Unfortunately, there is no general answer to this question, as it depends very much on the individual case (age, weight, constitution, workload) and the desired result: If your horse is already well trained and only needs to be actively supported in building muscle with MUSTAX M+, you should notice an increase in rideability and a shortening of the release phase after just 7 to 10 days. After 4 to 6 weeks, changes in the muscles will be visible to the naked eye. However, if your horse is convalescing after colic surgery, for example, as a result of which it has lost a lot of weight and needs to be gently fed again, it can of course take a few months for your horse to regain its old form.