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Symptoms can include: pale, blue, purple, or red fingers or toes cold, numb, or painful fingers or toes unexplained wounds on your fingers or toes Mental health conditions, such as psychosis or mania.* Serotonin syndrome (a dangerous condition caused by a buildup of serotonin in your body)
Older research also supports that taking 1,000 to 2,000 mcg of B12 is likely just as effective in treating deficiencies as injections
See what a recent study found in the What It Does section of our Melatonin Supplements Review, which includes our Top Picks for melatonin
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