The difference is where the peel finishes. One ends when you leave the clinic; the other keeps going at home for several days. A VI Peel is applied in the office, left on your skin, and everything after that is aftercare - products to protect and settle the skin while it sheds. The ZO 3-Step Peel is named for its three steps, and the third one happens at home: the clinic sends you away with a cream to keep applying over the following days as part of the treatment itself, not as a comfort measure.
That structural difference is the thing to decide about, because it changes what is being asked of you. With one appointment plus aftercare, the result depends mostly on the person who applied the solution. With an appointment plus a supervised home phase, part of the result depends on you following instructions correctly for several days, on your own, without anyone watching. If you are the sort of person who reads the sheet and does exactly what it says, that is fine. If you know you will forget on day two, that matters.
No trial has compared these two peels, and neither has a meaningful independent evidence base. The VI Peel has exactly one peer-reviewed publication: an uncontrolled, open-label study of 30 people who were given the peel and botulinum toxin on the same day, so the peel's own effect cannot be separated out. No published trial of the ZO 3-Step Peel has been identified at all. Nothing about either product has been measured against the other, or against a standard doctor-mixed peel.
Neither is FDA approved, because no chemical peel product is. In a drug alert dated 30 July 2024, the FDA stated: "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." That is the position for the entire category. It does not mean peels are unsafe or unregulated; it means the formula itself never went through an approval process, and the FDA's enforcement hook is the claims a seller makes rather than the chemistry.
Sold to clinics in sealed variants aimed at different concerns, with a matching take-home post-care kit.
The first two steps are performed in the clinic. The third is completed by you at home over the days that follow.
No makeup or topical products for the first four hours after treatment. After that four-hour window, the post-care kit begins.
The clinic performs the first two steps and hands over the third with instructions for the following days.
Post-care kit products only for the full shedding week, SPF 50 applied evenly, cool water and gentle cleansing, no exercise for 72 to 96 hours - or seven days if you are prone to hyperpigmentation - no swimming for 7 to 10 days and no direct sun for seven days.
The home step is described as part of the peel rather than as recovery care. That means missing it, or doing it wrong, is not the same as skipping a moisturizer.
That is the manufacturer's own ingredient list for the facial formulas. The Precision Plus variant adds hydroquinone and kojic acid; the Purify variant adds benzoyl peroxide, hydrocortisone and kojic acid. No percentages are published for any of them.
Clinic pages routinely quote a specific acid mix and a specific percentage for this peel. None of it can be traced back to ZO. Any figure you are quoted for its strength should be treated as a clinic's claim rather than a manufacturer's disclosure.
No peel agent holds a drug approval, and no chemical peel has ever been cleared as a device.
Nothing about a three-step structure or a home phase changes the regulatory position.
Roberts and Miller, 2024: 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. Reported improvements were 60 percent on a wrinkle severity scale, 59 percent on uniformity of pigment and 70 percent on skin tone. The wrinkle number cannot be attributed to the peel. The assessment timepoint is not stated.
Searches for peer-reviewed studies of ZO peels return nothing. That is an absence of evidence, not evidence that it does not work.
The manufacturer recommends a series of three to six peels, every four to six weeks, then about four a year for maintenance. That is a protocol, not a trial result.
No manufacturer-published session count or interval could be confirmed. Ask the clinic what course they recommend and on what basis.
Everything else about these two products is roughly the same kind of thing; the protocol shape is not.
Both are branded professional peels. Both are bought by the clinic as a kit. Both come with take-home products. Both are unpublished formulas from companies that are not required to publish them. If you laid the two marketing pages side by side, the claims would be broadly interchangeable.
What is genuinely different is who is doing the work after the appointment ends. A peel with an active home step distributes the outcome between the clinician and you. That is not a criticism of the design - spreading a treatment over days is a legitimate way to get an effect with a gentler single application, and plenty of dermatology works that way. But it does mean the informed-consent conversation should cover more than the appointment. You need to know what you are applying, for how many days, what it should look like while you do it, and what would make you stop.
