Toner Formulation Suitability

Thank you for your inquiry regarding the toner formulation you wish to create.

Based on the formula you provided, here are some points to consider and recommendations:

Formulation Consideration

1. Total Percentage: The total percentage of the ingredients you listed is 102%, which exceeds 100%. In cosmetic formulations, the total percentage of all ingredients must equal exactly 100%. The remaining portion is typically the base, such as water. You will need to adjust the percentages of some ingredients downwards so that the total sums to 100%, and add water as the remaining part.
2. Preservative: The last ingredient you listed is "สารกันเสีย" (preservative) at 1%, but the specific type of preservative is not mentioned. Choosing a preservative that is suitable for the formula, effective in the final pH range, and compatible with all other ingredients is very important. You should check the information for the specific preservative you plan to use to ensure it is appropriate for this toner formula and what its recommended usage rate is.

3. Ingredients and Usage Rates:

   • Witch Hazel Plus Allantoin (70%): This is a relatively high concentration, but it is within the recommended range for toners (10-100%, recommended >50% for toner). It helps with pore tightening and soothing the skin. It should be mixed in the final step at a temperature not exceeding 40°C.
   • Skin-mimic™ (Skin Barrier Restoration) (13%): This is a higher usage rate than the general recommendation (recommended 1-15%, 5% for general, 10% for dry skin, 15% for problematic/allergic/irritated skin), which is suitable for skin with impaired barrier function. It helps restore the skin barrier. It can be dispersed in water (may make the formula cloudy).
   • Calendula Extract (Water Soluble) (5%): This is the maximum recommended usage rate (1-5%). It has properties that help reduce inflammation, reduce redness from acne, and increase moisture, suitable for sensitive skin.
   • Vitamin B6 (Pyridoxine Hydrochloride) (3%): This is the maximum recommended usage rate (0.5-3.0%, recommended 2%). Its key properties are oil control and pore tightening (for oily skin). Vitamin B6 has a low pH (2-3) and is unstable at pH above 6, as well as being sensitive to heat and light. It should be mixed in the final step at a temperature not exceeding 40°C and avoid light.
   • Japanese Cedar (Cryptomeria Japonica Bud Extract) (3%): This is the maximum recommended usage rate (1-3%, recommended 1%). It helps enhance new skin cell creation, restore skin barrier strength, improve skin smoothness and hydration. Continuous use for at least 30 days is recommended for clear results.
   • Double Hyaluron Liquid (5%): This is a recommended usage rate for normal to dry skin (recommended 1-20%, 3-5% for normal skin, 5-10% for dry skin). It helps provide moisture to both the lower and upper skin layers.
   • Vitamin B8 (Inositol) (2%): This is the recommended usage rate (1-3%, recommended 2%). It helps balance skin moisture, suitable for both oily and dry skin.

4. Compatibility and pH: Several ingredients have recommended pH ranges for efficacy or stability (e.g., Vitamin B6 pH 2-6, Japanese Cedar pH 3.5-6.5, Double Hyaluron pH 3-9, Vitamin B8 pH 4-7, Calendula pH 5.5-6.5, Witch Hazel pH 3.8-4.5). Vitamin B6, in particular, has a low pH and will lower the formula's pH. You should measure the pH of the final formula and adjust it to be within a suitable range for all ingredients. Toners typically have a slightly acidic pH, often in the range of 4.5-6.0. You should be mindful of Vitamin B6's stability if the final pH is above 6.

5. Storage: Several ingredients (Calendula, Vitamin B6, Japanese Cedar, Double Hyaluron, Vitamin B8, Skin-mimic) recommend refrigeration for long-term storage to maintain quality. Therefore, the finished product should also be stored in the refrigerator.

Recommendation

The formula you proposed contains good ingredients that address hydration, skin barrier restoration, oil control, soothing, and anti-aging, which are suitable for a toner formulation. However, there are points that need adjustment:

1. Adjust the total percentage to 100% by reducing some ingredient percentages and adding water as the remaining part.
2. Choose an appropriate preservative that is compatible with other ingredients and effective in the final pH range of the formula.
3. Consider the mixing method, especially for ingredients sensitive to heat and light (Vitamin B6, Witch Hazel Plus Allantoin). These should be added in the cool-down phase below 40°C, and Vitamin B6 should also avoid light.
4. Check and adjust the pH of the final formula to be within a suitable range for all ingredients to ensure their efficacy and stability.
5. It is recommended to store the finished product in the refrigerator to maintain the quality of the ingredients.

If you adjust the formula according to the recommendations above, this toner formula should be suitable and effective.