Following my blood test a couple of weeks ago, it has emerged that my Vitamin D levels are low. I only discovered this when I went to pick up my regular prescription and the pharmacist said there were 2 prescriptions waiting for me, the other of which was these Vitamin D3 tablets. I was confused because I was under the impression that the surgery would ring me if anything came up that needed to be treated but they hadn't done (admittedly I hadn't rung them either-I was very busy and often didn't have any time to ring between those specific times). I rang them this afternoon after being given this prescription and the woman told me to take these 1000 mg tablets for 4 months and then have another blood test. I asked if I needed to discuss this with the doctor but she said I didn't need to. I thought I might have needed to because it sounds like a high dose (I administer Vitamin D tablets to some of my students and theirs are only 500 mg) but obviously not. Does anyone else on here take them and, if so, do they have much effect?