Formula Review and Mixing Steps Feedback

Regarding your revised gel formula for combination/slightly oily skin, targeting whitening, reducing dullness, reducing wrinkles, and lifting/firming, I have reviewed the formula and mixing steps.

Formula Adjustment:

• Ingredients: The ingredients you've chosen (Activated Resorcinol, Vitamin B3, N-Acetyl Glucosamine) are good choices for brightening and reducing dullness. DMAE is helpful for lifting and reducing wrinkles. Allantoin is a good addition for soothing the skin. Pro Polymer is an appropriate gelling agent for a gel formula.
• Using Oil-Soluble Activated Resorcinol: Your adjustment to use the oil-soluble Activated Resorcinol and dissolve it in 1,2-Hexanediol as a separate oil phase is correct.
• Percentages: The total percentage of ingredients in your revised formula is 100.2%, which is acceptable and very close to 100%.
• Concentrations: The concentrations of Activated Resorcinol at 1%, Vitamin B3 at 5%, and N-Acetyl Glucosamine at 4% are effective and suitable for use in skincare products.

Mixing Steps:

• Your proposed steps (Separating into water phase A and oil phase B, then combining): These steps are correct and suitable for mixing a formula with separate water and oil-soluble components. Dissolving the Activated Resorcinol in 1,2-Hexanediol before combining with the water phase will help ensure it is well dispersed.
• Adding DMAE Last: Following the staff's advice to add DMAE in the final step after the gel has formed is a good practice, as it can make gel formation easier.

Additional Recommendations:

1. Activated Resorcinol Solubility: As another user mentioned, you should test if 1% Activated Resorcinol fully dissolves in 3% 1,2-Hexanediol. If it does not dissolve completely, you may need to consider slightly increasing the percentage of 1,2-Hexanediol and reducing the water percentage accordingly to keep the total at 100%.
2. pH Adjustment: For optimal efficacy and stability of ingredients, particularly Vitamin B3 and Activated Resorcinol, and for skin compatibility, you should check and adjust the final pH of the gel to ideally be in the range of 5-6.
3. Preservation: Although 1,2-Hexanediol offers some preservative boosting properties, for DIY products, adding a suitable broad-spectrum preservative is highly recommended for safety and extended shelf life.

Overall, your revised formula and mixing steps are correct and appropriate for the ingredients you have. Just be sure to test the solubility of Activated Resorcinol in 1,2-Hexanediol and consider pH adjustment and preservation.

I will submit this answer for admin review.