Why do female hormone cycles affect peptide muscle growth outcomes?
How does estrogen shape receptor response? IGF-1 receptor density in skeletal muscle is not fixed. Estrogen drives its upregulation, which means the tissue-level response to IGF-1-class female muscle growth peptides is stronger during high-estrogen phases than during low-estrogen ones by a margin that shows up clearly in controlled female-subject protocols. A compound producing measurable lean […]