Can oral supplementation benefit the gut-skin axis?

What the latest research tells us

In late 2025, researchers from King’s College London published a comprehensive scoping review of 516 studies examining the relationship between oral probiotics, prebiotics and synbiotics and skin health. The review, published in Nutrition Reviews, mapped evidence across everything from general skin condition to the management of inflammatory skin conditions and skin ageing.

The findings were clear on two fronts. First, there is encouraging evidence that oral supplementation can meaningfully influence skin health. Second, there are still major gaps in the research, particularly beyond atopic dermatitis, and the field needs stronger, more standardised trials.

The gut-skin axis is now widely discussed across major global dermatology congresses and scientific sessions, with researchers presenting it as a key mechanism in inflammatory skin conditions and identifying probiotics as part of the new frontier in personalised treatment. These conversations continue to accelerate, with microbiome and skin health remaining a topic of discussion at major congresses throughout 2026.

Why this matters for how we think about skin

For decades, the skincare industry has focused almost exclusively on what you put on your skin. And topical treatments absolutely have their place. But here is the reality: the skin’s barrier function is designed to keep things out. Only molecules under 500 Daltons with very specific properties can penetrate beyond the surface layers. Most cosmetic actives work at surface level. That is not a failure of the product. It is simply how our skin works.

So when we see conditions like persistent breakouts, redness, or reactive skin that do not respond to topical treatments alone, we need to ask: what is happening beneath the surface?

This is where the gut-skin axis becomes important. When gut dysbiosis occurs, whether through diet, stress, medication or lifestyle factors, it creates a cascade. Intestinal permeability increases. Inflammatory mediators enter systemic circulation. And the skin, as a barrier organ that shares immune pathways with the gut, responds accordingly. You see it as breakouts. As redness. As skin that never quite calms down no matter what you apply.

The next step change: inside and out

The research increasingly supports what I have believed since founding Complete by Dr SCS: that the most effective approach to skin health works on two levels simultaneously.

Topically, you address what is happening at the skin’s surface. Targeted actives like azelaic acid, salicylic acid and niacinamide can clarify pores, reduce redness and support the skin barrier directly.

Internally, you address the root cause. A targeted probiotic blend, combined with nutrients like zinc, vitamin C and vitamin D, works to rebalance the microbiome, reduce systemic inflammation and support the immune pathways that connect gut health to skin clarity.

This is the thinking behind our Clarify System. It pairs a clinical-grade topical serum with a 6-strain probiotic capsule and targeted anti-inflammatory nutrients, designed to work on the gut-skin axis from the inside while treating the skin’s surface from the outside.

It is not about replacing your skincare routine. It is about completing it.

Where the science is heading

The King’s College review called for more human trials investigating the benefits of oral supplementation for conditions beyond atopic dermatitis, including skin health in the general population. The growing body of published research reinforces that understanding the gut-skin axis is becoming essential knowledge for clinicians, not a niche research area.

I find this shift encouraging. The evidence base is growing. The conversation is maturing. And the opportunity to help people achieve healthier skin by addressing root causes rather than symptoms alone has never been more compelling.

The future of skin health is not just topical. It is integrated. Inside and out.

Dr Sonal Chavda-Sitaram (MRPharmS, PhD) is the founder of Complete by Dr SCS, a science-led skincare and nutraceutical brand.

References

1. Hillier RA, Gibson R, Maruthappu T, Whelan K, Prpa EJ, Neill HR, Phillips CG, Hall WL. Probiotics, prebiotics, and synbiotics as oral supplements for skin health, function, and disease throughout the life course: a scoping review. Nutrition Reviews. 2025. doi:10.1093/nutrit/nuaf205

2. Jimenez-Sanchez M, Celiberto LS, Yang H, Sham HP, Vallance BA. The gut-skin axis: a bi-directional, microbiota-driven relationship with therapeutic potential. Gut Microbes. 2025;17(1):2473524. doi:10.1080/19490976.2025.2473524

3. Zhao Y, Yu C, Zhang J, Yao Q, Zhu X, Zhou X. The gut-skin axis: emerging insights in understanding and treating skin diseases through gut microbiome modulation (Review). International Journal of Molecular Medicine. 2025;56(6):210. doi:10.3892/ijmm.2025.5651

4. Singla N, Singla K, Attauabi M, Aggarwal D. Gut-skin axis: emerging insights for gastroenterologists – a narrative review. World Journal of Gastrointestinal Pathophysiology. 2025;16(3):108952. doi:10.4291/wjgp.v16.i3.108952