In the blood test, it was found that I had a vitamin D deficiency, which is why I was looking for an equivalent drug. I was important, that this is a vegan preparation! My brother told me then recommended the tablets of Vitabay, and after 2 weeks of high-dose ingestion I have achieved an excellent value of 67 ng / ml, according to a re-performed blood test. Since the tablets are tiny, there was no problem, several to swallow at once. Meanwhile, however, I swallow course only 1 day in order to maintain the good value. I feel completely different, since I have enough Vitamin D! Finally, I am no longer constantly tired !!!!