[FormBishop]

Belassi said:

Peppermint is a very strong EO and its aroma will drown any other EO. A level of 0.2% will definitely be felt by your mucous membranes. I recommend you start with a very low level, perhaps 0.05%. When using EOs, fragrance oils in addition are not in general a good idea.

Thank you! This helps a lot. Is the addition of a fragrance oil not a good idea because the oil blend will be applied to the scalp?

[FormBishop]

lewhitak said:

For me, I would put together a general list of what you would like to include and then you build on this list. 

Put together a spreadsheet or something where you can see all of your information at a glance. 

You’ll want to list:
Pricing
Shelf Life
Purported Effect
Usage Levels
IFRA guidelines/Safety/etc (IFRA = Internation Fragrance Association)

You can also include tabs in your spreadsheet to show each version you’ve done and your notes for that version. 

Then, test each individual oil alone on your substrate and write down what you notice. Based on that, put together your first blend and add your fragrances and the PEG according to the supplier’s recommendations and the guidelines from IFRA for leave-on products. 

Thanks! A spreadsheet is a great idea. I’ll try that out.

[FormBishop]

Belassi said:

2% peppermint oil? If you get that in your eyes you will think it’s pepper spray.

Thanks! Now I know that 2% is too much. I’m really new to this and I’m not a chemist. This is why I’m asking professionals for an example or a recommendation on the appropriate amount. I don’t want to do anything that can be harmful or unsafe.

[FormBishop]

Thanks for your response. Sorry, I didn’t mean that I wanted someone to create a formula for me. I was just looking for an example. I’m planning on adding peppermint and rosemary oil for growth stimulation. I’m just not sure what percent I should add. I don’t want to go over the recommended amount. 

Is it okay to do a formula with carrier oils that are all equal parts, with essential oils having a lower percent?

Kind of like this:
    Avocado oil: 22%
    Grapeseed oil: 22%
    babassu oil: 22%
    sweet almond oil: 22%
    apricot oil: 7.5%
    peppermint oil: 2%
    Rosemary oil: 2%
    Fragrance oil: 0.5%