This is not one acid against another. The VI Peel contains TCA already. It is a fixed branded recipe — trichloroacetic acid, phenol, retinoic acid, salicylic acid and vitamin C — that arrives premixed and is applied the same way to everyone. A TCA peel is a compounded peel where the doctor chooses the concentration, decides how many coats to lay down, and stops when the skin reaches the endpoint they want. One is a recipe you cannot adjust. The other is adjustable, and depends almost entirely on the person applying it.
No trial has compared a VI Peel with a plain TCA peel. There is no head-to-head study, so nobody can tell you which one goes deeper, works better or is safer. What can be said is that plain TCA has a real published record going back decades, and the VI Peel has one paper: an uncontrolled, open-label study of 30 people in which the peel was given with Botox on the same day.
Neither one is FDA approved, and no chemical peel product is. FDA put it in its own words on 30 July 2024: "The agency has not approved any chemical peel products, and consumers should only consider using chemical peel products under the supervision of a dermatologist or licensed and trained practitioner." No peel has ever been cleared as a device either. FDA acts against sellers after the fact, usually over marketing claims. Nobody reviews the formula before it goes on sale.
The practical difference is knowing the number. With a TCA peel you can be told the concentration and how many coats were used, and there are published classifications you can hold that against. With the VI Peel you cannot: the manufacturer publishes the ingredient names but no percentages, which professional-use products are not required to do. That means the product's marketed depth cannot be independently checked by anyone.
The base chemistry is the same across all five: TCA, phenol, salicylic acid, retinoic acid and vitamin C. Precision Plus adds hydroquinone and kojic acid for pigment. Purify adds benzoyl peroxide, kojic acid and hydrocortisone for acne. You choose a variant, not a strength.
TCA is one of the oldest and best-documented peeling agents. It is often used on its own, and often layered over a keratolytic primer such as Jessner's solution, which is a mix of resorcinol, salicylic acid and lactic acid in ethanol.
The manufacturer's FAQ and product flyer list ingredients without concentrations. Professional-use products are exempt from the consumer ingredient-declaration requirements, which is legal and common. It does mean nobody outside the company knows the numbers.
Concentration is the visible variable, and it is the one you can ask about. Layering a second or third coat over an area changes depth without changing the bottle.
Any clinic page stating a specific depth for the VI Peel is asserting something the manufacturer has not published. It is also worth knowing that phenol, the classic deep-peel agent, is on the ingredient list — at an unpublished amount that is clearly small, since the protocol involves none of the monitoring a real phenol peel demands.
One widely used classification puts TCA at 35 to 50 percent in the medium-depth range, reaching the papillary dermis (the upper layer of true skin below the surface layer), and above 50 percent in the deep range, reaching the mid-reticular dermis. A second source bands it as very light at 10 to 20 percent, light at 20 to 30 percent, medium at 35 percent — usually combined with Jessner's or 70 percent glycolic — and deep above 50 percent. Both agree that above 50 percent is deep.
Neither the product nor any of its variants has FDA approval or clearance. A search of FDA's 510(k) database returns no chemical peel of any kind.
FDA's July 2024 communication named TCA at 50 to 100 percent among the strengths being sold direct to consumers, and a warning letter issued five days earlier, on 25 July 2024, to the seller Repare Skincare cited TCA skin peels at 15, 20, 25, 35, 50 and 100 percent. FDA's legal position was that these are unapproved new drugs, not that a particular percentage is banned.
Roberts and Miller, 2024, Journal of Drugs and Dermatology: 30 people, Fitzpatrick I to VI, single-arm, open-label, no control, no comparator, no blinding. The paper's funding and conflict-of-interest statement are not in the indexed record, so whether the manufacturer was involved cannot be established either way. Everyone received a VI Peel and Botox on the same day, and the study's purpose was to check the safety of the combination. Wrinkle, pigment and skin-tone scales all improved, but with the neurotoxin in the same session and no control group, none of it can be attributed to the peel.
In a pooled review of 12 randomized peel-versus-peel trials in acne with 387 participants in total, TCA against salicylic acid showed no difference (relative risk 0.89, 95% CI 0.73 to 1.10). Layering TCA over Jessner's beat TCA alone in a split-face trial of 24 women with melasma in Fitzpatrick IV to V. A split-face trial of 18 Korean women found 15 percent TCA and a 1550 nm fractional laser produced no difference in melasma at either 4 or 12 weeks. Against a Q-switched 532 nm laser for sun spots on the hands, in 45 people, the laser did better.
Post-care products are used through what the maker calls the full exfoliation week. No makeup or topicals for the first four hours. No exercise for 72 to 96 hours, or 7 days if you are prone to pigment changes. No swimming for 7 to 10 days, no direct sun for 7 days.
Published guidance puts re-epithelialization after a medium-depth peel at 7 to 10 days, usually from a single session, and expects redness for 15 to 30 days. Superficial peels settle in about 3 to 5 days and can be repeated sooner. Deep peels take 14 days or more.
That is a manufacturer protocol, not a trial result.
