At our age even doctors recommend that ALL actors of the Vit-B complex should be supplemented by both genders. Vit-B is known to be an age-dependant emerging deficit, and it effects EVERYBODY, its an aging symptom. That is common medical advice even beyond the supplementers' community.
Niacin is also available as "flush-free".
Beside its usually described medical benefits, it also can support the adaptation to increasing doses of iodine (B2 as well), and can prepare for the the detoxification reaction that many people misunderstand to be "iodine intolerance" (which for organic - and
essential!!! - iodine does not exist and cannot exist. Radioactive iodine isotopes obviously are something very different).