yes, there is many health benefits of taking green tea but if you get nausea while taking green tea you can try for oolong tea this tea is the best substitute of green tea and oolong tea infused with great sweetness it also reduces chronic health conditions such as diseases of the heart, inflammatory disorders and high levels of cholesterol and also provides many necessary antioxidants which promotes superior bone structure, robust skin and good dental health. So if you get a headache from green tea you can buy oolong tea from here: http://www.saffroncup.com/tea/oolong