Ingredients, Extracts & Quality
What the research says about species mix-ups, plant parts, extracts, marker compounds, contamination and labels in adaptogen products, and what testing can and cannot show.
Content last updated . This page has not been medically reviewed.
Safety first. Natural products can cause side effects and interact with medicines. Read who should be careful, by situation before you use anything on this page.
"Adaptogen" is a contested label, not a regulated product category, so two bottles with the same name on the front can hold different plants, different plant parts and different extracts. This page is the overview of that problem. It is information only, and it does not rank or recommend any product. For the background on the term, see What are adaptogens?.
Studies that tested real products on the market found mismatches between label and contents. Those studies were small, looked at particular herbs in particular countries, and used different methods, so they show that problems occur. They do not give a rate for every product. One of the main government sources we read puts it plainly: "What’s on the label may not be what’s in the product." [1]
| Question | What the sources found | Where to read more |
|---|---|---|
| Is it the right plant? | Substitution or mixing was reported for ginseng, Siberian ginseng and rhodiola products. | More about Is it the right plant? → |
| Is it the right plant part? | Many ashwagandha products tested contained leaf or other aerial parts as well as, or instead of, root. | More about Is it the right plant part? → |
| Powder or extract? | The same herb is sold as powder and as extracts made with different solvents. | More about Powder or extract? → |
| What does "standardized" mean? | A marker compound was measured. In tested products the labeled marker amounts were often not confirmed. | More about What does "standardized" mean? → |
| Is it clean? | One small study found lead and nickel above limits in some products. | More about Is it clean? → |
What was found, herb by herb
Ginseng. A review of 507 ginseng-containing products sold in 12 countries found 76% authentic and 24% reported as adulterated, mostly by swapping one Panax species for another. [2]
Rhodiola. In about 40 commercial Rhodiola rosea products, roughly one fifth did not contain rosavin, the marker used to tell R. rosea from related species. [3] A separate study found the labeled salidroside and total rosavins confirmed in fewer than a quarter of products. [4]
Siberian ginseng and roseroot in the UK. DNA testing of 25 Siberian ginseng and 14 roseroot products found extra Eleutherococcus species in 36% of the Siberian ginseng products, and only five of ten rhodiola-containing roseroot products matched R. rosea. [5]
Ashwagandha. In a comparison of 25 supplements, only 10 met both the British and US pharmacopoeia standards used in the study, and only two were confirmed as root-derived. [6]
Contamination
A 2025 study of eleven supplements containing ashwagandha, rhodiola, ginseng or schisandra on the Polish market reported widespread contamination, mainly lead and nickel, with the highest levels in schisandra preparations. [7] Eleven products is a very small sample, so treat it as a warning that testing matters, not as a measure of the market.
Labels, blends and testing
In a review of spice-plant supplements, amounts were declared on only about 55% of labels, and common names were used more often than Latin names. [9] That review studied culinary spices, not adaptogens, but it shows why a label alone may not let you compare a product with a study. Guides to reading labels, proprietary blends and certificates of analysis go further. General information on certification programs is at Quality testing and certifications. Mushroom-specific terms are on Understanding mushroom ingredients.
Frequently asked questions
Does a standardized extract work better?
Proper evidence not found in the sources we read that standardization by itself makes a product work better. NIH says "standardized" does not necessarily guarantee quality or consistency. [1]
How can I tell whether a product contains the plant on the label?
You cannot tell from the front of the bottle. In tested products, mismatches were found by DNA and chemical testing, which individuals cannot do. [5][2] A pharmacist can help you read the label.
Are leaf products and root products the same?
No. Ashwagandha supplements may contain root, leaf, or both, and a result for one part does not transfer to another. [8] See plant parts.
Does "natural" or "third-party tested" mean safe?
No. Testing shows what was in a tested batch. The sources we read do not say that it shows a product is safe for you, especially if you take medicines.
Are adaptogen products regulated like medicines in the US?
No. NIH says supplements are not approved by the FDA before sale. [1]
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.
What regulators and NIH say about the system
In the United States, dietary supplements are not approved by the FDA before sale, and the FDA can act against adulterated or misbranded products only after they are on the market. [8][1] Companies are required to make products with quality controls and label them accurately, yet NIH notes the FDA cannot test every product. [1] NIH also warns that a maker using the word "standardized" does not necessarily guarantee quality or consistency. [1] Rules by country are covered on Adaptogen regulation and conservation.
Limits of what we know
Good identity and marker testing tells you what is in a batch. The sources we read do not say that a tested product works better or is safer to take. Quality does not replace the safety questions below. Study results also depend on the exact extract used: NIH notes that ashwagandha trials have used a variety of preparations. [8]
Safety: who should ask a clinician or pharmacist
Quality problems matter most when an herb already carries cautions. NIH reports rare cases of liver injury linked to ashwagandha supplements and says ashwagandha is not recommended before surgery or with autoimmune or thyroid disorders, and should be avoided in pregnancy and while breastfeeding. [8] For Asian ginseng, NIH lists reports of liver damage and severe allergic reactions, possible worsening of autoimmune disorders, interference with blood clotting and possible blood sugar lowering. [10] Interactions between rhodiola and losartan have been reported. [11] Tell the surgical team and your pharmacist about every supplement you use, and see medication interactions. Contamination is a reason to ask a pharmacist, not a way to judge a product yourself.
References
- NCCIH, Using Dietary Supplements Wisely (last updated January 2019). https://www.nccih.nih.gov/health/using-dietary-supplements-wisely. Read 2026-10-23.
- Ichim MC, de Boer HJ. A review of authenticity and authentication of commercial ginseng herbal medicines and food supplements. Front Pharmacol. 2021;11:612071. Read 2026-10-23.
- Booker A, et al. The authenticity and quality of Rhodiola rosea products. Phytomedicine. 2016;23(7):754-762. Read 2026-10-23.
- Marchev AS, et al. Authenticity and quality evaluation of different Rhodiola species and commercial products based on NMR-spectroscopy and HPLC. Phytochem Anal. 2020;31(6):756-769. Read 2026-10-23.
- Ruhsam M, Hollingsworth PM. Authentication of Eleutherococcus and Rhodiola herbal supplement products in the United Kingdom. J Pharm Biomed Anal. 2018;149:403-409. Read 2026-10-23.
- Avula B, et al. A comparison of British and US Pharmacopoeia standards for quality of ashwagandha dietary supplements in commerce. Phytother Res. 2026;40(8):4833-4844. Read 2026-10-23.
- Jasińska-Balwierz A, et al. Heavy metal contamination in adaptogenic herbal dietary supplements. Biology (Basel). 2025;14(11):1479. Read 2026-10-23.
- NCCIH, Ashwagandha: Usefulness and Safety (last updated March 2023). https://www.nccih.nih.gov/health/ashwagandha. Read 2026-10-23.
- Saldanha LG, Dwyer JT, Betz JM. Culinary spice plants in dietary supplement products and tested in clinical trials. Adv Nutr. 2016;7(2):343-348. Read 2026-10-23.
- NCCIH, Asian Ginseng: Usefulness and Safety (last updated February 2025). https://www.nccih.nih.gov/health/asian-ginseng. Read 2026-10-23.
- NCCIH, Rhodiola: Usefulness and Safety. https://www.nccih.nih.gov/health/rhodiola. Read 2026-10-23.