alt Hacker News> I took 2000IU (+K2) a day for many years in between testing my blood levels and still had <30ng/ml and had to go up to 5000IU/day.
Likewise, 23ng/ml while taking 2000iu/day of dry vitamin-d.
Switched to 5000iu +K2 in MCT oil, -- 8 months later I'm at 64ng/ml.
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rbjorklin • yesterday at 9:45 PM
Any noticeable difference how you feel health wise? Energy levels? Mood? Sleep quality?
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I switched from 2000 to 5000iu about 8 years ago. My levels went up similar to yours, but I don't feel much different!