First, What Is Slugging?
Don’t worry, no actual slugs are involved. Slugging is the practice of applying a thin layer of an occlusive product—typically petroleum jelly—as the final step in your nighttime skincare routine. The term comes from the slick, slimy look it gives your skin.
The goal isn't for the occlusive itself to moisturize, but to act as a barrier. It seals in all the hydrating products you applied beforehand (like serums and moisturizers) and, crucially, prevents transepidermal water loss (TEWL) overnight. Think of it as putting a cozy blanket over your skin to keep all the good stuff in and protect it from the dry air while you sleep.
Who Should (and Shouldn't) Slug?
Slugging is not a one-size-fits-all solution. It’s a dream for certain skin types and a potential nightmare for others. It works best for those with dry, dehydrated, or mature skin. If your skin often feels tight, flaky, or looks dull, slugging can help restore its plumpness and glow. It's also excellent for anyone with a compromised skin barrier from over-exfoliation, harsh weather, or a new retinol routine, as it helps the skin repair itself. However, if you have oily or acne-prone skin, proceed with extreme caution or avoid it altogether. While petroleum jelly itself is non-comedogenic (meaning it doesn’t clog pores), it can trap oil, dead skin cells, and bacteria against the skin, potentially leading to breakouts and milia (small white bumps).
The Right Products for the Job
The key to successful slugging is choosing the right occlusive. You’re looking for a simple, fragrance-free formula with minimal ingredients. The gold standard is 100% petrolatum, which you’ll find in classic products like Vaseline. Other fantastic and widely available options include Aquaphor Healing Ointment (which also contains lanolin and glycerin for extra soothing) and CeraVe Healing Ointment (which includes ceramides and hyaluronic acid). You don't need a fancy or expensive product. In this case, the most basic, old-school ointments from the drugstore are often the most effective. The product should feel thick and create a protective barrier; if it absorbs instantly like a lotion, it’s not an occlusive.
A Step-by-Step Slugging Guide
Doing it right is simple. First, start with a thoroughly cleansed face. Slugging on dirty skin is a recipe for disaster, as you’ll be trapping dirt and bacteria under the occlusive layer. Second, apply your normal nighttime hydrating routine. This typically includes a hydrating toner, essence, or serum (think hyaluronic acid or glycerin-based products) followed by a good moisturizer. Give these products a minute or two to absorb. Finally, take a pea-sized amount of your chosen occlusive, warm it up between your fingertips to make it more spreadable, and gently pat a thin, even layer all over your face. You don't need to be dripping in product; a light, glistening sheen is all it takes. Then, protect your pillowcase with a towel and go to bed.
Common Mistakes to Avoid
The biggest slugging mistake is applying it over the wrong ingredients. Never slug on nights when you’re using potent active ingredients like retinoids (retinol, tretinoin) or exfoliating acids (AHAs, BHAs). The occlusive layer can enhance the penetration of these ingredients, dramatically increasing your risk of irritation, redness, and peeling. Reserve slugging for “rest days” in your skincare cycle. Another common error is using too much product. A thick, gloopy layer isn’t more effective and will just make a mess. A pea-sized amount is plenty for the entire face. Lastly, don't feel pressured to slug every night. For many, once or twice a week, or as needed when your skin feels particularly dry, is the perfect frequency to reap the rewards without overwhelming your pores.
