As with all natural products, remember the golden rule. Gentle and SLOW. That means that if a commercial dewormer would have sorted out intestinal worms all on one day, you will need to budget a week to give the natural counterparts time to gently and slowly do its work.
MSM is found in fruit and vegetables, but some times we need more of it, especially in the case of a compromised immune system, e.g. when there is sickness, lack of sleep, poor diet, lack of exercise or stress.