glp-1 drugs side effects 6 Common of Taking Medication Your guide to GLP-1 side
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Without specific safety data on these formulations during breastfeeding, they should be avoided

Postgrad Med J 96(1133):156161 Singh K, Aulakh SK, Nijjar GS, Singh S, Sandhu APS, Luthra S, et al (2024) Rebalancing the gut: glucagon-like peptide-1 agonists as a strategy for obesity and metabolic health

In the SCALE trial, patients receiving liraglutide lost an average 5.6 kg (~12 lbs) more than patients receiving placebo, which translated to a 5.4% body weight loss over the course of 56 weeks (NCT01272219)

Co-localisation of the Kir6.2/SUR1 channel complex with glucagon-like peptide-1 and glucose-dependent insulinotrophic polypeptide expression in human ileal cells and implications for glycaemic control in new onset type 1 diabetes

So the most fair interpretation is not, Berberine is useless. The fair interpretation is: Berberine may produce modest metabolic effects, but its weight-loss effect is nowhere near the effect seen with GLP-1-based obesity medications

That includes nausea, reflux, and dehydration risk
