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The early-stage literature and user anecdotes often describe a loading phase with daily doses, followed by a maintenance phase at reduced frequency
May include: nausea, diarrhea, vomiting, constipation, stomach (abdomen) pain, headache, tiredness (fatigue), upset stomach, dizziness, feeling bloated, belching, gas, stomach flu, heartburn, and runny nose or sore throat
doi:10.1111/ijcp.13731 5
You can read more in our guide on how long it takes for B12 injections to work
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