I’ve been using this vitamin d for the last 3 years prior to that I was severely deficient and couldn’t get my vitamin d levels up despite working with my GP and endocrinologist. Ever since taking this my vitamin d levels returned to normal and even optimal at times. I find it helps with the seasonal depression. Speak to your healthcare provider to find the right dosage for you. It tastes lemony and I just do drops on the tongue after lunch. It’s really easy to use and the bottle lasts a long time.