Vitamin B12 injections help improve energy levels, support brain and nerve health, and treat vitamin B12 deficiency.They deliver vitamin B12 directly into the bloodstream, allowing faster absorption than tablets
Overall, at week 88, participants with 75% or more weight regain after tirzepatide withdrawal reversed cardiometabolic parameters to baseline (week 0) values, the team write, although they note those with up to 50% weight regain still showed improvements in these areas compared with the start of the study
What do they actually do

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The most common side effect is simply pain at the injection site
The largest published trial (METAOD006/OPTIONS) randomized 502 adults with obesity to AOD-9604 or placebo for 24 weeks alongside a diet and exercise program