In general, I’m not going to be talking much about h&a products – it’s a separate company and I will only mention the company briefly. As for the bitters, they all work. Tto a great degree it depends on your preference and flavor profile. I would use the spiced bitters for people who have more gas. The bitter roots is, in my opinion useful for people who also have metabolic syndrome. Old World bitters is better for people who need bitters and have IBS, and the original bitters is my all-time favorite formula which I use the most.
Yes, the oat tincture is gluten free.