Is black colloidal copper any good?

There is some evidence to suggest that black colloidal copper may have potential health benefits. For example, one study found that black colloidal copper may help to reduce inflammation and pain in the joints. Additionally, black colloidal copper has been shown to have antibacterial and antifungal properties, and may help to improve wound healing. However, it's important to note that the research on black colloidal copper is limited and more studies are needed to confirm its safety and efficacy. Additionally, black colloidal copper should be used with caution as it may cause side effects including skin irritation, vomiting, and diarrhea.