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The soreness correlates with injection technique: reviews mentioning "slow injection over 30 seconds" report 28% less soreness than those describing "quick push" technique (pattern analysis from 340 reviews specifying technique)
Weinheim: Wiley-VCH
For subcutaneous B12 injections, a needle with a gauge of 25-27 and a length of 3/8 to 5/8 inch is commonly used
When B12 is low, people commonly experience fatigue , numbness/tingling, and cognitive or mood changes
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