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The best hydrating ingredients for skin fall into 3 functional categories: humectants, which attract water into the skin; occlusives, which form a barrier to prevent water loss; and emollients, which smooth and soften the skin’s surface. According to StatPearls, published through the National Center for Biotechnology Information (NCBI), moisturizers work by hydrating and restoring the skin’s natural barrier function through a combination of these 3 ingredient types working together.
This guide covers how skin hydration works, which ingredients deliver the strongest clinical outcomes, and how to identify them in product formulas.
Skin hydration refers to the water content held within the stratum corneum, which is the outermost layer of the epidermis. According to the NCBI StatPearls review on moisturizers (2024), the stratum corneum is organized in a “bricks and mortar” structure composed of corneocytes surrounded by lipid lamellae made of ceramides, cholesterol, and free fatty acids. When this structure is intact, water is retained inside the skin. When it is compromised, transepidermal water loss (TEWL) increases, causing skin to feel tight, rough, and dull.
Hydration is distinct from oiliness. Skin can be both oily and dehydrated at the same time because oil (sebum) and water content are regulated by separate biological systems.
The following table identifies the 6 best hydrating ingredients for skin, organized by functional category, mechanism of action, and the skin types each ingredient is best suited for. Understanding these categories helps identify whether a formula is designed to attract water, lock it in, or restore the skin’s structural barrier.
The table below classifies each ingredient by type, so you can match the right hydrating strategy to your specific skin concern, whether that is dehydration, dryness, or compromised barrier function.
| Ingredient | Category | Mechanism | Best For |
| Hyaluronic Acid (Sodium Hyaluronate) | Humectant | Binds up to 1,000 times its weight in water (approximately 1 g / 0.035 oz of HA holds up to 1 liter / 33.8 fl oz of water) | All skin types; especially dehydrated and aging skin |
| Glycerin | Humectant | Attracts water from the environment and deeper skin layers into the stratum corneum | All skin types; especially dry and combination skin |
| Ceramides | Emollient + Barrier Repair | Replenishes lipids in the stratum corneum to reduce TEWL and prevent moisture evaporation | Dry, sensitive, compromised skin |
| Sodium PCA | Humectant | A naturally occurring component of the skin’s NMF (Natural Moisturizing Factor); binds water and prevents dehydration | All skin types; especially aging and environmentally stressed skin |
| Aloe Vera (Aloe Barbadensis) | Humectant + Anti-inflammatory | Hydrates, soothes, and helps relieve discomfort associated with dryness | Sensitive, dry, and irritated skin |
| Panthenol (Vitamin B5) | Humectant + Emollient | Binds water to the skin and reduces inflammation; improves hydration and softness | Sensitive skin, acne-prone skin, post-procedure skin |
Hyaluronic acid (HA) is a glycosaminoglycan molecule naturally present in the skin’s connective tissue and extracellular matrix. According to a review published in PMC (2023), HA is a hygroscopic molecule with the documented ability to bind up to 1,000 times its volume in water (1,000 ml / 33.8 fl oz per gram / 0.035 oz), making it one of the most efficient humectants in dermatology.
A 2021 randomized, double-blind, placebo-controlled study published in PubMed involving 40 healthy adults (aged 35 to 64 years) found that daily hyaluronic acid intake over 12 weeks significantly improved stratum corneum water content, skin elasticity, and transepidermal water loss compared to the placebo group. Topically, a 6-week clinical study published in PMC (2021) found that a hyaluronic acid serum produced a measurable increase in skin hydration within 15 minutes of first application, with results continuing to improve cumulatively through weeks 4 and 6.
HA formulas that combine multiple molecular weights (low, medium, and high) are known for delivering hydration at different depths of the skin simultaneously.
Yes, glycerin works as effectively as hyaluronic acid for surface hydration and is one of the most clinically validated humectants in skincare. According to a 2017 randomized, assessor-blinded study published in PMC, a formulation containing hyaluronic acid 1% (by weight) and glycerin 5% (by weight) significantly improved skin hydration and reduced transepidermal water loss (TEWL) at 24 hours post-application compared to a control site, with a statistically significant difference in TEWL at the P=0.049 level and hydration at P=0.001.
