How to choose quality Turkesterone: what to look for on the label

After the boom in popularity, the turkesterone market has filled with products of very different quality: from highly purified extracts to capsules in which independent laboratories found no active substance at all. The editorial team explains how to read the label of turkesterone specifically, which of its features distinguish it from other supplements, and which documents are worth demanding from the seller.

Why turkesterone has especially many problems

Turkesterone is extracted mainly from Ajuga turkestanica, which grows naturally in the mountainous regions of Central Asia. The raw-material base is limited, and the turkesterone content in the plant is comparatively low and variable. When demand rose sharply in 2021, the supply of quality raw material did not keep up with it.

The second problem is analytical. For accurate quantification of any compound by liquid chromatography, a laboratory needs a certified reference standard of that substance. For 20-hydroxyecdysone such standards have long been available, but for turkesterone they were for a long time rare and expensive. This complicated independent verification and opened room for inaccurate claims.

The third is regulatory. Like other dietary supplements, turkesterone does not undergo registration as a drug, so verification of composition before sale is not mandatory. Studies of the market of ecdysterone supplements (Ambrosio et al., 2020) showed that labeling in this class of products is unreliable, and there is no reason to consider turkesterone an exception.

Finally, the risk of contamination. The IOC consensus on supplements (Maughan et al., 2018) and data from Geyer and co-authors (2008) remind us that sports supplements, especially those with "anabolic" positioning, more often than others contain undeclared prohibited substances.

Ajuga extract or turkesterone: decoding the composition

The first thing worth clarifying is what exactly is stated in the composition: "turkesterone" as a specific compound or "Ajuga turkestanica extract." This is a fundamental difference. A plant extract contains a whole mixture of substances: turkesterone, 20-hydroxyecdysone, other ecdysteroids (Dinan, 2001), iridoids, flavonoids. The proportion of turkesterone in it may be small.

A correct label names both the plant (in Latin, with an indication of the part — aerial part or root) and the amount of turkesterone in milligrams per serving. If only the mass of the extract is stated, it is impossible to calculate the dose of the active substance.

• Good:"Ajuga turkestanica extract (aerial parts) 500 mg, standardized to 10% turkesterone (50 mg)."
• Questionable:"Ajuga turkestanica 500 mg" without standardization.
• Bad:"Turkesterone Complex 1000 mg" within a proprietary blend with other components.
• Alarming:"Turkesterone 500 mg" in a cheap product without any documents — a pure compound of this grade costs a lot.

It is also useful to check whether turkesterone has been substituted with ecdysterone. There are products in which cheaper 20-hydroxyecdysone is sold under the name "turk." They can be told apart only by a chromatogram with reference standards of both substances.

Standardization percentage and cost per milligram

On the market, extracts standardized to 2%, 10%, 20% and above are common, as well as isolated turkesterone with a purity of 90–98%. The higher the percentage, the less "ballast" in the capsule and the more active substance per serving.

The fairest way to compare products is the price per milligram of declared turkesterone. Divide the cost of the package by the number of servings and by the turkesterone content per serving. A very low price per milligram at a high declared purity is a signal to check the documents especially carefully.

Certificate of analysis: what to look for in it

A certificate of analysis (CoA) is the key document for turkesterone. But the mere fact of its existence guarantees little: what matters is what exactly is written in it and by whom it was issued.

First, the method. For turkesterone, HPLC using a reference standard of turkesterone specifically is considered acceptable, ideally with mass-spectrometric confirmation. If the certificate states UV spectrophotometry or "total ecdysteroids," this does not confirm the content of the specific compound.

Second, the chromatogram. A quality certificate contains a graph with peaks and retention times, where the turkesterone peak, identified against the standard, is visible. It is useful if the content of 20-hydroxyecdysone is also stated separately — this shows that the laboratory distinguishes these compounds.

Third, batch correspondence. The batch number in the certificate must match the number on your jar, and the analysis must be performed by an independent laboratory whose name can be verified. A raw-material supplier's certificate without analysis of the finished product is weaker evidence.

Fourth, safety indicators: heavy metals, microbiological purity, residual solvents. For athletes — also screening for prohibited substances within programs such as Informed Sport or Kölner Liste.

Dosage forms and "improved bioavailability"

Some brands offer turkesterone in a complex with cyclodextrin, in a liposomal form or in sublingual tablets, promising a multifold increase in absorption. Cyclodextrins are indeed used in pharmaceutics to improve the solubility of lipophilic substances, and phytoecdysteroids have limited oral bioavailability, so the idea is not baseless.

However, the editorial team is not aware of any published pharmacokinetic studies that would compare turkesterone blood levels in humans after taking the usual and the "improved" form. Claims like "absorbed 10 times better" usually have no references to sources.

Practical advice: if a product with "improved bioavailability" costs significantly more, demand evidence from the manufacturer — pharmacokinetic data, not marketing graphs. In their absence, an ordinary well-standardized extract with confirmed composition is the more rational choice.

Also check the labeling for compliance with legal requirements: composition in Ukrainian, dosage, warnings, manufacturer and importer details, storage conditions. In the EU these requirements are defined, in particular, by Regulation 1169/2011 on the provision of information to consumers.

Editorial conclusions

Quality turkesterone is a product whose label clearly distinguishes the mass of the extract and the amount of turkesterone itself, and states the plant and the standardization percentage.

The main document is a certificate of analysis from an independent laboratory with a chromatogram, HPLC method and a turkesterone reference standard, tied to your batch number.

Promises of "improved bioavailability" and too-low prices for "pure" turkesterone require evidence, and for athletes subject to doping control, certification of the absence of prohibited substances is mandatory.

We also recommend reading "How to choose quality Ecdysterone: what to look for on the label," "The history of Turkesterone: how the supplement became popular" and "Turkesterone on a bulk: is there a point."

References

1. Ambrosio G, Wirth D, Joseph JF, et al. How reliable is dietary supplement labelling? Experiences from the analysis of ecdysterone supplements. J Pharm Biomed Anal. 2020;177:112877.
2. Maughan RJ, Burke LM, Dvorak J, et al. IOC consensus statement: dietary supplements and the high-performance athlete. Br J Sports Med. 2018;52(7):439–455.
3. Geyer H, Parr MK, Koehler K, et al. Nutritional supplements cross-contaminated and faked with doping substances. J Mass Spectrom. 2008;43(7):892–902.
4. Dinan L. Phytoecdysteroids: biological aspects. Phytochemistry. 2001;57(3):325–339.
5. Usmanov BZ, Gorovits MB, Abubakirov NK. Phytoecdysones of Ajuga turkestanica. Chem Nat Compd. 1975.
6. Regulation (EU) No 1169/2011 of the European Parliament and of the Council on the provision of food information to consumers. Off J Eur Union. 2011;L304:18–63.