Both products are quite different, but they can absolutely be used in conjunction with each other.

Super Glow is designed to be used as a hydrating serum as part of your daily skincare routine, while also providing a gradual tan with every application. To receive the full benefits of our hyaluronic complex, the DHA percentage is lower in SUPER GLOW than our other facial self-tans, in order to make this suitable for everyday use without the color ever becoming too dark.
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Super Gloss, on the other hand, is not a self-tan, but an instant bronzing serum. This can be applied as the final step in your skincare routine, before make-up. Depending on how many drops you use this will either provide a light sun-kissed glow or a deeply bronzed tan. There are no tanning actives in this formula, so the color will be removed at the end of the day when you cleanse.