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Vitamin B12 is not addictive
The estimated oral dose range from animal research is approximately 18 mg/kg, but human pharmacokinetic parameters including bioavailability fraction, Tmax, and clearance remain entirely unknown
For example, if you have 200mcg per 0.1mL and need 300mcg, calculate: 300mcg 200mcg = 1.5 0.1mL = 0.15mL = 15 units on the syringe.
In fact, because it supports the production of calming neurotransmitters like GABA and glycine, most people find it actually helps them relax
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