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Headaches affect a small percentage of users, usually during the first week or two of administration
If needles aren't your thing, B12 supplements are also available in capsule, tablet, and liquid forms, which can often be purchased over-the-counter (via Medical News Today)
Qualifying HDHPs are health insurance plans that both incorporate a minimum annual deductible amount (i.e., it must be a high deductible), and an annual out-out-pocket maximum amount (limiting just how high that high deductible can be), both of which are set by the IRS
some people report headache, nausea, lightheadedness, fatigue, or changes in appetite/GI function
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