The study suggests that Ayurvedic formulations (including Aloe vera, turmeric), especially the combination of oral tablets and topical cream, can be effective in treating acne vulgaris with minimal side effects.
"The results were statistically analyzed and indicated that combination of use of internal and external preparation showed better efficacy as compared to the use of oral formulation alone. "
Lalla, J K et al. “Clinical trials of ayurvedic formulations in the treatment of acne vulgaris.” Journal of ethnopharmacology vol. 78,1 (2001): 99-102. doi:10.1016/s0378-8741(01)00323-3