Slugging: Does This Skincare Trend Actually Work?

Slugging, applying a thick, occlusive layer (traditionally petroleum jelly) as the final step of a nighttime routine, went viral partly because of how visually unusual it looks and partly because people reported genuinely noticeable results the next morning. Separating the viral appeal from the actual mechanism helps decide whether it's worth trying for your specific skin.

This covers what slugging actually does, who benefits most, and how to do it without the common mistakes that lead to breakouts.

What slugging actually does

An occlusive layer applied as the final step traps the moisture and active ingredients from earlier routine steps against the skin overnight, preventing the water loss that normally happens through the skin's surface (called transepidermal water loss) while you sleep. This isn't adding new hydration itself, it's sealing in and maximizing what your routine already applied underneath.

Why it works particularly well overnight

Skin's natural water loss is highest overnight without an occlusive barrier, since there's no makeup, sunscreen, or other products creating any seal, making this the window where slugging's moisture-trapping effect has the most opportunity to make a genuine difference. This is part of why the technique is specifically a nighttime practice rather than something typically done during the day.

Who genuinely benefits from slugging

Very dry or dehydrated skin, and skin recovering from barrier damage caused by over-exfoliation or harsh products, sees the most noticeable benefit from slugging's intensive moisture-sealing effect. It's less necessary, and can be counterproductive, for naturally oily or acne-prone skin, where trapping additional oil and product against the skin overnight can contribute to breakouts.

Why slugging can cause breakouts for some people

Sealing an occlusive layer over skin that's still oily, or over active ingredients not suited to being trapped against skin for hours, can contribute to clogged pores and breakouts, particularly for oily or acne-prone skin types. This is the most common reason people try slugging, based on trend enthusiasm, and end up with worse skin rather than the promised glow.

How to do slugging correctly

Apply your full regular routine first, cleanser, treatment serums, moisturizer, and only then apply a thin layer of an appropriate occlusive product as the final sealing step, avoiding a thick, heavy application that isn't actually necessary for the technique to work. Skip slugging on nights you've used strong actives like retinol or exfoliating acids, since trapping these against skin overnight can intensify irritation beyond what's intended.

Choosing an appropriate occlusive product

Petroleum jelly is the traditional slugging product, though some people prefer alternatives with a slightly lighter feel while still providing meaningful occlusive benefit. Whatever product is used, it should be genuinely non-comedogenic and free from added fragrance or active ingredients that aren't meant to sit on skin for hours undisturbed.

Who should skip slugging

Oily and acne-prone skin generally does better without this technique, or with it used very selectively during particularly dry periods rather than as a regular practice, given the breakout risk from trapping oil and product against the skin overnight. If you try it and notice increased congestion or breakouts, that's a clear signal this particular technique doesn't suit your skin type.

The bottom line

Slugging's viral popularity is backed by a genuine, explainable mechanism, sealing in moisture and preventing overnight water loss, making it particularly valuable for very dry or barrier-compromised skin. It's not universally beneficial, though, and oily or acne-prone skin should approach it cautiously or skip it given the real breakout risk. Whether this technique fits your routine depends heavily on your underlying skin type more than the trend's popularity. Our dry skin collection has richer, supportive formulas if very dry skin is what's drawing you toward trying this technique.

FAQ

Does slugging actually hydrate skin, or just trap what's already there?

It doesn't add new hydration itself, it seals in and maximizes the moisture and active ingredients from the rest of your routine, preventing water loss that would otherwise happen overnight.

Can slugging cause acne?

Yes, particularly for oily or acne-prone skin, since trapping oil and product against the skin overnight can contribute to clogged pores and breakouts.

What products are used for slugging?

Petroleum jelly is the traditional choice, though other occlusive products can work as long as they're genuinely non-comedogenic and free from unnecessary added ingredients.

Should I use retinol or acids before slugging?

It's generally better to skip slugging on nights you've used strong actives like retinol or exfoliating acids, since trapping them against skin overnight can intensify irritation beyond what's intended.

Is slugging necessary for normal or combination skin?

Not necessarily, it offers the most meaningful benefit for very dry or barrier-compromised skin specifically, and normal or combination skin may not see proportional benefit from the technique.