What is lactic acid in skincare?
Lactic acid is an alpha-hydroxy acid originally derived from milk, now usually produced by fermentation. Its molecule is larger than glycolic acid’s, so it penetrates more slowly and irritates less – which makes it the AHA of choice for drier or more reactive skin.
It is also part of the skin’s own natural moisturising factor, so unlike most exfoliants it hydrates while it resurfaces. Research shows it increases ceramide production in the stratum corneum.
What skin concerns does lactic acid treat?
It smooths dullness, flakiness and rough texture, fades pigmentation and post-acne marks, and softens fine lines. Because it improves barrier lipids at the same time, it suits dry, mature and mildly sensitive skin better than stronger acids.
A controlled study pairing lactic acid with ceramides found measurable gains in both moisturisation and even shedding within two weeks.
What ingredients are best paired with lactic acid?
Ceramides are the standout partner, since lactic acid supports the skin making its own. Hyaluronic acid, glycerin, squalane and panthenol round out the hydration side.
Niacinamide layers comfortably, and vitamin C works well on alternate mornings. Keep it out of the same step as retinoids or BHAs while your skin adjusts, start twice weekly, and use SPF daily. Take our Skin Quiz.
What are fine lines?
Fine lines are the earliest visible sign of skin ageing: shallow creases that appear where skin is thinnest and most expressive – around the eyes, across the forehead, and at the corners of the mouth.
They differ from established wrinkles in that they are often still dynamic, showing mainly when you smile or squint, and are frequently worsened by dehydration. That makes them the most responsive stage to treat.
What causes fine lines?
Intrinsic ageing does part of the work: collagen production falls by roughly one per cent a year from the mid-twenties, elastin degrades, and the dermal matrix thins so skin no longer springs back.
The larger share is external. Ultraviolet exposure accounts for the majority of visible facial ageing, and pollution, smoking, poor sleep, sugar-driven glycation and repeated facial movement all accelerate it. Dehydration makes existing lines look deeper than they are.
What ingredients are best for fine lines?
Retinol and prescription retinoids have the strongest evidence for stimulating collagen and smoothing texture. Vitamin C protects against free-radical damage while supporting collagen synthesis, and peptides signal the skin to rebuild.
Pair those with hyaluronic acid and ceramides for immediate plumping and barrier support, niacinamide for tone, gentle AHAs for surface renewal, and coenzyme Q10 as an antioxidant. Daily broad-spectrum SPF protects everything else you are doing. Take our Skin Quiz.
