5 mg vial = 5,000 mcg total 2 mL water = 2,500 mcg per mL 2,500 mcg target = 1.0 mL draw TB-500 10 mg vial with 3 mL example A 10 mg TB-500 vial mixed with 3 mL gives about 3,333 mcg/mL, or 3.33 mg/mL
Peptides sprayed into the nose bypass the digestive system entirely, avoiding the enzymatic degradation that destroys oral peptides
However, to maintain optimal B12 levels and sustained benefits, regular injections are often necessary, typically every few weeks or months

Common adverse effects include: Injection site reactions pain, redness, swelling, or bruising at the intramuscular injection site Gastrointestinal disturbances nausea, diarrhoea, or abdominal discomfort Headache and dizziness particularly following initial doses Skin reactions including rash, pruritus, or acne-like eruptions Flushing temporary redness of the skin Chromaturia red-coloured urine (harmless but can cause concern if unexpected) Less common but more serious reactions include: Hypersensitivity reactions ranging from mild urticaria to anaphylaxis (rare but potentially life-threatening) Hypokalaemia particularly during initial treatment when rapid cell production occurs [5] [16] Temporary changes in blood counts during correction of deficiency Interference with laboratory tests primarily with high-dose IV hydroxocobalamin used for cyanide poisoning, not typically with standard 1mg IM replacement doses Cautions and contraindications: Hypersensitivity to cobalt or vitamin B12 Cyanocobalamin should be avoided in Leber's hereditary optic neuropathy [2] [17] Chloramphenicol may reduce the haematological response to B12 therapy Patients receiving B12 injections outside clinical necessity face unnecessary risks without proven benefit

An opened vial stays in the same 20 to 25C range
Subcutaneous (Sub-Q) An injection given just under the skin, into the fatty layer