Within sensible limits, the basics help your body hold its levels: a diet that includes B12 sources if you are not vegan, limiting heavy alcohol use, and not smoking, since both affect how you absorb and store nutrients
It is believed that vitamin B12 deficiency is not always detectable on blood tests
For example, when you take an oral supplement, your body absorbs the B12 through the lining of your stomach
Side effects are rare and typically mild: temporary injection site soreness, slight redness, or minor bruising
Low magnesium has been linked to migraine
Anecdotal human reports of cycles lasting 8 to 16 weeks describe no severe adverse events in the majority of accounts, but self-reporting bias and the absence of laboratory monitoring limit the reliability of the community safety record