Nameless King
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Growth hormone isoform responses to GABA ingestion at rest and after exercise - PubMed
Our data indicate that ingested GABA elevates resting and postexercise irGH and ifGH concentrations. The extent to which irGH/ifGH secretion contributes to skeletal muscle hypertrophy is unknown, although augmenting the postexercise irGH/ifGH response may improve resistance training-induced...
pubmed.ncbi.nlm.nih.gov
The supplement is GABA, a naturally occurring amino acid responsible for a calming, anti-anxiety effect.