The practical test is simple. Ask the clinic to describe day one, day two, day three and day four, out loud, before you book. If they cannot, the home phase is not being supervised in any real sense, and the "supervised" part of a supervised home phase is what makes it safe.
With both of these products, the ingredient percentages are not public, and that is legal.
Products sold for professional use only are exempt from the consumer ingredient-declaration requirements. That single rule explains why no branded professional peel prints its concentrations. It applies equally to both peels here, and to their competitors.
For the ZO peel there is a second gap: the manufacturer does not publish the protocol or the formula in a place a member of the public can read. The specific acid list and percentage that appear on clinic pages cannot be traced back to the company, so they should not be relied on. If the strength of the peel is load-bearing in your decision - because you have deeper skin, because you scar, because you had a bad reaction to something before - the correct move is to ask the clinic for the manufacturer's instructions for use in writing.
The consequence of undisclosed concentrations is concrete: no one outside either company can independently classify how deep these peels go. "Medium-depth" is a description the manufacturers use, not one anyone has verified.
There is no reliable published price for either peel.
No professional society survey, no government dataset and no manufacturer list price exists for any branded chemical peel. Everything available is clinic menu pricing, which cannot honestly be averaged into a figure. For chemical peels as a whole category, the most recent separate national average from the American Society of Plastic Surgeons is $519 from 2020 - a surgeon fee only, from member surgeons, excluding facility costs - and consumer self-reported data puts a chemical peel at $438 from several hundred reviews on a page last updated in January 2023. Neither is specific to a brand, and neither separates superficial from medium from deep.
One thing worth checking on the invoice: with a peel that has a home phase, ask whether the take-home products are included in the quoted price or billed separately. That is the most common place the two treatments diverge on cost.
Published guidance on peels in darker skin is graded by depth, and neither of these products has a verified depth.
A 2026 narrative review of noninvasive treatments in Fitzpatrick skin types IV to VI found that superficial peels are frequently used in this group with great patient satisfaction, that medium-depth peels require caution, and that deep peels should be avoided altogether in dark skin. The whole evidence base for peels in skin of color is thin: a scoping review screened 473 studies and found only 7 that met inclusion criteria.
The VI Peel manufacturer states that all its treatments are safe and effective for all skin tones. No published trial supports that for this product, and the manufacturer's own aftercare instructions carve out patients "prone to hyperpigmentation" with a longer exercise restriction. Take that as the more useful signal.
If your skin is deeper in tone, the safest starting point is a superficial agent with a track record - salicylic acid, mandelic acid or glycolic acid - and priming the skin with a topical beforehand, which is a feature of nearly every successful protocol published in darker skin.
If you get cold sores, say so at the time of booking, not on the day. Antiviral medicine has to be started before the procedure, because reactivation happens while the skin is healing. In the strongest study on this, patients with a history of oral herpes having a perioral peel or dermabrasion with no prophylaxis had a 50 percent outbreak rate; with standard antiviral prophylaxis that fell to 8.3 percent, and no further outbreaks were seen after a higher-dose regimen was introduced. In the same group, 6.6 percent of patients with no history of cold sores developed one anyway. Active cold sores and a history of herpes are both on the VI Peel's own contraindication list.
Ask for the home instructions in writing before you commit, and check you will actually be at home and able to follow them. A peel with a multi-day home phase is a poor choice for the week of a wedding, a holiday or a work trip.
Tell your provider about isotretinoin (Accutane) in the last six months, any allergy to aspirin, phenol or hydroquinone, immune suppression, autoimmune or liver disease, and any history of keloid scarring or poor healing. These are on the manufacturer's contraindication list or in standard peel teaching.
Ask who will be applying it and what they are licensed to do. That is set state by state, and medium-depth and deep peels are medical procedures nearly everywhere.