Reading Supplement Labels
How to read the Supplement Facts panel on an adaptogen product: plant part, extract weight, serving size, blends and claims, and what a label cannot tell you.
Content last updated . This page has not been medically reviewed.
Safety first. Supplements can cause side effects and interact with medicines. Read mushroom safety and interactions before you use any mushroom product.
A supplement label tells you what the maker chose to say, in a format set by US rules. It is useful for spotting the plant part, the serving size and whether amounts are hidden in a blend. It is not proof of what is inside the bottle, or of any benefit. This page uses FDA's labeling rules and published product studies; the general guide is Reading supplement labels.
In the US, the FDA does not approve dietary supplements for safety and effectiveness, or approve their labeling, before they are sold. [1] Companies are responsible for meeting the safety standards. [1]
Start with the Supplement Facts panel
| Label item | What the FDA guide says | What it means for adaptogens |
|---|---|---|
| Serving size | One serving equals the maximum amount recommended on the label per eating occasion; if the label says 1-3 tablets, the serving size is 3 tablets. [2] | Check whether the numbers are per capsule or per serving. |
| Plant part | The part of the plant a dietary ingredient comes from must be in the panel. [2] | Root, leaf and berry products are not interchangeable. NIH notes ashwagandha supplements typically contain root, leaf, or root and leaf extracts. [3] |
| Dried extract | The weight of the dried extract is listed. [2] | The weight is the extract, not the plant it came from. See extract ratios. |
| Liquid extract | The volume or weight of the total extract, plus the solvent, in the panel or ingredient list. [2] | Applies to tinctures and liquid extracts. |
| Marker compounds | A maker may list constituents, with amounts per serving, indented under the ingredient. [2] | Trials often report markers (for example withanolides or ginsenosides); see standardization markers. |
| Proprietary blend | The blend's total weight is shown, with ingredients listed in descending order of weight. [2] | Individual amounts are hidden. See proprietary blends. |
The ingredient list and "Other Ingredients"
The guide says a product with no excipients or fillers beyond what is in the panel does not need a separate ingredient statement, and that the heading reads "Other Ingredients" when some ingredients (as sources) have already been identified in the panel. [4] So fillers and carriers show up in this second list. If you have an allergy or avoid an ingredient, read both places.Names and plant parts
A common name can cover more than one plant. A 2020 study notes that Panax ginseng and Panax quinquefolius have similar active components and look alike, but are known to have different medicinal values. [5] Look for the scientific name (genus and species) and the plant part. A 2026 laboratory study of 25 ashwagandha (Withania somnifera) supplements found only two confirmed as root-derived, while the rest contained varying proportions of leaf or other aerial parts that were not always disclosed. [6] This is a small study of one ingredient, but it shows why the plant part matters. See Roots, leaves, berries and other plant parts."Standardized," "verified" and "certified"
NIH says that a manufacturer's use of the term "standardized" (or "verified" or "certified") does not necessarily guarantee product quality or consistency. [7] Ask what was standardized (for example, to which marker, at what percentage) and who checked it. See Independent testing and certificates of analysis.Claims and the FDA disclaimer
Structure/function claims on supplements (such as "supports a healthy stress response") must carry a disclaimer: "This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease." [8] That means the claim has not been reviewed by the FDA. See claims on labels.How well do labels match what is inside?
Studies that tested products are mixed and small, and they do not cover all brands or all adaptogens:- In a 2004 analysis of ginseng and four other botanicals from nine manufacturers, labels varied in whether they gave the species, plant part or marker compound, and total ginsenosides in ginseng ranged from 5.3 to 18.2 mg per serving. [9]
- In a 2025 analysis of 13 products claiming to contain Rhodiola rosea, nearly 60% did not contain the declared amount of root and rhizome or the characteristic marker compounds. [10]
- In the 2026 ashwagandha study, only 10 of 25 products met both British and US pharmacopoeia standards for the markers measured. [6]
Details and limits are on the contamination, substitution and adulteration page.
Frequently asked questions
Does a "Supplement Facts" panel prove what is in the product?
No. The panel is the maker's declaration. The FDA does not approve supplement labeling before sale, and studies of products found mismatches in some cases. [1][10]
Where do I find the plant part?
In the Supplement Facts panel. The FDA guide says the plant part must be included for a plant-derived dietary ingredient. [2]
What does "Daily Value not established" mean beside an herb?
The FDA guide says blend ingredients are followed by a symbol that refers to the footnote "Daily Value Not Established." In plain terms, no Daily Value benchmark is set for the ingredient. [2]
Does "standardized" mean the product is high quality?
Not necessarily. NIH says the term does not necessarily guarantee quality or consistency. [7]
Should I trust the claims on the front of the bottle?
Treat them as marketing until you check the evidence for that specific extract. Claims carry an FDA disclaimer that they have not been evaluated by the agency. [8]
More details: evidence, limits and cautions
The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.
Safety: ask before you buy
- Supplements may interact with medicines or pose risks if you have certain medical conditions or are going to have surgery. [7] Tell the surgical team about every supplement, well ahead of the operation. [7]
- Many supplements have not been tested in pregnant women, nursing mothers or children. [7]
- Products promoted mainly for weight loss, sexual enhancement and bodybuilding may contain prescription drugs not allowed in supplements, or ingredients not on the label. [7]
- Ask a pharmacist or clinician to check the label against your medicines. See how interactions work and adaptogen safety. A clinician or pharmacist decides what is right for a person; this page does not give amounts.
References
- FDA, FDA 101: Dietary Supplements (consumer update). Read 2026-10-22.
- FDA, Dietary Supplement Labeling Guide, Chapter IV: Nutrition Labeling (page content dated 2005). Read 2026-10-22.
- NCCIH, Ashwagandha. Read 2026-10-22.
- FDA, Dietary Supplement Labeling Guide, Chapter V: Ingredient Labeling (page content dated 2005). Read 2026-10-22.
- Novel SNP markers on ginsenosides biosynthesis functional gene for authentication of ginseng herbs and commercial products. Chinese Journal of Natural Medicines, 2020. Read 2026-10-22.
- A comparison of British and US Pharmacopoeia standards for quality of ashwagandha dietary supplements in commerce. Phytotherapy Research, 2026. Read 2026-10-22.
- NCCIH, Using Dietary Supplements Wisely. Read 2026-10-22.
- FDA, Dietary Supplement Labeling Guide, Chapter VI: Claims (page content dated 2005). Read 2026-10-22.
- Phytochemical assays of commercial botanical dietary supplements. Evidence-Based Complementary and Alternative Medicine, 2004. Read 2026-10-22.
- Comprehensive profiling of Rhodiola rosea roots and corresponding products. Frontiers in Pharmacology, 2025. Read 2026-10-22.