Natural Calm & Rest Herbal Supplement Approved by Michael Tierra L.Ac, O.M.D For over 2,000 years, lemon balm has been used to calm the mind and take the edge off daily stress. Planetary Herbals Full Spectrum Lemon Balm contains the full range of compounds that occur in the plant naturally. Full Spectrum Lemon Balm is ideal for the temporary relief of normal everyday stress, occasional anxiety, and for promoting a calm, positive mood.