The most frequently reported side effect is nausea, particularly when starting treatment or after a dose increase. Injecting in the evening near bedtime can help you sleep through the worst of it. Constipation or diarrhea may also occur.
The B12 in this formulation is specifically included to help reduce nausea. If symptoms are severe or persistent, contact your EOS Health clinician — prescription anti-nausea medication is available when needed.