What does the card say about the lemon balm extract in these capsules? — Fish oil cap 300mg N100 Melissa - RealCaps ( melissa )(мелисса)

According to the card, the composition includes fish oil, the capsule shell (gelatin, glycerin, water) and lemon balm extract. Why the extract was added and what effect it has, the card does not explain; it describes the product as an additional source of omega-3 fatty acids (including eicosapentaenoic and docosahexaenoic acids) and of vitamins A and D.

General information (not a manufacturer's instruction): this is a food supplement, not a medicine; the omega-3 content is at least 17 % according to the card, and the card does not give the exact composition per capsule.