Most online supplement retailers will have all types of magnesium, for sure ALA (alpha lipoic acid), and PEA ( a fatty acid). Not sure i can recommend one brand over another. Lot of people in our TC forum use Mirica PEA. I use Natural Factors. I can't for sure say it's helped a ton yet, but here it takes a few weeks to notice an effect. Lot of good brands ALA out there. I use dr's best. Jarrow is usually good or NOW brand. Cramp bark is a bit harder to find. Might need to find some bulk herb supplier. It's part of many women's monthly cycle help formulations as it helps menstrual cramping, but I've found it good for general muscle tightness. Leg muscle cramping at night could be a mineral imbalance too..make sure you get potassium, magnesium in balance. There are also magnesium lotions you could rub on cramping areas. Or using epsom salts in a bath. I use herbs like valerian, kava, black cohosh, st johns wort, skullcap also for nerve pain. You can research a bit online for more info on these. They each work a little differently. Of course always make sure to use cautiously if you're on prescriptions meds. There can be interactions. I've tried CBD also internally, but haven't gotten as much help from that. Everyone is different. Hope that some of this may be helpful to you! I've suffered with chronic pain for many many years and can't tolerate most Rx drugs or suffered terrible side effects from them. So I had to teach myself what natural remedies are out there and use trial and error. I don't know as much about ayurvedic (Indian) or Chinese herbal medicines, but they are out there too. And there are many manual physical therapies most people don't know about that can be helpful too.

A word of caution: it would be wise to discuss any supplements you plan to take, for multiple reasons, not the least of which is possible interactions with medication you're already taking. A conversation with the pharmacist is a good option, as well.

Jim