Body Lotion & Butter

One ladder runs through this whole shelf, and it is the ratio of water to oil. Lotion is mostly water, sinks in fast and is gone in a few hours. Cream carries more oil, sits heavier and lasts longer. Body butter is largely butters and waxes with very little water, so it coats more than it absorbs. None of the three is better than the others; they are three different lengths of protection.

Three ingredient jobs do the work, and a good product uses all three. Humectants such as glycerin and urea pull water toward the skin. Emollients such as squalane and plant oils fill the gaps between surface cells so skin feels smooth. Occlusives such as petrolatum, shea butter and dimethicone form a physical barrier that slows evaporation. A humectant alone in dry winter air pulls water out of the skin instead of into it. So the occlusive layer stops being optional in cold weather.

Hand cream runs the same idea built to survive washing, so it packs more occlusive and absorbs faster. Body oil supplies emollient and occlusive with no water whatsoever, which is why it works best pressed onto still wet skin. Scrubs remove and this replaces. A bath oil coats you as you climb out of the tub and gives you no say in where it lands. Lotion lets you choose the dose and the target.

Butter belongs on elbows, knees, heels, shins and anywhere that cracks in winter. Lotion suits summer, hairy skin, and mornings when you have to dress immediately. Anyone with body acne across the back or chest should keep butters off those areas, since heavy occlusives trap sweat under a shirt. Fragrance free versions are the sensible default for eczema, and formulas with alcohol high in the ingredient list sting broken skin.

Timing beats formula. Applying within about three minutes of stepping out, on skin still slightly damp, traps that surface water and roughly doubles what the same product achieves on dry skin. Next morning is the fair moment to assess a lotion, since anything feels pleasant on contact. Pump bottles stay cleaner than tubs. Radiators and hot cars split emulsions, and a lotion that has separated never mixes back properly.