An overt multicentric study involving 115 patients and another subsequent placebo-controlled double-blind study involving 116 patients contributed significantly to the corroborative evidence of the antiviral activity in vitro of a specially prepared dried extract from Melissa leaves (Melissa officinalis L.) against herpes simplex infections. The studies provided the proof that the ingredient gave protection against herpes simplex infections. The initiation of the treatment in the very early stages of the infection revealed itself as most effective.
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