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This 1000 mcg dose is the go-to for shots in the muscle or under the skin

Seek urgent medical attention (via NHS 111 or 999 in an emergency) if you experience severe or persistent abdominal pain, persistent vomiting, signs of dehydration (such as dizziness, reduced urination, or extreme thirst), or symptoms suggestive of low blood sugar (such as shakiness, sweating, or confusion)

It really helps with my energy, sleep and overall productivity

When these symptoms show up, higher doses of vitamin B12 may be needed to help

These reactions typically resolve with continued use as the skin acclimates, or with dose reduction