Da sapropterindihydrochlorid er en syntetisk version af det naturligt forekommende 6R- BH4, må det rimeligvis kunne antages at metaboliseres på samme vis, inklusive 6R- BH4- regeneration.
Since sapropterin dihydrochloride is a synthetic version of the naturally occurring 6R-BH4, it can be reasonably anticipated to undergo the same metabolism, including 6R-BH4 regeneration.