Gym bros are taking these 'natural' injections to build muscle

businessinsider.com/bi-today-saturday-newsletter-gym-bros-peptides-muscle-2025-7

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Hello! I'm Mia de Graaf. I run health coverage at Business Insider, and I'm stepping in for Joi-Marie this week while she's on…

This story appeared on businessinsider.com, 2025-07-26 10:41:01.
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