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When Food Is Not Enough After procedures such as gastric bypass surgery or duodenal switch surgery, the body absorbs less B12 from food

Accessed February 12, 2026

Vitamin B12 is needed to maintain good metabolism, health of blood cells and nerves

Why this matters for plastic surgery: Patients considering body contouring procedures may benefit from medically supervised weight loss to reach their goal weight before surgery

Neurological symptoms often develop gradually and may include: Paraesthesia : tingling or 'pins and needles' sensations, typically starting in the feet and hands Numbness : reduced sensation in the extremities, which may affect balance and coordination Burning pain : particularly in the feet, often worse at night Weakness : muscle weakness and difficulty walking Balance problems : unsteady gait and increased fall risk due to proprioceptive impairment Cognitive changes : memory problems, confusion, difficulty concentrating, and mood disturbances Haematological signs may accompany neurological symptoms and include fatigue, weakness, pallor, and shortness of breath due to megaloblastic anaemia

Research peptides are therefore supplied in lyophilised form, which is substantially more stable in transit and storage than a pre-mixed liquid