Ozempic and its cousins started as diabetes drugs, became weight-loss blockbusters, and are now being studied as anti-aging agents. Below is every GLP-1 guide on the site — what these drugs do to your biological age, the muscle you can lose, microdosing, and the natural alternatives worth (and not worth) trying.
GLP-1 receptor agonists — semaglutide (Ozempic, Wegovy), tirzepatide and next-generation triple agonists such as retatrutide — are the most consequential metabolic drugs in a generation: in the STEP 1 trial, adults with obesity on once-weekly semaglutide lost an average of 14.9% of their body weight over 68 weeks, against 2.4% on placebo.[1] Beyond weight, an exploratory analysis of a 2026 randomised, placebo-controlled trial found semaglutide slowed the DunedinPACE epigenetic clock by about 9% relative to placebo over 32 weeks, which is why the longevity world is paying attention.[2][3] But the same drugs carry a real trade-off: in a network meta-analysis of 22 randomised trials, lean mass made up roughly a quarter of the weight lost,[4] and a 2025 clinical review puts the ceiling at up to 40% of total weight loss coming from fat-free mass — the tissue that keeps you strong and metabolically healthy as you age.[5] The guides here separate the genuine signal from the hype on both sides.
The guides here answer the questions people actually ask. Does Ozempic slow aging, or is that a headline stretched past its evidence? What is GLP-1 microdosing, and does a sub-therapeutic dose do anything in people who aren't overweight? How much of the weight you lose is muscle rather than fat, and what can you do about it? And is berberine — the supplement social media calls "nature's Ozempic" — a genuine alternative or just clever marketing? Each answer is drawn from the trials, not the marketing, including the 2026 randomised data that put semaglutide on the longevity map in the first place.
Whether you're on a GLP-1, considering microdosing, or looking at "natural Ozempic" supplements like berberine, the same principle applies: these are powerful interventions that work best alongside — not instead of — protein, resistance training and the basic longevity habits.[6] If you're worried about losing muscle, start with protein after 40. Every claim below is cited to peer-reviewed research, and none of it is medical advice — talk to your doctor before starting or stopping any medication.
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