They are not FDA-approved
Combined Use of Semaglutide and Oral Contraceptives: What Does It Mean for Blood Clot Risks

Semaglutide Intermediates: (1) Main Chain : GLP-1 (9-37), CAS No.: 1169630-82-3, 95% up by HPLC (2) Side Chain : tBuO-Ste-Glu(AEEA-AEEA-OH-OtBu CAS No.: 1118767-16-0, 98% up by HPLC Fmoc-L-Lys[Oct-(otBu)-Glu-(otBu)-AEEA-AEEAI-OH CAS No.:1662688-20-1 , 98% up by HPLC (3) Molecular Blocks Octadecanedioic Acid Mono-tert-butyl Ester CAS No.: 843666-40-0, 98% up by HPLC AEEA-OH-HQ CAS No.: 134979-01-4, 98% up by HPLC Fmoc-AEEA-OH CAS No.: 166108-71-0, 98% up by HPLC Boc-AEEA-OH CAS No.: 108466-89-3, 98% up by HPLC Fmoc-AEEA-AEEA-OH CAS No.: 560088-89-3, 98% up by HPLC AEEA-AEEA-OH CAS No.: 1143516-05-5, 98% up by HPLC Boc-Hs( Trt)-Aib-OH CAS No.: 2061897-68-3, 99% up by HPLC Fmoc-Glu(OtBu)-Gly-OH CAS No.: 866044-63-5, 99.5% up by HPLC Boc-His(Eoc)-Aib-Glu(OtBu)-Gly-OH CAS No.: 1169630-31-2, 98% up by HPLC Function of Semaglutide Semeglutide is a long-acting glucagon-like peptide 1 (GLP-1) analog, a GLP-1 receptor agonist, and has potential therapeutic efficacy in type II diabetes mellitus (T2DM)

This is the hard logistical limit of microdosing
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This is a black box warning for the entire GLP-1 class based on thyroid C-cell tumor findings in rodent studies