Are you using this mix on just your scalp or both (scalp and hair length)?
If just the scalp....the type of oils and powders look fine....however scale the measurements of the powders to 1 teaspoon each. The mixture will be very potent if you leave as is and will probably need to be diluted with a ton of oil once you finish infusing. If any of the powders are new to you as well, I would only recommend using one at a time as if you have an allergic reaction, the itches or any other discomfort...it would be hard to pinpoint where its coming from. For example, you could do:
1/2 cup coconut oil
1/2 cup olive oil
1 teaspoon Bhringraj
Infuse then strain. After straining, then add your 10 drops of lavender. Use the mixture on your scalp at night as Bhringraj has a very relaxing effect so it tends to make you a bit sleepy. I would say test it out for 2 weeks before you try another blend. You can continue repeating that process with each powder.
Yes, you can definitely mix powders and herbs in the same batch. I do it all the time, but straining it takes a bit more work but not by much.
I'll PM you and
@BeautifulRoots before the week is over about powders. Those jokers are potent and I now understand why they are sold in such small amounts. You really dont need much for them to be effective.