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B-complex vitamins also help reduce fatigue, improve mood, and support nervous system health
Take home message Mounjaro remains the most effective weight-loss injection in the UK in 2026, with an average weight loss of 22.5% at the maximum dose
Tirzepatide works on two hormone pathways
Legal Status Buy BPC-157 TB-500 UK Not controlled substances in the UK Legal to purchase for laboratory research purposes Astra Labs fully research-use-only compliant Not approved for human consumption Not licensed medicines no MHRA authorisation For the full legal breakdown on UK peptide law in 2026, see our dedicated guide: Are Peptides Legal in the UK
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