For hair, I use Olaplex. It's to repair hair damaged by dying, but I figured from the description, if it works, it'll work on any hair.
Success! I left it in for about five hours, washed it out, shampooed, used a conditioner, leave in conditioner, and argan oil. I do this every week, and my husband (who NEVER notices these things) said my hair did feel a lot softer (after I forced him to pet me). I used Marrakesh argan oil products, Briogio(sp) leave in conditioner, Kirkland shampoo, and Tsubaki Extra Moist Conditioner / hair masque. Note: I've always had pretty nice hair, but Olaplex definitely boosted me in that my hair will still be shiny and feel soft if I do nothing but shampoo (it used to not be that nice unless I used ALL my products).
TBH I love my hair. It's super soft, and after Olaplex I've been shedding less. I've always had a lot of hair so it's whatever, but it's easier to clean my drain haha.
For my skin I've noticed a HUGE improvement in acne (I still get it but it goes away in a day or two and never comes to head or gets really red), and a small improvement in skin health (it just LOOKS nicer). My routine is kinda weird though. Also, I have combo skin - dry cheeks, oily t zone, though with extra thick cream on my cheeks and chin I noticed they've been a lot less dry.
I alternate between:
Morning: quick wash w/Shiseido (no Clarisonic), Beauty Water (Son & Park), salicylic acid pad (neutrogena), lotion (Grown Alchemist), and sunscreen (Shiseido).
Morning: quick wash/Shiseido (no Clarisonic), exfoilate (ORG), Beauty Water (Son & Park), serum (La Mer), creme lotion (La Prairie), and sunscreen (Shiseido)
Evening: wash w/Clarisonic (Shiseido), Beauty Water (Son & Park), retinol (First Aid Beauty), lotion (Grown Alchemist), sleeping mask (Laniege)
Evening: wash w/Clarisonic (Shiseido), Beauty Water (Son & Park), salicylic acid pad (neutrogena), pre-serum [essence?] (Missha, new, so not a factor), lotion
TBH I got like five or six new products and started using them all at once so I don't know which ones really work. I got retinol a month ago, have had my Clarisonic forever, Beauty Water a week ago, all the La Mer/La Prairie (samplers) a week ago, sleeping mask two months ago, Grown Alchemist two weeks ago, and Missha last night.
I used to wear BB cream but I've basically stopped wearing all makeup, even anything tinted, on my skin. Only eyeliner, a single eyeshadow, and eyebrow pencil. For special occasions I'll put on primer and bb cream.