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However, younger adults are not safe, and B12 deficiency can result from stress, poor nutrition and certain medications like antacids or diabetes drugs
What Happens After Your First B12 Injection Following your first B12 injection, several physiological processes begin immediately, though you may not feel different straight away
A 2025 meta-analysis of 16 studies involving 6,098 participants found no statistically significant difference between intramuscular, oral, and sublingual B12 supplementation routes (p=0.270)
While most patients tolerate B12 shots well, mild side effects can occasionally occur, including minor pain or redness at the injection site, mild diarrhoea, or, in rare instances, an allergic reaction
This placement affects how quickly the B12 is absorbed and put to work in your system
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