Myths About Laxogenin

Laxogenin, usually sold as 5α-hydroxy-laxogenin, is promoted as a plant-derived muscle builder that delivers steroid-like gains without hormonal side effects. It is a compelling pitch, and that is precisely why it deserves scrutiny. Our editorial team examined the most widespread claims and compared them with what the scientific literature actually contains.

What laxogenin is

Laxogenin is a steroidal sapogenin, a type of plant steroid structurally related to brassinosteroids, the growth hormones of plants. It occurs in small amounts in certain species of the Smilax genus, a group of climbing plants. The product found in supplements is 5α-hydroxy-laxogenin, a synthetic derivative that does not occur naturally in meaningful quantities.

Brassinosteroids drew interest from sports supplement manufacturers after laboratory work suggested they could stimulate protein synthesis in muscle cells. Laxogenin products are marketed on the basis of this broader class rather than on research into laxogenin itself.

In the UK, laxogenin is sold online as a food supplement, but we are not aware of any authorisation for it as a novel food in the UK or EU. Products that were not on the market to a significant degree before 1997 normally require such authorisation, so the legal status of many laxogenin products is questionable.

Understanding this background helps put the marketing claims into context. Let us look at them one by one.

Myth 1: Laxogenin is proven to build muscle

This is the central claim and the weakest. We could not identify any published randomised controlled trial in humans examining the effect of laxogenin or 5α-hydroxy-laxogenin on muscle mass, strength or performance.

The evidence usually cited comes from research on related brassinosteroids. A study by Esposito and colleagues, published in the FASEB Journal in 2011, found that homobrassinolide increased lean body mass and grip strength in rats and stimulated protein synthesis in muscle cell cultures. That compound is not laxogenin, and rat studies frequently fail to translate to humans.

Claims about specific percentages of increased protein synthesis that circulate on forums can rarely be traced to a primary source. Some appear to come from old patents or misread Russian or Japanese studies.

Without human data, any statement that laxogenin builds muscle should be regarded as speculation, however confidently it is presented.

Myth 2: It is natural and therefore safe

Labels often describe laxogenin as "natural" or "plant-based". In reality, the 5α-hydroxy form used in supplements is manufactured in laboratories. Even naturally derived substances are not automatically safe; plenty of potent drugs and toxins come from plants.

More importantly, no formal toxicology or human safety studies on laxogenin have been published. The absence of reported side effects does not demonstrate safety when nobody has systematically looked for them.

The claim that laxogenin does not affect hormones, liver or cholesterol therefore cannot be confirmed. It may be true, but it has not been tested.

Myth 3: It is the plant equivalent of ecdysterone

Laxogenin is often grouped with ecdysteroids such as ecdysterone or turkesterone, which are also plant steroids marketed for muscle growth. While there is some, still limited, human evidence for ecdysterone, including a 10-week study by Isenmann and colleagues published in Archives of Toxicology in 2019, these findings cannot be transferred to laxogenin.

Ecdysteroids and brassinosteroids belong to different chemical families with different proposed mechanisms. Even within one family, small structural changes can alter biological activity dramatically.

It is also worth noting that the ecdysterone study itself has been debated, and WADA added ecdysterone to its monitoring programme rather than banning it outright. That illustrates how uncertain the evidence remains even for the better-studied plant steroids.

In short, laxogenin rides on the reputation of its neighbours rather than its own data.

Myth 4: It is safe for drug-tested athletes

Laxogenin is not specifically named on the WADA Prohibited List. However, the list includes a category of other anabolic agents and substances with similar chemical structure or biological effect, and the bigger concern is contamination.

Research by Geyer and colleagues, published in 2004, found that around 15 per cent of non-hormonal supplements purchased internationally contained undeclared anabolic steroids. Products marketed as natural anabolics are considered particularly high risk, and some laxogenin products have been reported to contain substances not on the label.

The IOC consensus statement on dietary supplements advises athletes to use only products with independent batch testing. In the UK, schemes such as Informed Sport test products for prohibited substances, though no scheme can eliminate risk entirely.

Under the strict liability principle, athletes are responsible for anything found in their sample, regardless of whether it came from a contaminated supplement. Points to consider before using any such product include:

• Is there any published human research on the ingredient itself?
• Is the product batch-tested by an independent scheme?
• Does the label list exact amounts rather than a proprietary blend?
• Is the legal status of the ingredient in the UK clear?

Conclusions of the editorial team

Laxogenin is a textbook example of a supplement whose marketing far outstrips its evidence. There are no published human trials on muscle growth, no formal safety studies, and its regulatory status in the UK is unclear.

The research usually cited involves related compounds in rats and cell cultures. For athletes, contamination and anti-doping risks add another layer of concern. Training, adequate protein and sufficient sleep remain far better supported strategies.

For further reading, we suggest our articles on ecdysterone and turkesterone, on choosing batch-tested supplements, and on how much protein athletes really need.

References

1. Esposito D, Komarnytsky S, Shapses S, Raskin I. Anabolic effect of plant brassinosteroid. FASEB J. 2011;25(10):3708–3719.
2. Isenmann E, Ambrosio G, Joseph JF, et al. Ecdysteroids as non-conventional anabolic agent: performance enhancement by ecdysterone supplementation in humans. Arch Toxicol. 2019;93(7):1807–1816.
3. Geyer H, Parr MK, Mareck U, et al. Analysis of non-hormonal nutritional supplements for anabolic-androgenic steroids – results of an international study. Int J Sports Med. 2004;25(2):124–129.
4. 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.
5. Regulation (EU) 2015/2283 of the European Parliament and of the Council on novel foods. Off J Eur Union. 2015;L327:1–22.