Oral collagen as an active ingredient is the number one selling product to improve skin health, which is available in the form of a drinkable powder, capsule, or tablet, with dosages ranging from 1 gram to over 10 g per day, which is typically well tolerated, as reported by numerous studies [29]
10.2147/OPTH.S49927 Gosak M, Goji D, Spasovska E, Hawlina M, Andjelic S: Cataract Progression Associated with Modifications in Calcium Signaling in Human Lens Epithelia as Studied by Mechanical Stimulation
it helps cells respond more appropriately to signals that are already present
Safety depends heavily on product quality and administration in a sterile medical environment
On top of oral supplementation, prescription medications are also available