what needle size for b12 injection should be used injections B12 Shots: Benefits, Uses, Safety, Cost & How They Work size needle for b12 injection
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On the other hand, a 30G gauge represents thinner, less painful needles at the cost of slower delivery

And in the 80s it increased to every three months, which is still what they use today
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Genes Dev 20:29132921
They say its not approved for obesity treatment and doesnt work well
