I've also had some headaches since I increased the dose from one 400mg capsule to two 400mg a day. Lately it's started to make my face feel flushed. I don't know if that's a common side effect and if it's more common in certain forms of the hard. For example I can take the KSM-66 version of Ashwaghanda and have no issues, however if I take the cheap GNC version it makes me feel like I'm going to throw up. I'd like to take a version of Tongkat Ali because it has increase my strength a bit. I went from not curling in over a year and having a poor diet due to surgery, to curling 40 pounds in 3 weeks with strict form.