Re: Schisandra and Hashimoto's Thyroiditis
I am confused by your post. You say you have Hashimoto's, but also say that you are borderline hyperthyroid. But Hashimoto's leads to hypothyroidism, not hyperthyroidism. Hashimoto's is an autoimmune condition though and the most common cause of thyrotoxicosis is uncontrolled Grave's disease, another autoimmune condition. It is possible to hyper and hypo thyroid at the same time, but this is extremely rare.
As for the ashwagandha, I seriously doubt that this had anything to do with the thyrotoxicosis. There are several reasons that this can occur, which again includes uncontrolled Grave's or thyroid inflammation. Ashwagandha will not cause either one.
As for schisandra, it does contain immune stimulating polysaccharides that should be limited in cases of autoimmunity. I love schisandra as an adaptogen, but I would combine it with other adaptogens without high levels of polysaccharides. Licorice root and jiaogulan would be excellent choices.