An investigation on how aromatherapy affects health failed to show any improvement in immune status, wound healing, or pain control among people exposed to two scents. But results of the randomized controlled trial, published in the journal Psychoneuroendocrinology, did show that lemon (considered to be a stimulant) appeared to enhance mood, while lavender (thought to be a relaxant) had no effect on mood.
Source: http://nccam.nih.gov/research/results/spotlight/040108.htm?nav=rss
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