I must share the standard disclaimer that I am not a doctor and cannot give out medical advice. Crystals for healing should be used as a compliment to other therapies and not as a replacement for regular medical care.
This list assist in healing nerve damage. I would try the Amazonite, Chrysoprase and Manganocalcite first as i feel the may have the best energy for what you are looking for. For the circulation I would suggest Bloodstone, Natural copper, Red Jasper as the all assist in removing blood blockages and improve circulation. Bloodstone healsnot just the blood, blood pressure and circulation it heals tissue and boost immune system. Copper is good for preventing clots and increaseing blood flow. It will also improve the joint flexability.
Copper-increases blood flow
Chrysoprase-system cell rejuvenation
Hedenbergite-heals at cellular level
Manganocalcite-heals at cellular level
Look this list over, not all of them will be right for your friend. Let him look at the list, he will see something that will resonate with him, and he will know it is right. I hope for the best outcome possible for your friend.
Master crystal Healer
"Privacy Statement: To help others learn, we typically post questions like yours to our online database of articles about crystal healing. We only use first names and take care to remove all last names and email addresses. If you prefer that we not post your first name or if you would prefer if we not to post your question at all, please let us know and we'll be happy to accommodate your request for privacy."