Turkesterone: The TikTok Muscle Builder With No Real Trial Data

Turkesterone is an ecdysteroid — a steroid-like compound found in plants and insects — that became a breakout supplement trend on TikTok and fitness forums starting around 2021. Influencers claimed it produced steroid-like muscle gains without steroid side effects. The hype was extraordinary. As of 2026, no published human resistance-training trial has tested turkesterone against placebo with muscle or strength outcomes. The only human turkesterone study to date used acute (single-dose) measurements in 11 men and found no change in IGF-1 or resting metabolic rate.

What the Animal Data Actually Shows

The excitement around turkesterone traces to rodent and insect studies showing ecdysteroids can activate anabolic signaling pathways — specifically, stimulation of the estrogen receptor beta (ERβ) pathway and protein synthesis. A 2019 German study (Isenmann et al., Archives of Toxicology, PMID 31123801) actually tested the related compound ecdysterone — not turkesterone — in 46 men over 10 weeks of resistance training. It found significantly higher muscle-mass and bench-press gains in the ecdysterone groups. On that basis, the authors recommended ecdysterone be added to the WADA prohibited list. Crucially, this study used ecdysterone, not turkesterone, and the result has not been independently replicated.

The Only Human Turkesterone Trial

The first peer-reviewed human study of turkesterone specifically was published by Harris et al. in 2024 (Muscles, PMID 40757520). Eleven healthy men received single doses of turkesterone or placebo with measurements at baseline, 3 hours, and 24 hours post-ingestion. There were no statistically significant changes in serum IGF-1 (a key anabolic marker), resting metabolic rate, or lipid and carbohydrate metabolism. The authors concluded the data “fail to fully support turkesterone as a potent anabolic supplement.” This is an acute pharmacology study, not a resistance-training trial — meaning even the most fundamental claim, that chronic turkesterone improves muscle outcomes, has never been tested in humans.

The Bioavailability Problem

Turkesterone faces a fundamental pharmacological problem: its oral bioavailability is extremely poor. Ecdysteroids are poorly absorbed in the human gut and rapidly metabolized. Plasma concentrations achieved with typical supplement doses are a small fraction of the concentrations used in cell culture experiments showing anabolic activity. Supplement companies sell “complexed” or “cyclodextrin” turkesterone at premium prices claiming enhanced absorption — but no human pharmacokinetic data has shown that these formulations produce meaningfully higher blood levels.

The Bottom Line

Turkesterone supplements typically cost $40–$80 per month. The mechanism is speculative in humans, oral bioavailability is poor, the one published human study found no acute biochemical effect, and no chronic placebo-controlled training trial exists. The 2019 Isenmann study often cited in marketing was actually for the related compound ecdysterone — not turkesterone — and has not been replicated. For muscle building, the evidence-based options remain: creatine monohydrate, adequate protein (1.6–2.2 g/kg/day), progressive resistance training, and adequate sleep.