Adding Vitamin B3 to Existing Cream and Concentration Calculation
คำถาม
I have an existing cream base (100g) and want to add Safe-B3 (Vitamin B3) to achieve a 4% concentration. I know the correct way is to mix 4g of Safe-B3 with 96g of cream, but it's inconvenient to measure out exactly 96g from my 100g. Is it acceptable to add 4g of Safe-B3 directly to the full 100g of cream? If so, what would be the resulting concentration of Vitamin B3?
คำตอบ
Regarding adding active ingredients to a finished cream base:
You are correct that to achieve a final concentration of 4% Vitamin B3 in a total of 100g of product, you would need to mix 4g of Vitamin B3 with 96g of your cream base.
However, as you noted, measuring exactly 96g from your existing 100g can be inconvenient. The staff's recommendation provides a practical solution.
If you add 4g of Vitamin B3 directly to your full 100g of cream, the total weight of the mixture will be 100g + 4g = 104g.
The concentration of Vitamin B3 in this new mixture will be calculated as:
(Weight of Vitamin B3 / Total weight of mixture) * 100%
(4g / 104g) * 100% ≈ 3.84%
As the staff explained, this results in a concentration slightly lower than your target of 4%. However, this difference is minimal and the resulting concentration of 3.84% is perfectly acceptable and safe for use. Using a slightly lower concentration is generally safer than accidentally exceeding the recommended maximum usage rate.
Therefore, adding 4g of Vitamin B3 to your 100g of existing cream is a practical and recommended method to achieve a concentration very close to your desired 4%.
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