Preservative percent usage

Hey 
I am using 75% dm water in my shampoo and 85% in lotion, keeping these percentages in mind how much percent dmdmh shall I use in both.
Thanks in advance 

Comments

  • ozgirlozgirl Member, PCF student
    The amount of a preservative used is a percentage of the total formulation. Usage is not based on the amount of water.

    Check with your supplier on recommended usage rates.

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