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Additionally, vitamin B12 is involved in the metabolism of homocysteine, an amino acid that, when elevated, can increase the risk of cardiovascular diseases

All references FDA: Concerns with unapproved GLP-1 drugs used for weight loss NEJM (2023): Retatrutide Phase 2 trial in obesity Eli Lilly: Phase 2 retatrutide results published in NEJM Eli Lilly (Dec 2025): Phase 3 TRIUMPH-4 topline results announcement ClinicalTrials.gov: NCT05882045 (TRIUMPH-3) Drugs.com: Retatrutide status & timeline Lilly Trials: TRIUMPH-3 summary page

The peptides molecular structure prevents it from crossing the blood-brain barrier and accessing hypothalamic regions responsible for hunger signaling

Unopened freeze-dried vials can be kept at room temperature or in the refrigerator for short periods with no issue

Topical/cosmetic use has the most consumer data