Using power capsules for body building is very common. Steroids
are common content in these power capsule.
Now the important thing is to understand is that using steroids for long term and that too without the consultation with any doctor and in high dose can lead to side effects, which can involve fertility
But if you are using these in a very limited and controlled way for muscle building than it would not affect fertility or produces side effects.
If you have any confusion and not sure about wether this has done something wrong with your fertility, than I would suggest you to consult some doctor and make confirm this as this can lead to anxiety
which has a very significant effect on fertility.
Thanks and take care.