Retinol vs retinoids — what the difference is and which to use.

Retinoids are a family of vitamin A derivatives used in skincare and dermatology. The category includes everything from over-the-counter retinol to prescription tretinoin — and the difference between them is not just marketing. They are distinct molecules with different potencies, conversion steps, and evidence profiles. Understanding what separates them helps explain why some retinoid products produce dramatic changes and others produce almost nothing.

The retinoid family

All retinoids ultimately work by delivering retinoic acid to the skin — the biologically active form that binds to nuclear receptors in skin cells and produces the effects the category is known for. The distinction between retinoids is how many steps of conversion are required, and therefore how much retinoic acid arrives at the skin cells.

Tretinoin (all-trans retinoic acid). Prescription strength in most jurisdictions. It is retinoic acid — the active form directly — and requires no conversion. Effects are rapid and measurable, and the evidence base is the most extensive in the category. Tretinoin is the gold standard against which other retinoids are compared. It is also the most likely to cause irritation, peeling, and the adjustment period dermatologists call "retinisation."

Retinaldehyde (retinal). One conversion step away from retinoic acid. More potent than retinol, less potent than tretinoin. Significantly less studied than either, but the available evidence is positive — particularly for acne and anti-ageing. It is available over the counter at low concentrations. Less commonly found, and typically more expensive than retinol. Better tolerated than tretinoin.

Retinol. Two conversion steps from retinoic acid — first to retinaldehyde, then to retinoic acid. The most widely available over-the-counter retinoid. Slower-acting than tretinoin, because less retinoic acid arrives at the cellular target per unit applied. Well-evidenced at concentrations of 0.1–1%. For most people, this is the right starting point.

Retinyl esters (retinyl palmitate, retinyl propionate). Three or more conversion steps from retinoic acid. The mildest and most stable retinoid forms. Often found in products marketed as "gentle retinoid" or "retinoid alternative." The mild side-effect profile is real; the degree of efficacy at typical concentrations in consumer products is modest. Useful for very reactive skin that cannot tolerate retinol; less useful for anyone expecting retinol-level results.

What they all do — and why the potency difference matters

All retinoids, when converted to retinoic acid in the skin, work through the same pathway: they bind to retinoic acid receptors (RARs) in the nucleus of skin cells, triggering changes in gene expression.

The effects are the same in principle across the family: increased cell turnover, upregulation of collagen synthesis, normalisation of follicular keratinisation, and reduction in the enzymes that break down collagen with UV exposure.

The practical difference is speed and magnitude. Tretinoin at 0.025% produces measurable changes in collagen and cell turnover within weeks. An equivalent result from retinol typically requires a higher concentration and months of use. Retinyl palmitate at typical cosmetic concentrations may produce minimal effect under normal skin pH and enzyme conditions.

For clinical acne treatment, melasma management, or significant photodamage, the evidence supports tretinoin. For general anti-ageing maintenance, regular retinol use is well-supported and appropriate for most people without a prescription.

What to choose

No prior retinoid experience, healthy barrier: begin with retinol at 0.025–0.05%. The two-conversion-step pathway gives the skin time to adapt. Introduce once a week for the first month.

Established retinol tolerance, specific goals (acne, texture, significant ageing signs): consider retinaldehyde as a bridge to prescription-strength treatment, or discuss tretinoin with a dermatologist. The prescription path is not complicated — it is one appointment.

Reactive, sensitised, or compromised barrier: stabilise the barrier first with fragrance-free barrier-supportive products for four to eight weeks. Then start with retinyl palmitate if even low-concentration retinol proves irritating — it may not produce dramatic effects, but it will not worsen a compromised barrier. Build up from there.

Already using tretinoin: there is no reason to step back to retinol unless tolerability is a significant issue. Tretinoin is the most evidence-backed option in the category.

The barrier first

Retinoids accelerate cell turnover, which temporarily thins the stratum corneum — the outermost barrier layer. On an already-compromised barrier, this causes net damage rather than improvement. The sequence matters: establish a stable barrier baseline before introducing any retinoid. That means a consistent routine — gentle cleansing, barrier-supporting moisturiser — maintained for weeks before the first retinoid application.

The Lux & Glo ritual is designed as that baseline. It does not contain a retinoid, because the foundational step — building and maintaining a healthy barrier — is the prerequisite for any retinoid to work as intended.