Tallow and lard are both rendered animal fats with a long history of use in skincare, but they each bring something a little different to the table. Tallow, rendered from beef fat, is exceptionally dense in fat-soluble vitamins - A, D, E, K, and B12 - and is known for its deeply moisturizing and healing properties. It's a heavier, more occlusive ingredient, which makes it particularly effective for dry or compromised skin, eczema, psoriasis, and overnight repair. 

Lard, rendered from pork fat, is lighter in consistency and has a pH that sits closer to that of human skin, making it especially gentle and well-absorbed. It's high in vitamin D, omega-3 fatty acids, and vitamin A, and is often preferred by those with sensitive or acne-prone skin who want the benefits of animal-based skincare without as much weight.