Low sperm count- now normal!

My husband did a SA and it was low (9 mil) we started seeing a specialist and he tested him again about a month later and said it is completely normal now. I asked if this happens often and he said it can. Anyways, my husband was taking supplements for the gym often when he got the low count, he stopped taking them and then his count changed. I’m not sure if this could have been the reason why or if it was just the sample, but it gives me hope! Anyone have a similar experience?