Contraindications: Not for use by individuals under 18 years of age, pregnant or nursing women, or anyone with a history of hormone-sensitive cancers. GW-501516 produced dose-dependent tumor development in multiple organ systems in long-term rodent studies at supratherapeutic doses; this finding is a mandatory disclosure regardless of mechanism. Persons with pre-existing hepatic impairment or dyslipidemia should seek physician clearance before use.
Side_Effects: Unlike AAS, virilization, gynecomastia, and androgenic acne are not mechanistically expected with GW-501516. Reported adverse signals in case literature include HDL suppression at prolonged higher doses and gastrointestinal discomfort. The carcinogenicity signal observed in rodent models has not been replicated in controlled human clinical data, but no long-duration human safety trial exists.
Monitoring: Obtain a full lipid panel (LDL, HDL, triglycerides), fasting glucose, and liver enzyme panel (ALT, AST, GGT) before, mid-cycle (week 4), and post-cycle (week 10+). Unlike SARM or AAS monitoring, LH/FSH tracking is not a primary endpoint; cardiovascular markers and inflammatory indices (hsCRP) are more relevant for PPARδ-acting compounds.
PCT: Post-Cycle Therapy (standard SERM-based protocol) is not mechanistically required because GW-501516 does not suppress the HPTA via androgen-receptor feedback. If stacked with SARMs or AAS in the same cycle, PCT requirements are determined by the androgen-receptor–active compounds in that stack, not by GW-501516 itself.