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Another trial found that vitamin B 6 supplementation (20 mg/day of pyridoxine hydrochloride) for three months improved memory, especially long-term memory, in 38 healthy elderly men (70-79 years) compared to 38 men of similar age who received a placebo (118)

However, research by Ding et al

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Food and Drug Administration, Recommendations for Investigational COVID-19 Convalescent Plasma, April 13, 2020, accessed April 13, 2020, 8 Matthew Herper and Adam Feuerstein, How Blood Plasma from Recovered Patients Could Help Treat the New Coronavirus, STAT, March 5, 2020, accessed April 13, 2020,