Vast majority of population is vitamin D deficient all year round, even spending at least 4 hours a day half naked outdoors in Hawaii would not provide you enou

Vast majority of population is vitamin D deficient all year round, even spending at least 4 hours a day half naked outdoors in Hawaii would not provide you enough vitamin D [1] and I doubt you spend that much time half naked in sunlight in other seasons, even 80-90% of Indian population living close to equator with much more sunlight is vitamin D deficient [2]. At very least I'd recommend following Finnish guidelines. [3] [1] https://pubmed.ncbi.nlm.nih.gov/17426097/ https://pubmed.ncbi.nlm.nih.gov/17426097/ [2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6060930/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6060930/ [3] https://academic.oup.com/eurpub/article/27/2/268/2670162 https://academic.oup.com/eurpub/article/27/2/268/2670162