I was recommended Black Seed Oil as a means to combat some of the more debilitating symptoms of Hashimotos. I haven't experienced any negative side effects. Alleged Health Benefits: Healthy joints and mobility Concentration and focus Nervous system function Heart and healthy blood pressure levels† Healthy liver, prostate, breast, kidney, and thyroid Stomach and digestive tract health Proper cellular development and DNA replication Robust immune defenses* Pros: Non GMO Free of artificial coloring, flavoring, preservatives. Free of soy, gluten, wheat, and dairy. Quality ingredients Cost- $30 for 2 mo supply* *If taken once daily: Cons: Strong-can cause stomach upset. Natural ingredients may cause allergic reaction.