Vitamin A palmitate, also called retinyl palmitate, is present in most animal products. It is a retinoid (retinol) and retinoids are the bioavailable substances, because they have high absorption rate and work efficiently.
Vitamin A divides into two specific groups: retinoids and carotenoids.
Carotenoids are the pigments that give plants and fruit their bright colors. Unlike retinoids, carotenoids are not very bioavailable, because their conversion rate into retinoids is very minimal.