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It is found in human blood, saliva, and urine, with plasma levels declining from approximately 200 ng/mL at age 20 to 80 ng/mL by age 60

Retinoid discontinuation creates the benchmark comparison since topical vitamin A derivatives (tretinoin, adapalene, retinol) represent gold-standard anti-aging treatment with decades of research and user experience documenting post-treatment outcomes

This makes intuitive sense

Some men consider growth hormone secretagogues like sermorelin or ipamorelin alongside metabolic peptides to support lean mass retention

Sub-99% material introduces unknown variables uncharacterized impurity peaks may have their own biological activity or confound assay readouts