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The main consideration with the pen and the thigh is ensuring you are placing it on the correct zone (front or outer, middle third) and not pressing too hard
Community research plans now often model subcutaneous amounts, but no approved clinical protocol or published human pharmacokinetic study has established those subcutaneous amounts
Shortening the frequency between shots
A healthcare professional can prescribe vitamin B12 intramuscular injections or nasal gel spray for people with a severe vitamin B12 deficiency
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