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I've just discovered I have vit D levels of only 12 nmol. I'm been prescribed 400IU D3 twice per day and 20,000IU once per week for 3 months. I'm just wondering if anyone else has had levels that low and how long it took to bring them into normal ranges? I've only been taking them for a few days but my brain fog and fatigue has improved dramatically so I'm hoping that's a good sign.