I got pure BH4 from another site. I can give you the name if you want, forget off the top of my head. I took 5mg bh4. Seemed like really smooth energy.\nYes, please. I'd like to know where one can get it. I had thought it was not available on the US market, except for the $4,000 a month orphan drug, Kuvan. There used to be a $90 supplement which was pulled from the market due to the Kuvan patent.\n\nDid you take it for peroxynitrites?