Incompatibility of Vitamin C (L-ascorbic acid) and Vitamin B3 (Safe-B3) in Toner Formulation for Oily Skin

Regarding the formula you inquired about and the information you provided about your skin type (very oily, especially the T-zone), the staff has already provided advice on the suitability of the formula.

In summary, the formula you proposed may not be suitable for your very oily skin type because it contains some ingredients that are oils or have high stickiness, which may make your skin even oilier.

The staff's recommendations for your skin are:

• The amount of Perfect-C should be reduced. Using only 2-3% may be sufficient.
• Vitamin E should be removed from the formula, or if necessary, used in a very small amount (recommended at 0.1%) as it is a very sticky oil.
• Soy Extract should be removed from the formula as it is quite sticky on the skin.
• The original formula focuses too much on adding moisture for very oily skin, such as using Vitamin B5 up to 5%.
• A suitable formula for your skin should focus on balancing skin oiliness. Anti-aging ingredients can still be used as usual.
• Additional ingredients that help balance skin oiliness are recommended, such as Zinc PCA, Safe-B3 (Vitamin B3), Licorice Extract (Licochalcone A 1%), which will help reduce oiliness in very oily areas and provide appropriate moisture to dry areas.

Regarding your follow-up question about mixing Vitamin C with Vitamin B3, the staff has confirmed that generally, Vitamin C cannot be mixed with Vitamin B3, and this includes L-ascorbic acid. Therefore, a toner containing both Safe-B3 and L-ascorbic acid cannot be made.