Home Skincare Glossary Vitamin A Vitamin A is essential for skin health, regulating cell turnover, promoting collagen production, and maintaining overall skin integrity. It’s found in various forms in skincare products, such as retinol, retinaldehyde, and retinoic acid. Retinol vs Tretinoin: Which One is Best For Your Skin Retinol vs. Retinal vs. Bakuchiol