I like to use the Fable & Mane SahaScalp Amla Soothing Serum ($34) the night before I wash my hair. I part my hair down the middle and use one dropper full from the crown of my head to the nape of my neck and massage it in. I do the same thing while parting my hair on each side using a dropper full of the serum. I concentrate the serum on my scalp and really massage it in, making sure my roots are getting all the nourishment. In total, I use around three to four dropper-fulls of the serum on my scalp for a deep conditioning treatment, and any excess, I bring down to the ends of my hair. I sleep with it in my hair overnight and wash it the next day.
Pro tip: if you have any dry spots on your scalp or want to give your scalp a boost of nourishment, use two to three drops of the serum and massage it into your scalp for instant hydration without weighing down the hair.