Tallow is considered a good moisturizer due to its rich fatty acid profile, similar to that of human skin. These fats help to nourish and hydrate the skin, creating a protective barrier against moisture loss.

Potential disadvantages of tallow include its comedogenic potential for some skin types, meaning it may clog pores and cause breakouts. Also, individuals with beef allergies should avoid tallow-based products.

Dermatologists' opinions on beef tallow vary. While some acknowledge its moisturizing properties, others may recommend alternative moisturizers with more predictable formulations and fewer potential allergens or pore-clogging ingredients.

Tallow's decline in popularity is largely due to the rise of commercially produced, plant-based oils and synthetic ingredients that are often more readily available and easier to formulate with. Marketing trends also shifted towards these alternatives.