At 500mg per capsule, you're getting **Rhodiola rosea** extract above the upper end of the studied dose range (144–400mg), so a single capsule already delivers a full clinical dose for supporting stress resilience and reducing mental fatigue. The extract is standardized to minimum 3% rosavins and 1% salidroside — the two marker compounds used in clinical trials to verify potency. If you're taking this for stress-related fatigue or to stay sharp during demanding periods, one capsule covers you.
Rhodiola has moderate clinical evidence for reducing perceived fatigue under stress and supporting mental performance when you're running low on energy. It also shows relevance for mood support, though the research there is thinner. The label suggests 1–2 capsules daily — one capsule is the sweet spot based on the research. Taking two puts you at 1,000mg, which is well beyond what most trials have tested.
Rhodiola can feel mildly stimulating, so you'll want to take it earlier in the day rather than before bed. If you're sensitive to energizing supplements, start with one capsule and see how you respond.
BioStacks
Other Ingredients (5)
MaltodextrinBinder
Spikes blood sugar faster than table sugar (glycemic index 85–105). Research links it to gut bacteria changes that may promote intestinal inflammation (Nickerson et al. 2015). Used as a cheap filler — adds nothing beneficial.
Silicon DioxideAnti-caking
Fine silica powder used to prevent clumping
HypromelloseCapsule
Plant-derived capsule material from cellulose
Microcrystalline CelluloseBinder
Plant-derived cellulose used as a binder and filler in supplements
Stearic AcidLubricant
Saturated fatty acid used as tablet lubricant
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Sources & Scoring
Nutrient data (RDA, UL, and safety thresholds) sourced from: NIH Office of Dietary Supplements and National Academies Dietary Reference Intakes (DRI).
This is not medical advice. Consult a healthcare provider before making changes to your supplement routine.
The score analyzes what's on the label: ingredient doses vs. clinical ranges, chemical forms, evidence levels, and known interactions. It does not verify label accuracy or test for contaminants — for that, look for third-party certifications like USP or NSF.