It is nice that you want to help but in all honesty, just understanding of SI is help enough for me. My husband understands why I SI. He never says anything to me about it because it has been how I cope since I was a young teen. If I can find something to replace it then I would but I have not found anything yet. As for your friends just make sure they stay safe. Offer an ear but understand and don't push when your ear is not enough and they turn to SI. I hope your friends stay safe and good luck to you. I know it is hard to not say anything about it but in my case it would be the best thing.