Slugging: Is Coating Your Face in Vaseline Actually Smart?

Slugging is the practice of applying a thin layer of petroleum jelly (Vaseline, Aquaphor, CeraVe Healing Ointment) as the last step of your nighttime routine. The idea is to seal in all your other products and prevent transepidermal water loss while you sleep. It's been a K-beauty staple for years and went mainstream on Reddit's SkincareAddiction.

What the research says

Petroleum jelly is one of the most effective occlusive agents we have. It reduces transepidermal water loss by up to 98%. Dermatologists have recommended it for decades for wound healing, eczema management, and severely dry skin. It's non-comedogenic in its pure form — despite what it feels like, it doesn't typically clog pores in most people.

So the core science is sound. Occlusion works. Petroleum jelly is effective at it.

Where it makes sense

If your skin is dry, compromised, or recovering from a procedure, slugging can be genuinely helpful. Vata-type skin — thin, dry, easily irritated — often responds well to occlusion in the cold months. If you're in Milwaukee in January with the furnace running and your skin barrier is wrecked, a night of slugging over a good serum can make a real difference.

Where it falls apart

If your skin is oily, acne-prone, or congested — Kapha-type tendencies — slugging is a bad idea. Sealing in excess oil and trapping bacteria under a layer of petroleum jelly is a recipe for breakouts. I've seen it happen plenty of times.

Also, slugging doesn't add moisture. It only locks in what's already there. If you slug over dry skin without any hydrating layers underneath, you're just sealing in dryness. The occlusive layer needs something good underneath it to be worth anything.

My take

Slugging is a legitimate technique with a specific use case. It's not for everyone, and it's definitely not an every-night thing for most people. If your skin runs dry and you layer a hydrating serum or moisturizer underneath, it can work really well. If your skin is oily or breakout-prone, skip it entirely.

The trend oversells it as a universal hack. It's a tool — a seasonal, situational one. Use it when it makes sense. Leave it alone when it doesn't. That's the whole point.