The American Academy of Dermatology notes that glycerin is a natural humectant that draws moisture into the skin, and that moisturizers containing glycerin help lock in moisture for more hydrated, comfortable-feeling skin in individuals with dry or cracked skin.
Glycerin is frequently paired with hyaluronic acid in formulations because the two ingredients work synergistically: glycerin draws water to the skin’s surface while HA retains it within the stratum corneum.
Yes, ceramides both hydrate the skin and repair the barrier, and these 2 functions are directly connected. According to research reviewed in PMC (published under the title “Skin hydration is significantly increased by a cream formulated to mimic the skin’s own natural moisturizing systems”), ceramides are the primary lipids found in the stratum corneum’s lamellar bilayer structure. Their role is to prevent transepidermal water loss by sealing the spaces between skin cells.
A pilot study comparing a ceramide-based moisturizer against 3 reference over-the-counter (OTC) products found that a single topical application of the ceramide cream produced significantly greater skin hydration at 24 hours post-application compared to all 3 reference formulas (P<0.05). This outcome demonstrates that ceramides do not just repair the barrier passively but actively increase measurable water retention in the skin.
Ceramides are most effective when paired with humectants such as glycerin or sodium hyaluronate, which first draw water into the skin before ceramides lock it in.
The best hydrating ingredients for skin are most effective when layered in the correct sequence within a routine. La Garan’s formulations use clinically recognized humectants and emollients across all product categories. All products are cruelty-free, paraben-free, vegan, and made in the USA.
Hydrating Serums La Garan’s Vegan Vitamin C Serum ($29.99, 50% off) contains Glycerin and Vitamin E in a lightweight, oil-free base. Apply 3 to 5 drops (0.1 ml to 0.15 ml) to cleansed skin before moisturizer for a hydrating base layer.
Hydrating Toner La Garan’s Vitamin C Toner ($29.99, 30% off) is formulated with Glycerin, Aloe Barbadensis Leaf Extract, Algae Extract, and Pullulan. These ingredients hydrate, firm, and condition the skin before serum and moisturizer application.
Lightweight Daily Moisturizer La Garan’s Vitamin C Face Lotion ($29.99, 30% off) contains Sodium Hyaluronate, Glycerin, Aloe Barbadensis Leaf Extract, Panthenol (Vitamin B5), and Allantoin. It delivers layered humectant hydration in a silky, non-greasy texture suitable for all skin types.
Peptide Moisturizer (AM) La Garan’s Peptide Lotion ($29.99, 57% off) features Sodium Hyaluronate Crosspolymer (cross-linked for longer-lasting hydration), Glycerin, Squalane, and Macadamia Seed Oil. It is formulated to prevent collagen and elastin breakdown while maintaining deep moisture levels throughout the day.
Intensive Night Cream La Garan’s Hydration x3 Cream ($69.99, 56% off) is designed specifically for dry skin. It combines Squalane, Sodium PCA, Sodium Hyaluronate, Aloe Barbadensis Leaf Juice Powder, and 5 nourishing plant oils (Avocado, Sunflower, Sesame, Hazelnut, and Jojoba) alongside HYDRAPATCH™ Technology, a patented blend of natural moisturizing factors. This makes it the most concentrated hydration product in La Garan’s natural face creams range.
Peptide Night Cream La Garan’s Peptide Face Cream ($64.99, 55% off) combines Squalane, Glycerin, Sodium Hyaluronate Crosspolymer, and Macadamia Seed Oil to prevent transepidermal water loss overnight while supporting firmness with Matrixyl® Synthe’6™ peptide.
Browse the full cruelty-free lotions collection or shop all products to find the right hydrating formula for your skin type.
The best hydrating ingredients for skin work because they address moisture at 3 levels: drawing water into the skin, locking it inside the stratum corneum, and repairing the lipid barrier that prevents water from escaping. Used consistently within a daily routine, these ingredients produce measurably softer, plumper, and more resilient skin within 4 to 8 weeks.
