Stabilized Vitamin C (Natural-C Glycol™) Serum Usage

Regarding your question about Stabilized Vitamin C (Natural-C Glycol™) Serum:

1. Can it be applied directly?
   Yes, as the staff mentioned, this product is designed to be used directly as a finished serum product. It does not require further mixing before application.

2. Special instructions for gel vs. liquid cream?
   The product itself is a liquid serum. It is formulated to be used at 100% concentration as a finished product. It is not intended for users to mix into their own gel or cream bases. The product description indicates it is suitable for use in various product types like gels, serums, lotions, or creams, but this refers to how manufacturers might formulate products using this ingredient, not how a user should mix it at home. Adding other ingredients to the serum is generally not recommended as it may affect stability, except for fragrance (up to 1%) and coloring.

If you intend to sell this product, it must be registered with the FDA as a finished cosmetic product.