I have relatively long hair and I always used Ultrex. However, in the last 4 months, when I turned 35, I experienced quite a significant hair loss, in general (not baldness).
However, for the past 2 months that I have been using this specific shampoo, I have seen results from the first use. Hair loss has now decreased by 80%. I tried using Ultrex again in between, and the hair started falling out again like before. So, I conclude that it does the job. Now I have returned to normal levels.
Of course, this does not mean that all cases are the same because if it were that simple, everyone would have hair again. It's just worth trying, even if it costs 10 euros and lasts for a long time!