Has anyone ever used essential oils with their shampoo?

i have Aura Cacia's 100% Essential Oil in Wild Chamomile.. it says you can add a few drops to your conditioner or something... has anyone ever done this? what does it do for your hair? i tried finding it online but no luck.Has anyone ever used essential oils with their shampoo?
i have never tried it but i read that you can do it. No harm done to your hair. just a pretty scent.Has anyone ever used essential oils with their shampoo?
I've never tried putting it into my conditioner, but sometimes I'll put some essential oil like lavender on my fingers and rub it into my scalp and a bit into my hair. Lavender helps make it less oily if it's too oily, or moisturizes it if it's dry.