AQUASOURCE gel 75 ml AQUASOURCE gel 75 ml AQUASOURCE gel is a lightweight, water-based gel moisturizer that helps to instantly hydrate and replenish skin with long-lasting moisture. Formulated with Biotherm's unique Life Plankton™, AQUASOURCE helps to protect the skin barrier and reinforce skin’s natural defense. This gel is ideal for combination to oily skin types and helps to leave skin looking and feeling softer, smoother, and more refreshed.