What Are the Best Supplements for Skin Hydration and Dry Skin?

Dry skin is not simply a matter of drinking more water. How hydrated skin looks and feels depends in part on the skin barrier — particularly the outermost layer of the skin — and its ability to retain water.

What Actually Determines Skin Hydration?

The skin barrier helps prevent excessive water from escaping from the skin. One measure researchers use to assess this is transepidermal water loss (TEWL) — the amount of water that passively evaporates through the skin.

That distinction matters. A supplement may support skin hydration not by adding water directly to the skin, but by supporting the skin's ability to retain it.

Which Supplements Have the Best Evidence for Skin Hydration?

1. Oral Ceramides: Hydration + Water Retention

Ceramides are lipids naturally present in the outer skin barrier and play an important role in limiting water loss.

A systematic review and meta-analysis of randomized controlled trials found that oral ceramide supplementation significantly increased skin hydration and reduced TEWL compared with placebo.¹

More recently, a randomized, double-blind, placebo-controlled study evaluated Ceramosides™, a specific wheat polar lipid complex, in women with dry and wrinkled skin. The powder form was given at 30 mg per day. Supplementation improved hydration and reduced TEWL, while also improving elasticity, smoothness, roughness and wrinkle depth. Improvements were observed after 14 days of supplementation.²

For dry skin, this makes oral ceramides one of the most directly relevant supplement categories.

2. Collagen Peptides: Evidence for Hydration, With Caveats

Collagen supplements are usually associated with skin structure and elasticity, but hydration has also been extensively studied.

Multiple meta-analyses of randomized trials have reported improvements in skin hydration with oral collagen supplementation.^{3, 4} However, the literature is heterogeneous, and a 2025 meta-analysis found that apparent benefits were not significant when analyses were restricted to higher-quality or non-industry-funded studies.⁵

The fairest conclusion is that collagen has substantial human research suggesting a hydration benefit, but the magnitude and certainty of that effect remain debated.

3. Oral Hyaluronic Acid + Procyanidins

Oral hyaluronic acid and procyanidins have also been studied for skin hydration. In the 2022 systematic review, both produced statistically significant improvements in skin hydration compared with placebo. However, there were not enough randomized trials to determine their effects on TEWL with the same confidence as collagen and ceramides.¹

What About Astaxanthin?

Astaxanthin is frequently included in skin supplements, but the hydration evidence deserves qualification. One meta-analysis found that oral astaxanthin significantly improved skin moisture and elasticity versus placebo.⁶ However, a separate systematic review focused specifically on skin moisturization judged the evidence for astaxanthin insufficient because relatively few randomized trials were available.¹

It is therefore better viewed as a broader antioxidant skin-support ingredient than as the primary supplement for dry skin.

Why Barrier Support Matters as Much as Hydration

Hydration and barrier function are closely connected. Skin can contain water yet lose it more readily when barrier function is impaired.

That is why research measuring both skin hydration and TEWL is particularly useful. Oral ceramides stand out because randomized-trial evidence supports both outcomes.^{1, 2}

Where ATIKA Advanced Skin Nutrition Fits

For people looking for a skin supplement that goes beyond hydration alone, ATIKA Advanced Skin Nutrition combines ingredients designed to support several aspects of skin biology in one daily formula.

Each serving provides 30 mg Ceramosides™ — the same daily amount of the powder form evaluated in the 2024 clinical study — alongside 2.5 g VERISOL® collagen peptides and a broader system of carotenoids, polyphenols, antioxidants, vitamins and other skin-supportive nutrients.

The finished ATIKA formula itself has not yet been clinically tested specifically for skin hydration or dry skin. Evidence from individual ingredients should not be interpreted as evidence that the finished formula produces the same outcomes observed in individual ingredient studies.

Frequently Asked Questions

What are the best supplements for skin hydration?

Oral ceramides and collagen have the largest bodies of randomized-trial evidence among commonly studied skin-hydration supplements. Oral hyaluronic acid and procyanidins have also shown hydration benefits, although fewer studies have evaluated their effects on transepidermal water loss.¹

What vitamins are good for dry skin?

Vitamins are essential for normal skin function, but vitamin supplementation is not necessarily the same as treating dry skin. Correcting a nutritional deficiency can matter, but evidence for oral skin hydration is more direct for ingredients such as ceramides and collagen than for simply taking high doses of individual vitamins.

Do ceramide supplements actually work?

There is randomized controlled evidence that specific oral ceramide-containing preparations can improve hydration and reduce water loss through the skin. However, products and doses differ, so results from a particular clinically studied ingredient should not automatically be generalized to every product marketed as an oral ceramide.^{1, 2}

Does collagen hydrate skin?

Multiple randomized trials and meta-analyses report improved skin hydration with oral collagen, but the evidence is not completely settled. Results vary across studies, and analyses based on study quality and funding source have raised questions about the strength of the effect.^3–5

Does drinking more water fix dry skin?

Not necessarily. Skin hydration depends partly on the skin barrier's ability to retain water, not simply how much water a person drinks. Adequate overall hydration is important, but persistent dry skin can still occur when barrier function is impaired.

How long do skin hydration supplements take to work?

It depends on the ingredient and study. In the 2024 Ceramosides™ trial, improvements were detected after 14 days of supplementation. Collagen trials typically evaluate outcomes over several weeks or months. Clinical-study timelines should not be interpreted as a guarantee that every person will experience the same result.²

The Bottom Line

For skin hydration, oral ceramides have particularly direct evidence because studies measure both increased hydration and reduced water loss. Collagen also has a substantial—though more debated—body of evidence for hydration. The broader lesson is that supporting dry skin is not simply about adding water: helping the skin retain water matters too.

Related Reading

• Oral Ceramides for Skin Hydration: What the Evidence Shows
• What Are the Best Supplements for Skin Elasticity?
• Collagen & Skin Structure: An Evidence-Based Guide

References

1. Sun Q, Wu J, Qian G, Cheng H. Effectiveness of dietary supplement for skin moisturizing in healthy adults: A systematic review and meta-analysis of randomized controlled trials. Front Nutr. 2022;9:895192. doi:10.3389/fnut.2022.895192.
2. Kern C, Dudonné S, Garcia C. Dietary supplementation with a wheat polar lipid complex improves skin conditions in women with dry skin and mild-to-moderate skin aging. J Cosmet Dermatol. 2024;23(4):1320–1330. doi:10.1111/jocd.16130.
3. Pu SY, Huang YL, Pu CM, et al. Effects of oral collagen for skin anti-aging: A systematic review and meta-analysis. Nutrients. 2023;15(9):2080. doi:10.3390/nu15092080.
4. Danessa G, Notario D, Regina R. Effects of collagen-based supplements on skin's hydration and elasticity: A systematic review and meta-analysis. Indian J Dermatol Venereol Leprol. 2025;91(6):730–740. doi:10.25259/IJDVL_1165_2023.
5. Myung SK, et al. Effects of collagen supplements on skin aging: A systematic review and meta-analysis of randomized controlled trials. Am J Med. 2025;138(9):1264–1277. doi:10.1016/j.amjmed.2025.04.034.
6. Zhou X, Cao Q, Orfila C, Zhao J, Zhang L. Systematic review and meta-analysis on the effects of astaxanthin on human skin ageing. Nutrients. 2021;13(9):2917. doi:10.3390/nu13092917.