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- If you want a concentration of 4% Niacinamide in 110g, you have to add 4.4 g of Niacinamide + 105.6 g of other ingredients, which will be exactly 110g, and you will get a concentration of 4% Niacinamide for 100g. As for the calculation method, you can compare it to the rule of three.

- Allow me to answer for you.

If using Based 100g, add another 10g of Active, the total amount = 110g if the information is correct as follows.

The amount of Tranexamic Acid will be approximately 2.72727% or 2.73%.