Maybe... Consider the pale skins and sunless environs of Finland. Vitamin deficiencies are relevant. All these truly depend upon the veracity of those studies and their conclusions.
Overall, the "You need to take [insert plant, chemical, drug, vitamin, supplement, activity, process] and all your [CFS, "chronic" Lyme, COVID, autism, Alzheimer's....] will be prevented, cured, treated!!!" It's all capitalism, everything is for sale. Including the the souls of those that wittingly sell snake oil. Learn to be an informed skeptic....same with homeopathy, chiropractic and acupuncture....