Plant- and insect-derived steroid-like compounds marketed for muscle growth without acting like ordinary anabolic steroids. The most encouraging human result is a single training study; other short studies found no benefit, and many products contain almost none of what their labels claim. Side effects so far are mild; long-term safety is unknown. (Full Review)

Protocol

Common Dose

200–500 mg/day

Ecdysterone or turkesterone; marketing convention, not dose-finding studies. Positive trial used only ~50 mg/day ecdysterone.

Timing

Split, with meals

Short half-life and low oral bioavailability; commonly split into two or three doses with meals, around the training schedule.

Use With

Resistance training

The intended use is alongside resistance training, the context of the only positive human trial.

Time to effect

Muscle & Strength

~10 weeks

Measurable muscle and strength differences emerged over a 10-week training block in the single positive trial.

Acute Effects

None expected

No acute, noticeable effects; shorter 4-week trials showed nothing.

Benefits

Low: Increased muscle mass and strength with resistance training

Speculative: Metabolic support; cardiovascular and anti-inflammatory effects; preservation of muscle and physical function in aging; neuroprotective and cognitive effects

Contraindications

Pregnancy and breastfeeding

Hormone-sensitive conditions

Competitive athletes subject to anti-doping testing

Key Interactions

Renin-angiotensin-system drugs (ACE inhibitors, ARBs)

Risk & Side Effects

Low: Product mislabeling, underdosing, and contamination; mild gastrointestinal discomfort

Speculative: Unknown long-term and hormonal effects; anti-doping prohibited-substance risk for tested athletes

Monitoring

Marker	Target	Why
ALT / AST	~10–26 U/L	Screen for any liver stress during extended use
eGFR / creatinine	eGFR >90 mL/min/1.73m²; creatinine mid-reference	Screen kidney function, as elimination is partly renal
Fasting glucose	70–85 mg/dL	Track the proposed metabolic (calorie-restriction-like) effect
HbA1c	<5.4%	Longer-term blood-sugar control if metabolic effect is a goal
Lipid panel (LDL-C, triglycerides, HDL-C)	LDL-C optimal-low; triglycerides <80 mg/dL; HDL-C >50 mg/dL	Track proposed lipid effects seen in animals
Body composition (lean mass)	Individualized (track change)	Capture the main intended outcome — change in lean mass

Cadence: Baseline, then ~8–12 weeks, and every 6–12 months if use continues.

Qualitative Assessment

Strength progression on key lifts (e.g., bench press, squat loads)
Training recovery and perceived fatigue between sessions
Subjective energy levels
Any gastrointestinal discomfort that would signal poor tolerance

Ecdysteroids for Health & Longevity

Protocol

Benefits

Risk & Side Effects

Monitoring

Qualitative Assessment