Article by: Perry Romanowski

Welcome to Day 16 of the 30 Days to Become a Better Cosmetic Chemist series

This 30 day challenge is all about giving you lessons and basic exercises that will improve your abilities as a cosmetic chemist. cosmetic patch test

Get your copy of the Become a Better Cosmetic Chemist workbook

In this episode

On today’s program we’re going to talk about the types of tests you need to do on your cosmetic formulas before you start marketing and selling it.

In this episode you’ll find:

  • The four types of tests you must run
  • Different kinds of microbial tests and what they do
  • More information about stability and safety testing
  • The reason you need to do performance and claims testing

 Today’s Challenge

Choose either one of your own products or a competitor’s product and make a list of all the tests that should have been done prior to launch.

Useful resources: or

Example: TRESemme Platinum Strength Strengthening Shampoo

Required tests – Stability testing, microbial challenge tests, claims testing

TAGS:30 days


  1. Avatar
    Endlex victor Okechukwu

    Thanks Perry.
    The 16 day lesson audio player didn’t finished playing, it played for 7:22mnts where as the it supposed to play for 14:21mnts

  2. Avatar

    Is there a company/lab you recommend to run these tests? I am launching a new product and what to make sure all the bases are covered.

    1. Avatar
      Perry Romanowski

      I would suggest you contact . They should be able to help.

  3. Avatar
    Yousuf shirvani

    All I have seen are the list of the course in your sight. I like to see a sample of real paragraph and video clip.

  4. Avatar

    Perri am very much interested in the lessons.
    I would also need your lesson books.

    Pls send me your email address then we can
    Chat Privately.

    1. Avatar
      Perry Romanowski

      Hello – you can get the lesson book by clicking on the link in this post.

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