Hot peppers have Vitamin C and magnesium. They have antimicrobial properties too - I'm not sure, but it may be from the capsaicin itself. Not by coincidence, in places where the weather is hot and meat doesn't keep very long, people eat very spicy food.

Unfortunately, while there's been a lot of press about the nutrients in various plant foods, the antinutrients tend to get overlooked. All plant foods have both, and sometimes they are one and the same. Just as with pharmaceuticals, there are side effects and contraindications for medicinal plants.