a reliable benchmark.
3. Watch for Proprietary Blends
A proprietary blend is a group of ingredients listed together under a single total weight, without disclosing the individual amounts of each ingredient. You’ll see it labeled as something like “Performance Matrix — 2,500mg” followed by a list of ingredients.
The problem: you have no idea how much of each ingredient you’re actually getting. The blend could be 2,400mg of the cheapest ingredient and 100mg split across everything else. You cannot evaluate a proprietary blend for efficacy — which is exactly why some companies use them.
Red flag: Any product that hides ingredient doses behind a proprietary blend is not giving you the information you need to make an informed decision. Full label transparency — every ingredient with its individual dose disclosed — is the standard you should hold supplements to.
Iron & Ivory uses no proprietary blends. Every ingredient, every dose, disclosed.
4. Check for Standardization
For botanical and mushroom extracts, standardization is a critical quality marker. Standardization means the extract has been processed to guarantee a minimum concentration of the active compounds responsible for the benefit.
For example:
- “Ashwagandha root extract (KSM-66, standardized to 5% withanolides)” tells you the active compound concentration is guaranteed
- “Ashwagandha root powder” tells you nothing about potency — it could be ground-up root with minimal active compounds
The same applies to mushroom supplements. “Chaga extract, standardized to 40% polysaccharides” is a meaningful quality claim. “Chaga mushroom powder” is not.
Always look for standardization information on botanical and mushroom products. If it’s not there, the potency is unknown.
5. Identify the “Other Ingredients”
Below the Supplement Facts panel, you’ll find the “Other Ingredients” list — the fillers, binders, flow agents, coatings, and additives used in manufacturing. Most are benign, but some are worth avoiding:
Ingredients to be cautious of:
- Magnesium stearate — a common flow agent, generally considered safe but some research suggests it may reduce absorption of certain nutrients at high levels. Widely used and not a major concern in small amounts.
- Silicon dioxide — another flow agent, generally safe in small amounts
- Artificial colors and dyes — no functional purpose; a sign of a product optimizing for appearance over quality
- Artificial sweeteners (sucralose, acesulfame-K) — common in powders and gummies; some research suggests negative effects on gut microbiome with regular use. Stevia is a cleaner alternative.
- Hydrogenated oils — a red flag in any supplement; no reason for these to be present
- Titanium dioxide — used as a whitening agent; the EU has banned it as a food additive due to safety concerns
What clean “Other Ingredients” looks like: vegetable capsule (hypromellose), rice flour, silica. Short list, recognizable ingredients, no artificial additives.
6. Verify Third-Party Testing Claims
The FDA does not approve dietary supplements before they go to market. This means a company can put almost anything on a label without pre-market verification. Third-party testing is the mechanism that provides independent verification that:
- The product contains what the label says it contains
- It doesn’t contain what the label says it doesn’t contain
- It’s free from contaminants (heavy metals, pesticides, microbes)
Look for certifications from recognized third-party testing organizations. The claim “third-party tested” without specifying the organization is not verifiable — any company can make that claim. Reputable brands will name the testing organization and ideally provide access to the certificates of analysis (COAs).
7. Evaluate the Form of Each Ingredient
Not all forms of an ingredient are equally bioavailable. The form matters — sometimes significantly.
Examples:
- Magnesium glycinate vs. magnesium oxide — glycinate is far better absorbed; oxide has poor bioavailability and is primarily used as a laxative
- Vitamin K2 (MK-7) vs. Vitamin K1 — MK-7 has significantly longer half-life and better tissue distribution for cardiovascular and bone health
- Folate (methylfolate) vs. folic acid — methylfolate is the active form; a significant portion of the population has reduced ability to convert folic acid
- Creatine monohydrate vs. creatine HCl or Kre-Alkalyn — monohydrate has the most research; the alternatives offer no proven advantage and cost more
When evaluating a supplement, look up the specific form of each key ingredient and check whether it’s the research-supported form or a cheaper, less bioavailable alternative.
8. Be Skeptical of Structure/Function Claims
Supplement labels in the US are permitted to make “structure/function claims” — statements about how a nutrient affects the structure or function of the body. These do not require FDA approval and are not the same as drug claims.
Examples of structure/function claims:
- “Supports immune health”
- “Promotes healthy energy levels”
- “Helps maintain muscle mass”
These claims are legal and common — but they’re not evidence of efficacy. A product can make these claims regardless of whether the ingredients are dosed effectively. Evaluate the ingredients and doses independently of the marketing language on the label.
The Iron & Ivory Standard
Every Iron & Ivory product is built around the principles in this guide:
- No proprietary blends — every ingredient, every dose, fully disclosed
- Clinically dosed ingredients — doses matched to what the research actually supports
- Standardized extracts — potency guaranteed, not assumed
- Clean “Other Ingredients” — no artificial colors, no unnecessary additives
- Third-party tested — independent verification of label accuracy and purity
Browse the full catalog at ironandivory.net — every label, every dose, nothing hidden.
Quick Reference: Supplement Label Red Flags
- 🚩 Proprietary blends — individual doses hidden
- 🚩 No standardization information on botanical/mushroom extracts
- 🚩 Doses significantly below research-supported levels (pixie dusting)
- 🚩 Artificial colors, dyes, or titanium dioxide in “Other Ingredients”
- 🚩 “Third-party tested” with no named testing organization
- 🚩 Serving size that requires 4+ capsules to achieve listed doses
- 🚩 Ingredient forms with poor bioavailability (magnesium oxide, folic acid)
- 🚩 No lot number or expiration date on the label
Frequently Asked Questions
Are supplements regulated by the FDA?
Dietary supplements are regulated by the FDA under DSHEA (Dietary Supplement Health and Education Act of 1994), but not in the same way as drugs. Supplements do not require FDA approval before going to market. The FDA can take action against unsafe products after they’re on the market, but pre-market review is not required. This is why third-party testing and label transparency matter so much.
What does “clinically dosed” mean?
A clinically dosed supplement contains each ingredient at the dose used in clinical research that demonstrated the benefit. It’s the opposite of pixie dusting — every ingredient is present at a meaningful, research-supported amount.
How do I know if a supplement is third-party tested?
Look for a certification seal from a recognized testing organization on the label or the brand’s website. Reputable brands will name the organization and ideally provide access to certificates of analysis (COAs) for each product lot.
Is a longer ingredient list better?
No — often the opposite. A longer ingredient list in a fixed-size product usually means each ingredient is more diluted. A focused formula with fewer, well-dosed ingredients is typically more effective than a kitchen-sink formula with 20 underdosed ingredients.
What’s the difference between an extract and a powder?
An extract has been processed to concentrate specific active compounds. A powder is typically ground-up raw material with variable and unguaranteed potency. For botanicals and mushrooms, standardized extracts are almost always preferable to raw powders.