We found one RCT. The use of aromatherapy was compared with carrier oils alone in a randomised double-blind controlled trial over 7 months.39 Treatment with the essential oils cedarwood, lavender, thyme and rosemary oils massaged into the scalp every night was seen to be significantly more effective than treatment with carrier oil alone, with an improvement rate of 44%. While the patients were randomised, treatment groups were small and disease severity was not specified. This result awaits confirmation.
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