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Community resources commonly document 2mL into a 5mg vial as the sweet spot
It is shallow, so the needle only travels a short distance, and it has fewer pain-sensitive nerves than deeper tissue, so most people feel a small pinch rather than a deep ache
18 Table 4 Time to Improvement of Abnormalities in Vitamin B12 Deficiency After Initiation of Treatment A 2005 Cochrane review involving 108 patients with vitamin B 12 deficiency found that high-dose oral replacement (1 mg to 2 mg per day) was as effective as parenteral administration for correcting anemia and neurologic symptoms
At 23.3 mg/mL the daily dose reads at 10 units (0.10 mL)
Studies confirmed that animals lacking these receptors showed no lipolytic response, validating this as the primary pathway