What do the key ingredients actually do in this formula?

Each component has a defined role in this leg balm:

• Horse chestnut extract (escins): the best-known cosmetic active for leg products; escin is associated with a toning effect on the vessel area and a fresher skin feel.
• Leech extract: a traditional ingredient in European leg-care cosmetics, historically chosen for products aimed at tired, heavy legs.
• Heparin sodium: commonly found in cooling gels and balms for local application; in cosmetics it contributes to the refreshing, light sensation.
• Menthol: provides the immediate cooling, fresh feeling that many people seek after a long day on their feet.
• Cypress and juniper essential oils: frequently used in massage products for legs; they support the sensory experience of the upward massage.
• Lemon oil: adds a bright, fresh top note to the fragrance profile.
• Niacinamide: helps maintain the skin barrier function, so with regular use the balm keeps the leg skin in good condition rather than drying it out.

The combination is designed for cosmetic care — cooling, toning sensation, and skin comfort — not for pharmacological action.