Published superficial-peel protocols in trials cluster at 3 to 6 sessions every 2 weeks. Medium-depth peels are typically single-session with a long recovery. Which pattern applies depends on the strength your doctor chooses.
A fixed recipe removes a variable, and removes a lever. With a branded blend, the solution in the bottle is the same for a thin-skinned 25-year-old with light freckling and a 55-year-old with thick, sun-damaged skin. What changes between them is the number of passes and the operator's technique, not the chemistry. That is a genuine advantage in consistency: a VI Peel in one clinic should be much the same product as a VI Peel in another.
With a compounded TCA peel, none of that consistency exists. Two clinics can both advertise "a TCA peel" and deliver very different treatments — 15 percent on one visit and 35 percent with two coats on another are not comparable. But the thing you lose in consistency you gain in fit. A doctor can start light on a first visit, see how the skin behaves, and go stronger next time. A fixed recipe cannot be dialed down for someone at higher risk of pigment problems.
There is one more asymmetry worth naming. With the compounded peel you can be told the number, and there is published literature to place it against. With the branded blend there is no number to be told. That is not a scandal — professional products are simply not required to publish concentrations — but it does mean the marketed depth claim cannot be checked.
The five VI Peel facial variants share the same base. Original and Advanced have literally the same published ingredient list, and are separated only by the age group and indication they are marketed for. If a clinic tells you Advanced is stronger, that is not supported by anything the manufacturer has published.
The other three are the base plus bolt-on actives. Precision Plus adds hydroquinone and kojic acid, both pigment-directed. Purify adds benzoyl peroxide, kojic acid and hydrocortisone, all acne-directed. Purify with Precision Plus combines the two sets. So the meaningful choice among the variants is which extra ingredients you get, not how deep the peel goes.
By contrast, a TCA peel has no variants. It has a number.
The published guidance is graded by depth, and neither product escapes it. A 2026 narrative review covering Fitzpatrick IV to VI says superficial peels are frequently used in this group with good satisfaction, medium-depth peels "require caution," and deep peels should be avoided altogether in dark skin. One widely cited reference starts the caution at Fitzpatrick III rather than IV; both agree the direction.
For TCA specifically there are actual numbers, and they are modest studies. In a split-face trial of 18 Korean women with skin types III to IV, 15 percent TCA produced post-inflammatory hyperpigmentation in 28 percent of patients at 4 weeks, resolving in all but one by 12 weeks. In 40 African patients, 77.5 percent of them Fitzpatrick V, a sequential high-concentration glycolic and TCA protocol produced transient hyperpigmentation in 12.5 percent, with irritation in 77.5 percent and no scarring. Pigment change is described in the complications literature as the most common complication of TCA peeling.
The VI Peel is marketed as safe and effective for all skin tones. No trial supports that, and the single 30-person study was not designed to measure pigment safety. Its own aftercare tells people prone to hyperpigmentation to extend the exercise restriction from 72 to 96 hours out to 7 days. Priming the skin beforehand — hydroquinone, sometimes with tretinoin, for two to four weeks — is a near-universal feature of the dark-skin protocols that worked in published studies, and is something to ask about with either treatment.
If you get cold sores, say so when you book, not on the day. Antiviral medicine has to be started in advance, because reactivation happens while the skin is healing and the drug needs to already be at therapeutic levels by then. In the best published data — 181 patients having perioral peels or dermabrasion — half of those with a cold sore history and no prophylaxis had an outbreak, against 8.3 percent of those given standard acyclovir, and none after a higher-dose regimen was adopted. Even 6.6 percent of people with no history at all had one. Every published protocol starts the antiviral before, or at the latest on, the day of the procedure.
Tell your provider if you have taken isotretinoin (Accutane) within six months. The six-month rule comes from the drug's package insert, not from a trial, and a 2017 systematic review found the whole idea rested on three small case series from the mid-1980s. Both a US and an Indian consensus panel have since said there is insufficient evidence to delay superficial peels. The US panel did not extend that to medium-depth or deep peels, so this is a conversation with your doctor rather than a rule you can assume either way.
Ask what concentration is being used and how many coats are planned, if you are having a compounded TCA peel. Ask which variant and why, if you are having a VI Peel. Mention allergy to aspirin, hydroquinone or phenol; immune suppression; autoimmune or liver disease; a history of keloid scarring; and any active skin infection or open area.
Ask who is applying it and what training they have. FDA's own wording is that peels should be used under the supervision of a dermatologist or licensed and trained practitioner. There is no federal licence for this. Rules are set by each state, and the line drawn is usually depth: Ohio, for example, limits estheticians to 30 percent solution or less at a pH of at least 3, and to removing stratum corneum cells only; Texas defines medium and deep peels as medical procedures because they penetrate living tissue. Check your own state's board rather than assuming.
Plan for sun. Alpha hydroxy acids measurably increase sun sensitivity — FDA cites an 18 percent increase in sensitivity to reddening after four weeks of use, with sensitivity to UV cell damage roughly doubling, and recommends sun protection during use and for a week afterwards.
These need same-day assessment. Chemical burns deeper than intended are documented, including a case where unsupervised acid applied near the eye caused an eyelid deformity that required surgery.