A everyday serum featuring tetrahexyldecyl ascorbate, a stabilized, low irritation form of vitamin C. Suitable for all skin types, C-Tetra is ideal for those new to vitamin C. Tetrahexyldecyl ascorbate is an oil-soluble, super-stable form of vitamin C which retains its power throughout its use. The vitamin C is combined with co-antioxidant vitamin E. C-Tetra helps to promote a visibly brighter complexion while reducing the appearance of skin aging signs. The lightweight, jojoba-based formula with a fresh citrus scent sinks in rapidly, leaving skin looking refreshed. Medik8 recommend a simple, effective skincare strategy of using vitamin C and sunscreen in the morning and vitamin A at night. This strategy is called: CSA. Dermstore has partnered with Flex to allow you to use your Health Savings Account (HSA) or Flexible Spending Account (FSA). This means you can now use your HSA or FSA debit card to buy Medik8 products with pre-tax dollars, resulting in net savings of 30-40%, depending on your tax bracket. Eligible for HSA/FSA with a letter of medical necessity at checkout. From dermatologist-recommended treatments to solutions for chronic skin conditions like acne, eczema, and rosacea, these products are both effective and eligible. | Medik8 C-Tetra Serum, 30 ml | Dermstore