The Trend Everyone Is Talking About
If you've spent more than five minutes on skincare TikTok lately, you've seen it: people slathering a thick, shiny layer of Vaseline or Aquaphor all over their face before bed and waking up with what they're calling "glass skin." This is slugging — and it's one of the most searched skincare terms of 2026.
The name comes from the shiny, slug-like appearance of your face after application. It sounds strange. It looks stranger. But before you dismiss it, let's look at what the science actually says — because this one is more nuanced than most viral trends.
What Is Slugging, Exactly?
Slugging is the practice of applying a thick occlusive moisturizer — typically petroleum jelly (Vaseline), Aquaphor, or a similar balm — as the final step of your nighttime skincare routine. The goal is to create a physical seal over your skin that locks in all the moisture and active ingredients you've already applied.
An occlusive doesn't add moisture to your skin — it traps the moisture already there. Think of it as a plastic wrap for your face: nothing gets in, nothing gets out.
The Science Behind Slugging
Evidence Tier: TIER 1 — Multiple peer-reviewed studies confirm the mechanism.
Occlusives are one of the most well-studied categories in dermatology. Petroleum jelly in particular has decades of clinical research behind it. Here's what we know:
- Transepidermal water loss (TEWL) reduction: Occlusives significantly reduce TEWL — the rate at which water evaporates from your skin. Multiple studies confirm this is one of the most effective ways to maintain skin hydration overnight.
- Skin barrier repair: Research published in the Journal of Investigative Dermatology shows that occlusives support the skin's natural barrier repair process by creating a protected environment for lipid synthesis.
- Wound healing support: Petroleum jelly has been used in clinical wound care for decades. It keeps the skin moist, which accelerates healing and reduces scarring.
The mechanism is solid. The question is whether slugging is right for your skin type.
Who Should Slug — And Who Should Skip It
Slugging works best for:
- Dry, dehydrated, or compromised skin barriers
- People dealing with eczema, psoriasis, or chronic dryness
- Anyone using retinol or exfoliants who experiences dryness or sensitivity
- Cold-weather skin that loses moisture rapidly overnight
Slugging may not work for:
- Acne-prone or oily skin — occlusives can trap sebum and bacteria, potentially worsening breakouts
- People with fungal acne (malassezia) — petroleum jelly can feed the fungus
- Anyone with very congested pores
Note: If you have a diagnosed skin condition like eczema, rosacea, or acne, consult a qualified dermatologist before adding slugging to your routine.
The Tallow Alternative: Why Some Skincare Enthusiasts Are Ditching Vaseline
Here's where it gets interesting. A growing segment of the skincare community — particularly those in the ancestral health and clean beauty spaces — is replacing petroleum jelly with grass-fed beef tallow as their slugging occlusive of choice.
The argument: tallow's fatty acid profile (oleic, palmitic, stearic, and linoleic acids) closely mirrors human sebum, making it more biocompatible than petroleum-derived products. Early mechanistic research supports this — tallow contains fat-soluble vitamins A, D, E, and K that petroleum jelly lacks entirely.
Evidence Tier: TIER 3 — The evidence is limited to mechanistic studies and anecdotal reports. There are no head-to-head RCTs comparing tallow to petroleum jelly for slugging outcomes. But the anecdotal reports are compelling, and the ingredient science is sound.
Our Tallow Body Balm is a premium grass-fed tallow formulation that many Veracil customers use as their slugging occlusive — it's rich, deeply nourishing, and free from petroleum derivatives. For a deeper dive into tallow's skin benefits, read our Complete Guide to Grass-Fed Tallow for Skin and our Power of Tallow article.
How to Slug Correctly: The Step-by-Step Protocol
- Cleanse thoroughly. Slugging over a dirty face traps bacteria and debris. Double cleanse if you wore makeup or sunscreen.
- Apply your water-based serums first. Hyaluronic acid, niacinamide, peptides — apply these while your skin is still slightly damp. Our Full Infusion Hyaluronic Serum is ideal here, delivering deep hydration before you seal it in. The Hyaluronic Plumping Serum with Vitamin B5 & Snow Mushroom is another excellent option for an extra hydration boost.
- Apply your actives (if using). Retinol, AHAs, or prescription treatments go on before the occlusive. Note: slugging over retinol significantly increases penetration — start with a lower concentration if you're new to this combination.
- Apply your moisturizer. A lightweight moisturizer goes on before the occlusive layer.
- Seal with your occlusive. A thin layer is enough — you don't need to cake it on. Apply to your face, neck, and any dry patches.
- Sleep on a clean pillowcase. Silk or satin is ideal — it won't absorb your products and is gentler on skin.
Slugging + Active Ingredients: What You Need to Know
One of the most important things to understand about slugging is that it increases the penetration of everything underneath it. This is a double-edged sword:
- Good: Your hyaluronic acid, peptides, and niacinamide will work harder.
- Caution: Your retinol, AHAs, and prescription actives will also penetrate more deeply — which can cause irritation if you're not careful. Start slow.
For more on layering actives correctly, see our guide on Retinol and Vitamin C layering and our Skin Cycling guide — slugging pairs beautifully with a skin cycling protocol.
The Verdict: Confirm or Bust?
✅ PRELIMINARY CONFIRM — with caveats.
The occlusive mechanism behind slugging is scientifically sound and well-supported. For dry, dehydrated, or barrier-compromised skin, slugging is a legitimate and effective strategy. The debate is really about which occlusive to use and whether it's appropriate for your skin type. If you're acne-prone, proceed with caution. If you're dry or dealing with a damaged barrier, this might be the overnight reset your skin has been waiting for.
Shop This
Disclosure: Veracil sells several of the products mentioned in this article. All product recommendations are based on ingredient science and formulation quality.
- Tallow Body Balm — A premium grass-fed tallow occlusive that mirrors your skin's natural sebum. Use as your slugging seal for deeply nourishing overnight repair.
- Full Infusion Hyaluronic Serum — Apply before slugging to lock in deep hydration. Multi-weight hyaluronic acid that works at every layer of the skin.
- Hyaluronic Plumping Serum with Vitamin B5 & Snow Mushroom — An advanced hydration serum to layer under your occlusive for maximum overnight plumping.
- Medicube PDRN Pink Peptide Serum — Layer this peptide-rich serum before slugging to amplify its regenerative effects overnight.
0 comments