Focus / nootropic evidence brief
Paraxanthine is the main active metabolite of caffeine and is often presented as a newer stimulant ingredient. It is commonly promoted for energy, focus, endurance, and fewer caffeine-like drawbacks.
Early human studies suggest possible cognitive, energy, or exercise effects, but the evidence is young, product-specific, and far below caffeine's certainty.
Early RCTs report cognition, rowing, and energy-expenditure signals; independent replication remains limited.
Trials commonly use 100-300 mg acute dosing; comparisons with caffeine and sleep effects are still being mapped.
Independent trials and longer safety follow-up are still needed before this looks like a dependable caffeine alternative.
Source Drawer
The score reflects evidence that the supplement does its stated job. Some jobs are direct, such as strength, endurance, or recovery; others are indirect, such as sleep, mood, appetite, or health support. A real effect can still receive a cautious practical rating when dose, safety, product quality, or audience fit remain uncertain.
Send the disputed claim, source link, and why it changes the practical verdict. Corrections that materially affect the claim, dose, caveat, or rating are prioritized.
Report a source or rating issue