Exfoliating acids

A cheap, effective weekly resurfacing treatment with the acid percentages right on the label. Respect the ten-minute limit and the sunscreen rule and it does real work on the look of texture and dullness. Used carelessly it will burn, so this is a tool for people who follow directions.

The value floor for a glycolic toner: a disclosed, sensible daily dose in a bottle that lasts for months. Glycolic raises sun sensitivity, so daytime sunscreen is part of the deal.

A well-built cosmetic azelaic that pairs it with a low dose of salicylic for a bit more surface work. It costs more than the bargain suspensions, and what you pay for is the smoother texture and the added acid. A tidy, tolerable pick for the look of a more even complexion.

A well-formulated leave-on acid serum in good airless packaging, with a broad AHA and BHA blend doing well-evidenced surface work. The price is prestige and the total acid percentage is disclosed only as a blend. If you want a nightly exfoliant and do not mind paying for the finish, it performs.

A well-dosed BHA with a delivery twist that earns its slight premium over the bargain liquids, aimed at the look of clearer pores with less sting. A sensible pick if a straight salicylic acid runs your skin dry.

A genuine leave-on exfoliating serum at a throwaway price, with the acid level right on the label. A smart first AHA for skin that finds glycolic too sharp.

The gentle end of the acid aisle, honestly dosed and cheap. The evidence for mandelic is thinner and younger than for glycolic or lactic, so treat it as a patient, low-drama pick rather than the strongest resurfacer.

A capable acid-plus-brightener serum that pairs exfoliation with two pigment actives, wrapped in a prestige price. The undisclosed doses and the alcohol base are the knocks, and cheaper glycolic and tranexamic options cover most of the same ground.

A cheap, honestly dosed way to work azelaic into a routine for the look of a more even complexion. The texture is divisive and it is a cosmetic-strength suspension, not the prescription kind. At this price, with the percentage on the label, it is easy value.

The reference BHA of the category: one disclosed, well-dosed active for the appearance of clearer, more refined-looking pores, with the longest track record of any liquid exfoliant. Almost nothing does the core job better.

A well-evidenced antioxidant serum aimed squarely at oilier skin, with the salicylic acid earning its place rather than padding the label. It costs like the SkinCeuticals name, and the tinted dropper still browns over time. If your skin does not get on with the richer C E Ferulic, this is the version to reach for.

One of the best value plays on the whole board: a properly dosed, disclosed glycolic treatment for the price of a coffee. Ease in slowly and pair it with daytime sunscreen.

The softest way to add an exfoliating acid to a routine, with a genuine niacinamide dose alongside for tone and shine. Reach for it if AHAs and BHAs are too much, not if you want serious resurfacing.

A capable, well-evidenced acid-and-brightening serum aimed at texture and tone, wrapped in a clinical-brand price. The active levels are undisclosed and the arbutin is more garnish than dose. It works, but you are paying a steep premium over cheaper acids that do the core job.

A pleasant, hydrating toner that markets itself on acids it barely contains. Fine as a gentle first-step splash, but do not expect the surface work a proper AHA or BHA does.