Serum Formulation Review

Your proposed serum formulation is well-rounded and aligns with your goals of whitening, skin regeneration, and addressing oily/combination skin concerns. As the staff mentioned, the formula primarily focuses on whitening and supporting skin structure/cell health, providing hydration indirectly.

Here's a breakdown of the key ingredients and their roles:

• GlucoBright (Acetyl Glucosamine) 4% + Safe-B3 (Vitamin B3, Niacinamide) 5%: This combination is excellent for whitening and reducing dark spots. It also helps stimulate the skin's natural production of Hyaluronic Acid for moisture, offers gentle exfoliation, and can help reduce acne breakouts.
• Alpha Arbutin 2%: Works to brighten the skin and create a more even tone by reducing melanin production.
• Licorice Extract (Licochalcone A) 1.0%: Known for its ability to reduce skin inflammation, redness, irritation, and control oiliness, which is beneficial for oily/combination and acne-prone skin.
• Matrixyl 3000 8%: A peptide blend that helps stimulate collagen synthesis, reduce wrinkles, and improve skin elasticity.
• Apple Stem Cell Extract 5%: Aims to nourish skin cells, extend their life, and help slow down the skin's aging process to maintain a youthful appearance.

Regarding hydration, the current formula provides some moisture, which is often sufficient for oily/combination skin. However, if your skin is oily/combination but also experiences dehydration, you could consider adding Panthenol (Vitamin B5) at around 3% as suggested by the staff. Vitamin B5 acts as a humectant, helping the skin retain moisture, and also aids in wound healing and reducing inflammation.

To see visible results from this serum, consistent use is important, typically for at least 28 days, which is the skin's natural cell turnover cycle.

Overall, your formula is comprehensive for your stated goals. The inclusion of Vitamin B5 is a good optional adjustment if you feel your skin needs additional hydration.