What exactly is a serum? The term serum is a medical term referring to the clear liquid in blood after both the cells and clotting factors are removed.
Shampoo is quite a recent invention with the first synthetic shampoo, Drene, being introduced in the United States in the 1930s.
The dry winter days are here. There are beautiful snowflakes. And with them come lots of skin flakes as well. Your skin is dry, scaly and may even show signs of cracking.
After 30 years of practicing dermatology, reading the medical literature and testing skincare product formulations it is clear to me that:
Koala bears aren't really bears. Jellyfish aren't really fish. And moisturizers don't really add water to the skin. And it's a good thing the skin doesn't absorb water or we'd swell up like a sponge when we swam in the ocean. And we don't.