Forms alone won't accomplish anything if the dose isn't correct. With regard to vitamin A, some people confuse it with beta carotene, with the latter not working so well for this effect. Vitamin A even has evidence backing it as per PMC6462169. It does take a few weeks to begin to work. Even mild improvements stack up. It may not eliminate the need for an additional intervention, but it can mean the difference between whether the additional intervention will work or fail.