Evaluation of Your Formula for Sensitive, Acne-Prone Skin

Based on the ingredients in your formula and information about them:

• Risk of Clogging: The ingredients in your formula are generally not known to clog pores. As confirmed by the staff reply, this formula is unlikely to cause clogged pores.
• Risk of Irritation/Sensitivity: While the ingredients like Alpha Arbutin, Hyaluronic Acid, and Phenoxyethanol (Extra Pure grade) are generally considered safe and well-tolerated, sensitive skin can react to anything. Alpha Arbutin at 2% is a standard and effective concentration for brightening. Hyaluronic Acid provides hydration, which is beneficial for all skin types. Phenoxyethanol is a common preservative used at a safe concentration. However, individual skin sensitivity varies. It is highly recommended to perform a patch test on a small area, like behind the ear or on the inner arm, before applying it to your face, as also advised by the staff.
• Effectiveness for Acne Marks and Dark Spots: The formula contains Alpha Arbutin at 2%, which is an effective ingredient for reducing the appearance of acne marks and dark spots by targeting melanin production. Hyaluronic Acid can help improve overall skin texture and hydration, which can complement the brightening effect.

Regarding the stickiness mentioned by the staff, this is a common characteristic of formulas with higher concentrations of Hyaluronic Acid, especially on oily skin. It doesn't necessarily mean it will cause acne or clogging, but it's a textural consideration.

Adding Reservoir-Tech at 3%

Adding Reservoir-Tech at 3% is within its recommended usage rate (2.5-5.0%). Reservoir-Tech is designed to help active ingredients penetrate the skin and be released gradually over time.

• Potential Benefits: For water-soluble ingredients like Alpha Arbutin and Hyaluronic Acid, adding Reservoir-Tech could potentially enhance their effectiveness and provide a more sustained benefit. It can also help reduce potential irritation by controlling the rate of absorption, although Alpha Arbutin is generally not highly irritating.
• Important Note: The product information for Reservoir-Tech strongly recommends performing a patch test for at least 28 days when using it with any ingredient to verify its effect and safety on your skin before applying it more widely or using it in products for sale.

In summary, your base formula is unlikely to cause clogging and contains an effective ingredient for dark spots. The risk of irritation is relatively low but depends on your individual sensitivity, making patch testing essential. Adding Reservoir-Tech at 3% could potentially boost the formula's effectiveness, but requires careful patch testing over a longer period (28 days) as per the product's recommendation.