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I take the following:

- Vitamin D (mostly during winter times)

- L-Theanin ( https://www.sciencedirect.com/science/article/abs/pii/S03010... )

- Vitamine B12 (I am a vegetarian)

- Omega 3

- Vitamin C + Zinc (especially when I feel like there is a cold incoming due to the shortening effect of zinc see: https://pubmed.ncbi.nlm.nih.gov/21328251/ )

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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/

[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6060930/

[3] https://academic.oup.com/eurpub/article/27/2/268/2670162

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