HEALTH NEWS * Clinical trial finds faster recovery from COVID-19 through targeted use of high-dose vitamin B3 in the gut * Chokeberry juice reduces blood vessel resistance in people with pre-diabetes * Antibiotics taken during infancy linked to early puberty in girls * Multivitamin use associated with lower risk of prostate cancer recurrence * Older adults with active social circles report better health, study finds * Heart rhythm disorder traced to bacterium lurking in our gums