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> So what dosage would you recommend in terms of both and also is it always contingent on getting a blood test?

It is very personal, and as your body makes D3 when exposed to sunlight it also varies significantly with the seasons.

Ya but its winter so lets say its statistically insignificant? What do?

Edit: aha, thought experiment ;) just talking about this earlier

Edit: to child reply: surely it can't be that touchy or non-robust. Not asking for medical advice ;) just give me a floor to investigate

It’s really hard to say without bloodwork since unique sun and gut absorption rates plus other things that affect your gut can affect your absorption.

K Mayo Clinic says 600IU/daily. I'll take a 1000iu/with a K2 every other day maybe

600 iu is way too little. Your body can make 20 000 IU when exposed to the sun for half an hour. 600 IU is the equivalent of placebo

What do you think about hyperdosing D3 like a few times a month? Heard about that, something something lipophilic...

There's the NIH guidelines here:

https://ods.od.nih.gov/factsheets/VitaminD-HealthProfessiona...

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