Even I did not expect such an effect! Improve vision, not to say that dramatically, but still ... I'm 12 hours a day I spend at the computer, this is noticeable to me. The improvement observed after 2 weeks of reception. I periodically spent on drink and pierced vitamins of this group with our pharmacies, but did not think they affect the vision. And generally reserved for biotin propyl almost the whole bottle (there are still 1 day), every day 2 tablets right after dinner, resolving instead of candy, water is not washed down, like aftertaste. I do not know why they write that nasty taste. No. The taste is similar to any of our undevity, when will the sweet wrapper, only without the acid and feel stevia. Allergies, rashes, acne was not. I ordered a second jar, now I will repeat the course in spring and autumn. Useful to you my experience?