PlainPill
SupplementPerformanceSleep

Gplc

The short answer. There isn't much data on Gplc yet — 10 mentions, 3 with a clear outcome — so treat these numbers as anecdotal. It is most often used for performance: 80% of 5 reports say that improved. There is a moderate body of research — 1 meta-analyses and 4 trials.

Compare with…Alternatives for performance
What users report
0%helped3 reports · few reports
0 helped3 mixed0 didn't help

From 10 mentions in total — the rest didn't say how it went and aren't counted.

Clinical research
BModerate research base
1
meta-analyses
4
RCTs
26
papers

What Gplc does, according to users

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

Performance80% of 5
1 more with fewer than 3 reports
Sleep100% of 1
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 · 2021 · Meta-analysis / systematic review
Effect of Acute and Chronic Oral l-Carnitine Supplementation on Exercise Performance Based on the Exercise Intensity: A Systematic Review

Conclusion: In summary, l-C supplementation with 3 to 4 g ingested between 60 and 90 min before testing or 2 to 2.72 g/day for 9 to 24 weeks improved high-intensity exercise performance. However, chronic or acute l-C or GPL-C supplementation did not present improvements on moderate exercise performance.

PubMed 34959912 ↗

Dosage people report

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

~1.2 gdaily
1.5 g4.5 g
1.5gdaily

Reported side effects

How often each side effect came up across all reports.

No side effects reported so far.

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 (4)

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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