I am relatively active and I follow a pretty clean Diet which has not changed since including the supplement I will continue to use it to see if its working or not Vitastir has been very good with their follow up and shipping and also customer service on the phone
Some uncommon side effects that could occur are some weakness, nausea, bowel problems, dizziness, lethargy, weight loss, thirst, nervous irritability, itchy skin, frequent urination, high levels of calcium
Most Common B12/MIC Side Effects If irritation continues to occur, apply an over-the-counter itch cream, preferably with hydrocortisone, or discontinue use entirely
Reported effects include: Local discomfort at the injection site
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B12 itself doesnt mask other deficiencies, but its possible to have other vitamin deficiencies (like folate or vitamin D) at the same time