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Harada N, Okajima K, Narimatsu N, Kurihara H, Nakagata N
Vial Duration: Single 50 mg vial lasts 1020 days at research doses
[6] [25] At levels only slightly below normal, deficiency can result in fatigue, headaches, feeling faint, rapid breathing, pale skin, numbness or tingling, poor appetite, heartburn, poor balance, difficulty walking, poor reflexes, blurred vision, memory problems, depression, irritability, inattention, cognitive decline, dementia, and even psychosis
A broader review found it might brighten skin in sun-exposed areas but labeled the overall evidence as "inconclusive" due to mixed study quality (PubMed Systematic Review)
Consistent quality, arrives well packaged, and the documentation is thorough
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