Nootropics
Phenylpiracetam
Also called fonturacetam, a racetam whose isomer-specific animal findings should not be presented as proven human enhancement.
Isomer-specific animal experiments
Also known as: fonturacetam · 4-phenylpiracetam · carphedon
Practical use
Reviewed practical notes
- Check the stereoisomer
- R, S and a mixture are not interchangeable research descriptions.
- Retain the outcome
- Animal weight or pain findings are not human cognitive outcomes.
- Keep sport status separate
- A prohibition is a rule, not a quantified proof of enhancement.
Overview
Phenylpiracetam has chemically distinct R and S forms. Experiments using a purified isomer do not automatically establish the effects of a mixture or a product sold under the general name. The cited research investigates dopamine-transporter activity and animal metabolic or inflammatory outcomes.
Risks and limitations
These experiments do not establish human chronic safety, dependence potential or reliable cognitive enhancement. A lack of increased movement in one animal experiment is not proof that every formulation is free of stimulant effects or adverse reactions.
How to read this
WADA lists fonturacetam, also identified as 4-phenylpiracetam or carphedon, as prohibited in competition in 2026. That classification does not itself prove a particular cognitive or athletic benefit.
Research explained
S-isomer in metabolic animal models
Who was studied
Western-diet-fed mice and Zucker rats in experiments lasting eight and twelve weeks, respectively.
What was found
The S-isomer inhibited the dopamine transporter and reduced weight gain or fat-related measures without increasing locomotor activity in the studied conditions.
What it cannot establish
This is animal, isomer-specific evidence. It does not establish human fat loss or the effects of racemic phenylpiracetam.
Read the original studyR-isomer and inflammatory responses
Who was studied
Male mice in experimental inflammatory and pain-related models.
What was found
The R-isomer showed dopamine-transporter-related pharmacology and effects on selected inflammatory or pain outcomes.
What it cannot establish
Mouse inflammatory tests do not demonstrate improved healthy memory or human pain treatment. Results cannot be freely transferred between stereoisomers.
Read the original studyThe exact form is part of the identity
An R-isomer paper, an S-isomer paper and a commercial mixture can describe different interventions. Retaining the form prevents a product from borrowing every favorable finding attached to a shared name.
Supporting sourceSources
2020 R-isomer inflammation study
Sources checked 2026-10-01.
General education; not a personal treatment plan.