Formulation for Acne-Prone Skin (Oily vs. Dry) and Mixing Hydroxyethyl Cellulose Gel

Okay, I can help summarize the mixing instructions based on the staff's advice and address your question about the first formula for dry skin.

Here is a summary of the mixing steps for your revised formula and the suitability of the first formula for dry skin:

Revised Formula Mixing Steps:

Based on the staff's guidance, here are the steps to mix your revised formula (assuming you include Phenoxyethanol as a preservative and adjust Allantoin as recommended):

Revised Formula Composition:

• Encap BHA 3.3% (ID: 229)
• Vitamin B12 2% (ID: 328)
• Zinc PCA 1% (ID: 252)
• Allantoin 0.2% (ID: 75) - Adjusted based on staff recommendation
• Quercetin 3% (ID: 358)
• Hydroxyethyl Cellulose 0.5% (ID: 336)
• Phenoxyethanol 0.5% (ID: 155) - Added as a standard preservative
• Water 89.5% (ID: 838) - Calculated to reach 100%
• Total: 100%

Mixing Steps:

1. Prepare the gel base: Disperse Hydroxyethyl Cellulose (0.5%) in the required amount of hot water (part of the 89.5%).
2. Cool the gel base: Let the mixture cool down for about 10 minutes.
3. Complete the gel base: Add the remaining cold water to the mixture and stir until the gel base is uniform.
4. Add other ingredients: Add the other ingredients (Encap BHA, Vitamin B12, Zinc PCA, Allantoin, Quercetin, Phenoxyethanol) to the prepared gel base. You can dissolve them in a small amount of water first if needed, or add them directly to the gel base.
5. Mix thoroughly: Stir the mixture until all ingredients are completely dissolved and evenly distributed in the gel.

Suitability of the First Formula for Dry, Acne-Prone, Sensitive Skin:

Regarding your question about using the first formula for someone with acne but dry and sensitive skin, the staff confirmed that the first formula is indeed more suitable for dry skin compared to the revised formula. This is because the first formula contains moisturizing ingredients like Glycerin, Sodium PCA, and Natural Moisturizing Amino Acid, which are beneficial for dry skin. The revised formula includes Zinc PCA, which is more focused on oil control and less suitable for dry skin.

Keep in mind the staff's points about Quercetin: it will give the serum a dark yellow color and is best used at night because of this color. Also, the staff advised that Allantoin should be used at a maximum of 0.5% of the water amount, suggesting 0.2% of the total formula for easier calculation if you decide to add it to the first formula.