Eye health does not have any direct studies on it despite its historical claims, although the one human intervention noted that 7.5% of the sample consuming 3g of the leaves daily claimed they had better eyesight; this study was blinded, and constitutes the only evidence for eye health claims. In a way it is promising (3g of the leaves themselves over 60 days improving eye health even when paricipants were unaware this could be an effect of treatment) but it does not constitute sufficient evidence in and of itself.