For a guide on what to look for in a legitimate provider, see: Peptide Therapy Providers in 2026 Compared: What to Look For in a Legitimate Clinic The Honest Assessment: What We Know and What We Don't It's important to be clear-eyed about the evidence base
However, if we do not get sufficient amounts from the diet (as in strict vegetarianism) or our bodies cannot absorb it through food, we may need to take vitamin B12 for years
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Severe persistent vomiting, dehydration signs, or severe abdominal pain require immediate medical attention, whilst persistent nausea warrants GP review within 2448 hours
B12 injections may be particularly beneficial for: Those on GLP-1 medications experiencing fatigue or low energy Individuals following a low-calorie or plant-based diet Anyone with a B12 deficiency or absorption issues Final Thoughts While GLP-1 medications are highly effective for weight loss, they work best when combined with proper nutrition, hydration, and supplementation