Topical aloe vera vs. placebo in psoriasis patients: symptoms decreased in 72.5% of the Aloe vera-treated sites compared with 82.5% of the placebo-treated areas, which was statistically significant in favour of the placebo treatment (Probability = 0.0197).
Ooops!
The authors speculate that the aloe 72.5% figure might actually be a placebo effect too, since the placebo performed so well.
Psoriasis study