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 Vitamin D3 seems pretty critical for people who code too much  
 D3 + K2 
 K2 supplementation can cause hypertension for some 
 Problem is that vitamin D suppletion seems uncorrelated with all-cause mortality, where as sun expose does increase longevity 
 I will say that - anecdotally - vitamin D suppletion does help with my general feeling of well being during the winter months, though 
 Vitamin D. Was diagnosed with extreme lack of 2 winters ago. Don't ever want to be in this state again.  
 Been there, brother 🫂 Fell down the vitamin D rabbit hole ever since. 

I try to get as much vit D in the summer months as possible and keep track with an app - dminder. 

Next step is a tan through swimming trunk 
 Gotta get outside on every sunny day you can, walking and D3