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The most common problems are with the stomach and intestines
The legitimate post-shortage exceptions are real but limited: a documented patient-specific clinical need such as a verified allergy to one of the inactive ingredients in the branded product (for example, polysorbate-80 sensitivity), or a clinically required dose strength that the commercial product does not provide
Vitamin B12 Health professional version
It is a gradual process, but if you stick to the plan, you should see consistent progress
DOI: 10.1054/mehy.2000.1169 Traish, A.M., et al
If your sleep gets worse, move the dose earlier
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