Capsicum is king. How wonderful, for him! He should start making the tincture, 9or actually cayenne oil might be better) and maybe just eating the powder.
Then there's kimchi--when he gets back from his vacation, you might suggest he looks into making his own--check out Erik Armstrong's Ultimate kimchi tutorial, online. Such in to make. >>> Home-grown probiotics, lots of cayenne, alkalizing minerals--you've got all the stuff the body needs to heal!!!!!
My sense o the quick response is, it's showing how much he'd benefit from a plant-based diet. The capsicum goes to work fast.