All Things Peptides — Dr. Andrew Huberman
In a Nutshell
Peptides like GLP-1 agonists (Ozempic, Mounjaro, Retatrutide) produce robust weight loss by raising circulating levels a thousandfold, but they also cause muscle loss and can increase apathy. Growth-hormone secretagogues (Sermorelin, Ipamorelin, Tesamorelin) raise GH/IGF-1 modestly and improve deep sleep, yet they fall short of pharmaceutical GH for fat loss, tissue repair, and well-being. BPC-157 shows strong tissue-healing effects in animals and is popular for injury recovery, but it lacks human trials; clean, prescription-grade sourcing is essential, and routine use without injury is not advised.
These notes were generated by AI and may contain inaccuracies.
Peptides are short chains of amino acids, with insulin being one example. People frequently ask about various peptides, and some suggest that for certain goals like increasing testosterone or growth hormone, it may be more straightforward to use cypionate and HGH. However, peptides are not expected to deliver the same anabolic growth or feelings of well-being as these substances.
Abu Bakr, an MD, discussed peptides on a podcast, noting that for hundreds if not thousands of years, medicines have been sought in plants, and pharmaceutical companies continue to do so. Now, people are searching for medicines within the body itself. Peptides serve as a strong example of this approach.
GLP agonists such as Ozempic, Mounjaro, and the upcoming Retatrutide by Eli Lilly are peptides that increase circulating GLP levels to a thousandfold above normal. These drugs produce robust weight loss. Retatrutide affects the GLP, GIP, and glucagon systems. Caution is advised with microdosing these medications. At standard dosages, they may increase apathy and reduce cravings for alcohol and possibly cravings in general. Some individuals experience nausea, leading some to take lower doses while still achieving weight loss benefits with reduced nausea.
GLP drugs that raise levels 100-fold were initially used to treat diabetes and are still used for this purpose, but they did not induce significant weight loss. In contrast, those that increase GLP levels by a thousandfold or more lead to robust weight loss, including muscle loss. Retatrutide, which hits GLP, GIP, and glucagon systems, produces the most robust weight loss among these agents and may spare some muscle. Resistance training is recommended to offset muscle loss.
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