Vitamin C serum: 10% vs 20% and how to choose
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Helen Hunt Skin offers two vitamin C strengths. C Glow contains 10% ascorbic acid in a lightweight formula described for younger, oily skin. C Glow +20 contains 20% L-ascorbic acid with ferulic acid. Both are serum steps; you do not need to layer them together.
Which strength should I choose?
If you are new to vitamin C or prefer a lighter option, begin by looking at C Glow. If you already use vitamin C comfortably and want the 20% formulation, consider C Glow +20. Skin tolerance, product formulation and how consistently you use it matter more than simply choosing the largest number. Introduce a new active gradually and follow its label.
How does vitamin C fit into a routine?
In the morning, cleanse, use your chosen vitamin C serum as directed, moisturise if needed and finish with broad-spectrum Defence 50 facial SPF. Vitamin C is not a sunscreen substitute. The morning routine guide shows the full order.
What can vitamin C do?
Topical vitamin C is used for antioxidant support and the appearance of dullness and uneven tone. Results depend on the finished formulation and the individual; ingredient research alone does not prove a particular product's numerical efficacy claim.
Compare both options in the Vitamin C collection.
Source
By Helen Hunt Skin editorial team. Reviewed 29 September 2026. General cosmetic information.