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2015 was a particularly gray winter here in Berlin. The sun didn't come out in weeks and although I felt fine, I suspected I was Vitamin D deficient and got a blood test done. I still have the scans:

2015-02-04: 25-Hydroxy-Vitamin-D3 level at 7.1 μg/l

Then, after taking a 20,000 IU pill per week for around two months:

2015-04-16: 25-Hydroxy-Vitamin-D3 level at 45.6 μg/l

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It was pretty similiar for me as well. In NRW, Germany. I was at <4 µg/l (not measureable). Welp. Took 20k/Week for 8 weeks as well. Felt a lot better, don't know my after result though.

The problem for me was. A few months later I was down to ~7ish again. Looks like I need a daily supplement then.

How did you feel before/after?

To be honest, I felt normal before and normal after. I'm not sure what my levels are now (and I feel normal too), but I've started taking weekly Vitamin D pills from DM. They have 5600IU and I've been taking two per week. Will probably just do a blood test in a month or two to see where I stand.

why one large pill a week?

Vitamin D has a relatively long half life in the body, so taking a large dose weekly results in essentially the same bodily concentration as taking smaller doses daily. Some people prefer taking their doses weekly as a matter of convenience.

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