Can You Take Caffeine and PeakO2 Together?

May affect absorption

The short answer

PeakO2 is an adaptogenic mushroom blend designed to improve oxygen utilization. Caffeine's vasoconstrictive properties may mildly oppose PeakO2's oxygen delivery enhancement in some individuals.

How to arrange timing

Generally well-tolerated together. Both are common in performance supplements. No significant clinical interaction reported.

Reference

Reference noted for this combination: Hirsch KR et al. Cordyceps militaris improves tolerance to high-intensity exercise after acute and chronic supplementation. J Diet Suppl. 2017;14(1):42-53

Important context

Whether supplements suit you together also depends on dose, product formulation, health conditions, and medication use. Ask a doctor or pharmacist first if you take medication, are pregnant or breastfeeding, or have a chronic condition.