It's Skin Power 10 Formula LI Effector bottle, a gentle fragrance-free licorice brightening ampoule with polyglutamic acid
Promising for Dullness
What Makes This Different

It's the gentlest, simplest member of the Power 10 line — a fragrance-free, alcohol-free serum built around licorice root for dual brightening and soothing, with polyglutamic acid for hydration. The pared-back, sensitive-skin-friendly formula and budget price make it a rare gentle brightener that almost any skin type can use.

It's Skin

It's Skin Power 10 Formula LI Effector Review

Gentle Licorice Brightener
serum ampoule k beauty Paraben Free Fungal Acne Safe Vegan Not Cruelty Free

The gentle one in the lineup. This fragrance-free, alcohol-free licorice serum brightens dullness and calms redness with one of skincare's most reliable, well-tolerated brighteners, plus polyglutamic acid for hydration. It's mild and gradual rather than dramatic, but for sensitive or reactive skin that can't handle stronger brighteners, it's a genuinely smart, low-risk, budget-friendly pick.

$10.00
1.01 fl oz / 30ml
4.3 ★★★★★
3,000 reviews
Made in South Korea Launched 2010 All-year use PAO: 12 months
Buy at Amazon ♥
Run it through our tools Clashes with my routine? Pregnancy-safe? Find a cheaper dupe Patch-test it first

With no published clinical testing of this specific effector, the assessment relies on the line's broad popularity and the well-regarded gentle-brightening and soothing profile of licorice root. The mild brightening and calming benefits are well supported; the degree and speed of tone improvement will vary by individual and depend heavily on consistent sunscreen use.

Verdicts

How well it fits each concern

Verdict by concern tap a concern for the case

Promisingfor DullnessGlycerin has trial-level evidence for dullness but no guideline or regulatory standing yet — promising, short of a recommendation; the other actives here are not yet assessed for it.Moderate evidenceGentleNo reviews collected yet

The case for it

  1. Glycerin has trial-level evidence for this concern but no guideline or regulatory standing yet.
  2. It is present at an effective concentration, declared or high in the ingredient list.
  3. The formula carries none of the triggers this concern is sensitive to.

What would change this: Guideline or regulatory standing for the active on this concern would move this from a promising bet to a recommendation.

Same rule for everyone. “Promising” is the verdict on 7,858 of 45,024 concern verdicts across the catalog; rule R9p decided 7,858 of them. Unchanged since September 5, 2026, engine 5.1.1.

Brand or formulator? Disclose a concentration or correct a fact →

Show the work
Rule
R9p — 0.5.0: 'Unproven' beside three filled dots read as one question answered twice with opposite words (7,018 rows). The chip measures standing, the dots measure trial volume; where the row carries at least one RCT or a tier-2 source (moderate dots) and the active is present at a working level, the honest word is Promising. Unproven is reserved for plausible-standing rows with limited or weak evidence, or an under-dosed form. Same rank as Unproven — a bet either way; the dots order them. · the full register
Carrying active
Glycerin
Standing
plausible — trials support it
Form
adequate — studied range 2–20%, from the trials on the row; needs leave-on contact; judge it after ~1 weeks
Tolerability
gentle
Row checked
against its sources on July 17, 2026 (evidence table ev-2026.09-r228)

The studies behind the evidence row

  • Harry's Cosmeticology / Baran & Maibach Textbook of Cosmetic Dermatology — humectant, emollient and occlusive classification — standard reference text
All dullness products →
Unprovenfor HyperpigmentationLicorice Root Extract has early or mechanistic evidence for hyperpigmentation — a reasonable bet, not a recommendation; the other actives here are not yet assessed for it.Limited evidenceGentleNo reviews collected yet

The case for it

  1. Licorice Root has early or mechanistic evidence for this concern, not trial-backed standing.
  2. It is plausibly present at a working level, though the concentration is not declared.
  3. The formula carries none of the triggers this concern is sensitive to.

What would change this: A declared concentration would move this to a firmer reading of the dose.

Same rule for everyone. “Unproven” is the verdict on 1,111 of 45,024 concern verdicts across the catalog; rule R9 decided 1,111 of them. Unchanged since September 5, 2026, engine 5.1.1.

Brand or formulator? Disclose a concentration or correct a fact →

Show the work
Rule
R9 — Plausible-tier actives alone do not earn a recommendation, and 'not for this' would overstate the case against them. 'Unproven' with the evidence dots lets the reader judge the bet (added 0.2.0 after the first shadow run put a 10% niacinamide serum at 'not for this' for hyperpigmentation). 0.5.0: the closing clause reads the other heroes — "nothing else here addresses it" only when every other active has a researched 'none' row; "not yet assessed" when that is the truth. Rows whose dots read moderate or better now reach R9p first. · the full register
Carrying active
Licorice Root
Standing
plausible — trials support it
Form
plausible — studied range 4–20%, from the OTC monograph or label; needs leave-on contact
Tolerability
gentle
Row checked
against its sources on July 17, 2026 (evidence table ev-2026.09-r228)

The studies behind the evidence row

All hyperpigmentation products →
Good choicefor SensitivityNo fragrance, drying alcohol, declarable allergens or sensitising preservatives in this ampoule — the profile sensitive skin looks for.Not yet assessedGentleNo reviews collected yet

The case for it

  1. Glycerin has no evidence row yet for this concern — it is in the research queue.
  2. The formula carries none of the triggers this concern is sensitive to.

