Side-by-side comparison of mechanisms, dosing, interactions, and stacking potential.
| Fadogia Agrestis | Rhodiola Rosea | |
|---|---|---|
| Category | Adaptogens | Adaptogens |
| Standard Dose | 400-600mg daily | 200-400mg daily (standardized to 3% rosavins, 1% salidroside) |
| Timing | Morning with food. | Morning and/or early afternoon on empty stomach. AVOID evening dosing (stimulating). Take 30 min before meals. |
| Cycle Duration | Cycle 4-8 weeks on, 2-4 weeks off (limited long-term safety data) | Cycle 8-12 weeks on, 2 weeks off |
| Evidence Level | animal_plus_anecdotal | moderate_human |
Fadogia agrestis stem extract contains saponins and alkaloids that appear to increase luteinizing hormone (LH) release from the anterior pituitary, stimulating Leydig cell testosterone production. Animal studies suggest it may also have direct effects on testicular steroidogenic enzymes and may increase testicular weight. The saponin content may modulate gonadotropin-releasing hormone (GnRH) pulse frequency. The aphrodisiac effects are likely mediated through increased testosterone and possibly direct effects on dopaminergic and nitrergic pathways.
400-600mg daily
Morning with food.
Cycle 4-8 weeks on, 2-4 weeks off (limited long-term safety data)
Rhodiola's key bioactives are rosavin (unique to R. rosea), salidroside, and tyrosol. It modulates the HPA axis stress response by inhibiting cortisol release and stress-activated protein kinases (SAPKs/JNK). Salidroside activates AMPK, enhances mitochondrial biogenesis via PGC-1alpha, and stimulates glucose uptake. Rhodiola inhibits monoamine oxidase A and B (MAO-A, MAO-B), increasing synaptic serotonin, dopamine, and norepinephrine levels. It also stimulates Nrf2 antioxidant defense, increases erythropoietin (EPO) production, and enhances beta-endorphin levels during exercise.
200-400mg daily (standardized to 3% rosavins, 1% salidroside)
Morning and/or early afternoon on empty stomach. AVOID evening dosing (stimulating). Take 30 min before meals.
Cycle 8-12 weeks on, 2 weeks off
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