Conclusions
Bauhinia microstachya var. massambabensis leaf extracts (EtOHAC and WAc) were successfully incorporated into O/W emulsions containing sunscreens. The photoprotective formulations containing extracts were photostable after irradiation in the solar simulator, thus the extracts did not contribute to sunscreen’s photodegradation when exposed to UV radiation. Concerning the
efficacy tests, all formulations presented a suitable SPF and both plant extracts contributed to a higher photoprotective effect, as an enhancement in the in vivo SPF, when the extracts were added to the formulations. It is suggested that plant extracts acted by capturing ROS, thus minimizing erythema and collaborating indirectly to in vivo SPF enhancement. Both formulations could be considered safe for cosmetic use since they passed the toxicity tests, demonstrating that they are not irritant to the eyes and skin.