Panthenol is supposed to add moisture and act as a humectant without building up on the hair shaft. If someone has problems with a product like Pantene, I would suspect that 'cones were the problem, rather than the tiny amount of panthenol they put in the bottle.

I like to add a small amount of dl-panthenol to my conditioner, to make it more moisturizing.
Type 2b. Wash: WEN pomegranate or fig. Leave-in conditioner: Alaffia beautiful curls for wavy hair, Spiral Solutions Protein spray. Style: Curls In A Bottle, Ecostyler, or KCCC.