Initially back in 2019 when I learned about cilantro helping as a heavy metal detox to put GD in remission, I included it in my delicious morning smoothie which I make with pro-biotic plain unsweetened yogurt, almond milk, raw egg, bovine collagen powder and frozen blueberries and banana. The cilantro flavor overpowered the other great flavors.
I thought I could get used to the taste of cilantro, never happened.
Today every few months for a few days or if I feel like GD may be recurring, I simply put 1/2 bunch fresh or frozen, stems and leaves, in a blender with enough water to liquify, about 1/2-3/4 cup. I then chug it down like a tonic. I put the cilantro in the blender I previously made my yummy morning smoothie in that way I only have to wash the blender once.

Shampoo- I've been able to use VMV Shampoo (recommended to me because it lacked my allergens). VMV makes 2 shampoos I can tolerate- their best cleaning shampoo which does contain SLS which are some are allergic to, but not me, is my favorite. Their Clark Wash Shampoo and Body Wash is the most gentle and good shampoo and a good one to start with if you don't know your allergens. However, it doesn't clean quite as well. Both benefit from soft water. I love their conditioner because it leaves my hair shiny and tangle free. VMV products are very expensive. The large size Super Wash now costs $37, it's gone up in price tremendously, but it's worth it to me.
To begin with, before I discovered VMV I simply used Grandma's Lye Soap. A soap bar made the old-fashioned way with lye and lard. Lye is converted into glycerin in the soap making process, so all that contacts your skin is lard and glycerin. It gets clean but leaves hair heavy even with soft water. I used this for a month and my scalp itch began to subside. My scalp was so inflamed it took many months to calm. I used to pull on my hair all the time, pulling hard blocked the madding itch. My husband kept telling me to stop or I would go bald pulling out my hair.