The recommended dose of Vitamin D is 1-2K this sounds a little low. I take 5k units and had my levels checked and they were spot on perfect. For any woman I'd say take Vitamin D from the age of 18 on 🙂 I was always short during menopause and then 2 years ago for some reason (probably me being cheap) I quit taking them all. And then I got cancer! I believe in supplements, exercise and a healthy diet. I will never stop taking my supplements from now on.