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Altitude and air pressure At higher altitudes, lower air pressure can cause the rubber stopper to resist needle insertion differently, and drawing water into the syringe may feel slightly different
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However, compared to other methods like intramuscular and intravenous injections, subcutaneous injections may be absorbed more slowly into the bloodstream
B12 and Premature Greying One area where B12s role is more clearly established is in premature greying grey hair that appears before age 20-30 (depending on ethnicity)
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