The Skin Diary is tackling one of skincare’s most damaging hidden culprit, the so-called “zombie cell”. These dysfunctional skin cells linger in the tissue long after they have stopped functioning, accelerating signs of ageing beneath the surface. With its science-led formulas, the dermatologist-founded brand is using its expertise to focus on protecting and repairing skin at a cellular level rather than developing surface-level treatments that ignore the underlying causes of skin decline.
Zombie cells, or senescent cells, are skin cells that have effectively stopped dividing and therefore repairing themselves – yet remain present in the tissue. Rather than supporting healthy regeneration, these cells release inflammatory molecules known as the Senescence-Associated Secretory Phenotype (SASP), which disrupt nearby healthy cells. This process slows cell turnover, increases inflammation, and contributes to the breakdown of collagen and elastin. Over time, the accumulation of these cells plays a role in visible skin ageing, including dullness, reduced firmness, and the appearance of fine lines.
Addressing these triggers is central to The Skin Diary’s Age Defence Moisturising Day Cream (£92). Described as the brand’s “Everything Day Cream”, the formula combines all-day hydration with DNA repair enzymes, antioxidants and encapsulated SPF50. UV exposure is one of the biggest drivers of DNA damage, a key factor in pushing cells toward senescence, and the cream’s broad-spectrum protection helps shield skin from this daily stress. Meanwhile, enzymes work to repair UV-induced DNA damage, while antioxidants help neutralise the free radicals that can further accelerate cellular ageing.
The Skin Diary itself was founded by Dr Clare Kiely, a London-based consultant dermatologist and laser surgeon specialising in skin ageing and skin cancer. Built on decades of clinical experience, the brand focuses on streamlined skincare powered by research-backed ingredients. Rather than chasing trends, the philosophy centres on dermatological science and formulas designed to support skin health at its foundation.
The brand centres itself around several carefully selected ingredients to support its approach. Bilberry extract helps protect against oxidative stress caused by environmental exposure, and Niacinamide (vitamin B3) works to strengthen the skin barrier while calming inflammation and improving uneven tone. Vitamin C in the form of L-ascorbic acid helps brighten the complexion while defending against environmental aggressors, while hyaluronic acid delivers deep hydration by supporting the skin’s moisture barrier.
Sustainability is also part of The Skin Diary’s long-term vision. The brand’s formulas are packaged in recyclable violet glass vials designed to protect the potency of active ingredients. Each vial is freshly compounded to help maintain stability while reducing unnecessary waste. Looking ahead, the brand aims to introduce a circular system that would allow its Miron glass packaging to be returned, sanitised and reused.
Age Defence retails at £92, and can be purchased directly online here. You can find out more about The Skin Diary, as well as browse and shop the full range of skincare right here.
