This post is a work in process. It is to be updated and completed in a future article.
To improve sluggish digestion, you could try digestive enzymes. This is not to endorse these supplements nor this company, but a list of frequently asked questions about enzymes is here. A summary of “Enzyme Nutrition” by Dr. Edward Howell MD is here. For details, read the book.
He shou wu (Polygonum multiflorum), also known as Fo Ti, is called the king of herbs. He shou wu can have a lot of zinc in it, depending on the soil it came from and the batch. The roots are harvested. Good quality is obtained with a process that includes cooking the roots with black beans (and only then drying and making powder). Among other uses, it is thought to be healthy for the hair, nails, and skin. I often add half a teaspoon (two grams) to smoothies.
Published research also indicates the utility of CBD to relieve various conditions.