Effect of low-fat vs low-carbohydrate diet on 12-month weight loss in overweight adults and the association with genotype pattern or insulin secretion: the DIETFITS randomized clinical trial
Someone might start with orforglipron as a first-line oral option, switch to tirzepatide if they need more aggressive intervention, add combination therapies like cagrilintide for additional benefit, and eventually step down to oral maintenance therapy
This dynamic produced a largely unregulated online marketplace where telehealth companies and other sellers mass-produced and widely promoted compounded GLP-1 drugs containing a different source of the active pharmaceutical ingredient (what drugs are made from), meaning the compounded versions were not the same and according to the FDA, could contain incorrect doses, too much or too little of the active ingredient, and possibly contaminants and bacteria
This is why an oral B12 supplement might do nothing for your fatigue, but a B12 injection makes you feel different by that afternoon
10.1111/j.1471-4159.2009.05936.x J