The present invention relates to a cosmetic, nutraceutical or dermatological composition for treating or preventing acne, comprising a peptide and oside extract of Schizandra fruit and a suitable excipient. Preferably, the extract is obtained from Schizandra sphenanthera. The composition may also comprise at least one anti-acne agent selected from a sebum-regulating agent, an antibacterial and/or antifungal agent, a keratolytic agent and/or a keratoregulating agent, an astringent, an anti-inflammatory and/or anti-irritant, an antioxidant and/or a free-radical scavenger, a cicatrizing agent, an anti-ageing agent and a moisturizing agent. The invention also relates to a method for cosmetic treatment of acne, characterized in that a cosmetic composition according to the invention is applied to the affected areas of the skin, or in that the affected individual takes a nutraceutical composition according to the invention orally.