Thank you @bigtom13!! for your kindly and truly comment!
Well, green tea is amazing! its properties are super popular! But I read once that the recommended dose is up to 0.75l. Do a little research, you find a lot more information in english. But...if this works for you, then go for it! Every body works different!

I never heard of brown tea before. But I use rosemary for my hair from time to time, whenever I have the time!