Serum Formulation: Adding Delentigo and Ingredient Compatibility with Sun Exposure Concerns

Based on the search for information on the ingredients in your serum formulation, including "Delentigo," the tools available did not find specific information about "Delentigo." Therefore, I cannot provide a specific recommendation on whether you can add Delentigo 5% to your formula or what potential negative effects might occur.

However, based on the information found for the other ingredients, I can provide the following details about the components you have in your formula:

• Azelaic Acid (Liquid Azelaic™): It has good properties for brightening skin, reducing dark spots, and controlling skin oiliness. It causes slight exfoliation, so avoiding strong sunlight is recommended during use as the skin may become more sensitive to light. This aligns with the previous advice you received. If you find it difficult to avoid sun exposure, considering removing Azelaic Acid is a good option.
• Tranexamic Acid (Trans-White™): It helps brighten skin and reduces melanin formation, suitable for freckles and dark spots caused by sunlight. It can be used in cosmetics up to a maximum of 3%.
• Alpha Arbutin (Switzerland): This ingredient helps brighten skin and reduces melanin production by inhibiting the Tyrosinase enzyme. It is considered a safe and effective substance for evening out skin tone. It is recommended for use at concentrations of 0.2-2%, not exceeding 2%. It is a good alternative if you wish to avoid Azelaic Acid, as it is less photosensitizing.
• Vitamin B3 (Safe-B3™): Also known as Niacinamide, it helps reduce redness/dark spots (hyperpigmentation), adds moisture, strengthens the skin barrier, and can reduce facial oiliness. It can be used up to 10%.
• Phenoxyethanol (Extra Pure): This is a safe preservative used to prevent microbial growth in the formula.

Since no information was found for Delentigo, I cannot confirm its compatibility or potential effects when mixed with the other ingredients in your specific formula.