Formula Evaluation for Serum

This formula contains several beneficial ingredients for a serum. Let's look at each component:

• Dermal Respiratory Factor (PiteraEx): Known for its anti-aging and wrinkle-reducing properties.
• Ectoine: A multi-functional ingredient that protects and repairs skin cells, provides anti-aging, anti-irritation, moisturizing, and anti-pollution benefits. It is generally well-tolerated.
• Methylsilanol Mannuronate: Primarily used for firming and lifting the skin.
• Repair Activator (Bifida Ferment Lysate): Helps repair skin DNA damage and offers anti-aging effects.
• DMI (Dimethyl Isosorbide): Acts as a penetration enhancer, helping the active ingredients absorb better into the skin.
• Mild Preserved Eco: A gentle preservative alternative to keep the product stable.
• Water: The base of the serum.

Ingredients requiring clarification or caution:

• Hybrid Cell: A specific product with this name was not clearly identified from the search results. The intended ingredient and its function in the formula are unclear.
• Yeast Resurface: Based on the name and link, this likely refers to a type of Yeast Extract. Different yeast extracts can have varying properties, such as skin renewal, moisturizing, or balancing. Without knowing the specific type, its exact contribution and suitability, especially for acne-prone skin, are difficult to assess. Some exfoliating yeast extracts might cause irritation.
• propolymer (Acrylate Crosspolymer): The product identified (Allianz OPT) is a film former providing water and wear resistance, not a primary thickener as suggested by the category in your link. At 0.5%, it may offer some textural benefits or light film-forming, but if significant thickening is desired, a different ingredient or higher concentration might be needed.
• Essential Oil: Including 1% Essential Oil in a facial serum, especially for combination skin with occasional acne, can be problematic. Essential oils can be irritating and potentially clog pores depending on the type. It is generally recommended to use a much lower concentration (e.g., 0.1-0.2%) or use a cosmetic-grade fragrance oil if scent is desired, particularly for sensitive or acne-prone skin.

Suitability for Combination Skin with Occasional Acne

The formula contains ingredients like Ectoine and Repair Activator that can help soothe and support the skin barrier, which is beneficial for acne-prone skin. The anti-aging and firming ingredients are generally compatible. However, the Essential Oil is a significant concern due to the risk of irritation and potential to worsen acne. If "Yeast Resurface" is an exfoliating type, it could also potentially cause irritation.

Suitability for All Skin Types

This formula is not suitable for all skin types primarily due to the inclusion of 1% Essential Oil, which can cause sensitization and irritation in many individuals, especially those with sensitive skin. The potential for irritation from the Essential Oil and possibly the "Yeast Resurface" ingredient makes it unsuitable for universal use.

Recommendations

• Identify the specific "Hybrid Cell" and "Yeast Resurface" products you intend to use to understand their exact properties and suitability.
• Strongly recommend reducing or removing the Essential Oil. If a scent is desired, use a very low concentration (0.1% max) of a skin-safe fragrance oil, or omit fragrance entirely for sensitive skin.
• If you want the serum to be thicker, consider using a different thickener or adjusting the concentration of the acrylate crosspolymer if its description indicates thickening properties at higher concentrations (though the description for Allianz OPT suggests it doesn't impart significant viscosity).
• Perform a patch test before applying the serum to your face, especially given the combination of active ingredients and the presence of essential oil.