I know this helps the soil for tomatoes and since they are in the same family, should I add some to the soil?
Epsom is great for peppers provided your soil needs it.
Definitely if new leaves are curling or foliage is pale.
In past years, I've sprayed all the leaves everyday for a week (1 tsp per quart of water) when needed, but this year I have more plants so if I see new growth curling, I'm going to add epsom salt to the watering can. Hadn't thought to add to the soil. Will research it.