PlainPill
Substance

Anhydrous Caffeine

The short answer. There isn't much data on Anhydrous Caffeine yet — 3 mentions, 0 with a clear outcome — so treat these numbers as anecdotal. There is a moderate body of research — 1 meta-analyses and 25 trials.

Compare with…
What users report
0%helped0 reports · few reports
0 helped0 mixed0 didn't help

From 3 mentions in total — the rest didn't say how it went and aren't counted.

Clinical research
BModerate research base
1
meta-analyses
25
RCTs
90
papers

What Anhydrous Caffeine does, according to users

Of the people who reported each effect, the share who said it got better.

No specific effects reported yet.
betterno changeworse

What the research says

Systematic reviews and meta-analyses from PubMed, with their published conclusions.

BModerate research base

At least one meta-analysis, or 5+ randomized controlled trials. The grade measures how much human research exists — read the conclusions below for what it found.

Nutrients · 2026 · Meta-analysis / systematic review
Dose-Response Effect of Oral Caffeine Use on Aerobic Exercise Performance: A Systematic Review and Meta-Analysis

Conclusion: Conclusions: This is the first meta-analysis specifically focused on aerobic time-trial performance to suggest that pre-exercise ingestion of low caffeine doses (1.3-3 mg·kg-1) may enhance endurance performance by reducing time-trial completion time. Notably, the use of moderate caffeine doses (4-6 mg·kg-1) appears to produce a more consistent ergogenic effect.

PubMed 42356375 ↗

Dosage people report

As stated by users — not a recommendation. Follow the label or your doctor.

~3 g (intended as vit C, actual lethal dose risk)as reported

Reported side effects

How often each side effect came up across all reports.

death ×1overdose ×1

What users say

First-hand experiences, quoted verbatim. We show one positive and one negative where both exist.

No first-hand experiences with a clear outcome yet.
Top discussions (3)

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User data from public discussions; research from PubMed. Information only, not medical advice — talk to a doctor before starting, stopping or combining anything. Data updated October 3, 2026. How we rate