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If low B12 explains fatigue and weight loss, replacement will likely restore health and weight
As of April 21, 2026, regulatory status for many peptides remains under review and may change as additional data and guidance become available
The injection itself is usually hydroxocobalamin, which the UK prefers over cyanocobalamin because it stays in the body longer, as set out in the BNF entry
2025 Mar;31(3):e70001
No serious adverse events, liver enzyme elevations, or cardiovascular changes were documented in the Phase 1 safety study published in the Journal of Clinical Endocrinology & Metabolism in 2024
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