A Cochrane review supports the use of high-dose vitamin B 12 (1 mg and 2 mg daily) in elevating serum vitamin B 12 level and achieving haematological and neurological responses, even in patients with PA or with ileal resection.58 The recommendation for oral replacement is 1 mg daily for a month, and then 125 to 250 g daily as maintenance dose for patients with dietary insufficiency and food-cobalamin malabsorption, while for PA the maintenance dose is 1 mg daily.29 Vitamin B 12 does not have side-effects even when prescribed in large doses.59 However, hypokalaemia, resulting from uptake of circulating potassium by newly growing and dividing haematopoietic cells, can be severe or sometimes life-threatening
The peptide makes that deficit more effective at mobilizing fat, but eating at maintenance or surplus won't produce results
Subsequent increases to 7.5 mg , 10 mg , 12.5 mg , and 15 mg follow based on tolerability and treatment response, as outlined in the complete tirzepatide dosing guide
However, extended exposure to heat or direct sunlight can degrade the peptide