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The following comparison summarizes the key considerations: For patients with intact GI absorption, oral high-dose supplementation (1,000 to 2,000 mcg daily) provides a convenient and cost-effective path to correcting deficiency
Some researchers keep a simple log tracking which site they used each week
Call your provider if: Youve had persistent side effects for more than 4 to 6 weeks with no improvement Youre struggling with daily tasks because of the symptoms Youre experiencing dehydration or cant keep food down You notice anything unusual that wasnt discussed when you started treatment And again, for severe pain, allergic reactions, or signs of serious illness, seek care immediately
doi: 10.1111/j.1464-5491.2012.03699 47 ApovianCMBergenstalRMCuddihyRMQuYLenoxSLewisMSet al
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