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Get the length wrong, and you might not deliver the compound to the intended tissue layer
The normal range of Vitamin B12 in adults is 180-1000 picograms per millilitre (pg/mL),but a slight variation in the range is possible depending on the specific laboratory
Stimuli-Responsive In Situ Gelling System for Nose-to-Brain Drug Delivery
I know that there are studies that show that sublingual B12 is as good as B12 injections (7) but my own experience suggests that this is NOT the case
Shorter needles (e.g., 5mm or 6mm) are insufficient for reliable subcutaneous injection, while longer needles (10mm or more) risk penetrating intramuscular or neurovascular structures
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