Best vitamin a products

Topical tretinoin improves photoaged skin. A double-blind vehicle-controlled study

Improvement of naturally aged skin with vitamin A (retinol)

Topical tretinoin for treatment of photodamaged skin. A multicenter study

Two concentrations of topical tretinoin (retinoic acid) cause similar improvement of photoaging but different degrees of irritation. A double-blind, vehicle-controlled comparison of 0.1% and 0.025% tretinoin creams

Topical tretinoin (retinoic acid) treatment of hyperpigmented lesions associated with photoaging in Chinese and Japanese patients: a vehicle-controlled trial

Effect of Vitamin A Supplementation on fatigue and depression in Multiple Sclerosis patients: A Double-Blind Placebo-Controlled Clinical Trial

Vitamin A

The importance of vitamin A in nutrition

Vitamin A - StatPearls - NCBI Bookshelf

Vitamin A Deficiency

Role of Vitamin A in the Immune System

Vitamin A in human nutrition

Vitamin A - Health Professional Fact Sheet

The acute and chronic toxic effects of vitamin A

Vitamin A Deficiency - StatPearls - NCBI Bookshelf

Vitamin A | The Nutrition Source | Harvard T.H. Chan School of Public Health

Vitamin A deficiency

Studies of Vitamin A Deficiency in Children | The American Journal of Clinical Nutrition | Oxford Academic