What would change this: A researched evidence row for the lead active would replace this with a verdict.

Same rule for everyone. “Good choice” is the verdict on 1,938 of 45,024 concern verdicts across the catalog; rule F2 decided 1,938 of them. Unchanged since September 5, 2026, engine 5.1.1.

Brand or formulator? Disclose a concentration or correct a fact →

Show the work
Rule
F2 — Gentle = no weighted deduction fired and fit ≥ 90. · the full register
Carrying active
Glycerin
Standing
not assessed
Form
plausible
Tolerability
gentle
All sensitivity products →
Not for thisfor Dark SpotsThe actives here have been researched for dark spots and the evidence does not support the claim.Not yet assessedGentleNo reviews collected yet

The case for it

  1. Licorice Root has been researched for this concern and the evidence does not support it.
  2. It is plausibly present at a working level, though the concentration is not declared.
  3. The formula carries none of the triggers this concern is sensitive to.

What would change this: A declared concentration would move this to a firmer reading of the dose.

Same rule for everyone. “Not for this” is the verdict on 488 of 45,024 concern verdicts across the catalog; rule R10 decided 488 of them. Unchanged since September 5, 2026, engine 5.1.1.

Brand or formulator? Disclose a concentration or correct a fact →

Show the work
Rule
R10 — Researched and found wanting is a different sentence from unresearched (R11). · the full register
Carrying active
Licorice Root
Standing
none
Form
plausible
Tolerability
gentle

The studies behind the evidence row

All dark spots products →

A verdict is DermApproved’s assessment of how well a product’s ingredients fit a concern — never a claim about what the product treats. Evidence dots and collected reviews sit beside it and are never blended in. Rules 0.5.1 · evidence table ev-2026.09-r228 · how we decide

Assessment

Pros & Cons

Pros

  • ✓ Genuinely gentle, fragrance-free and alcohol-free
  • ✓ Licorice soothes redness as it brightens
  • ✓ Suits nearly all skin types, including sensitive
  • ✓ Polyglutamic acid adds lasting hydration
  • ✓ Very affordable
  • ✓ Short, clean ingredient list

Cons

  • ✗ Brightening is mild and gradual
  • ✗ Won't fade stubborn dark spots or melasma
  • ✗ Single-active formula, not a multitasker
  • ✗ Requires consistency and daily sunscreen
  • ✗ Subtle results may underwhelm some
Review

Full Review

Most brightening serums come with a built-in catch: the actives that work fastest — high-strength vitamin C, potent acids, hydroquinone — tend to be the same ones most likely to sting, flush, or send reactive skin into open rebellion. That leaves sensitive complexions stuck choosing between results and comfort. There is something quietly clever, then, about the It's Skin LI Effector, the licorice member of the long-running Power 10 line. It takes the opposite tack: a short, fragrance-free, alcohol-free formula built around one of the gentlest reliable brighteners in the whole category. It will not wow you with speed, but it solves a real problem for people whose skin pushes back against everything stronger.

The entire formula essentially hinges on licorice root extract, sitting second in the ingredient list at a meaningful concentration, and it is a well-chosen anchor. Licorice does two genuinely useful things at once. Its glabridin content gently inhibits tyrosinase, the enzyme that drives melanin production, which softens dullness and minor unevenness over time, while glycyrrhizin delivers real anti-inflammatory, soothing activity that calms redness and irritation. That dual brightening-and-soothing action is precisely what uneven, reactive skin wants — it nudges tone in the right direction without provoking the flare-ups that harsher brighteners so often cause. Supporting it is polyglutamic acid, a high-molecular-weight humectant that clings to surface water even more tenaciously than hyaluronic acid, plus glycerin, so the serum hydrates and plumps as it works. The lightweight gel-fluid texture absorbs cleanly and leaves no tacky residue, which makes it easy to layer.

What I appreciate most here is the restraint. The Power 10 system is built as a mix-and-match lineup of single-concern effectors, and several of them lean botanical and busy. This one is the opposite: no fragrance, no alcohol, no essential oils, nothing superfluous. That deliberate minimalism is exactly why it is one of the few brightening serums I would comfortably suggest for genuinely sensitive, redness-prone skin. It is a refreshing reminder that a short ingredient list is frequently a feature rather than a shortcoming, and that the smartest formulating decision is sometimes to leave things out. As an established line that has been around since 2010, it has had plenty of time to prove that this pared-back approach holds up.

Now the honest expectation-setting, because this is where the product asks for patience. Licorice is a gentle, gradual brightener, and gentle means modest. This will not erase stubborn dark spots, fade entrenched melasma, or deliver the dramatic correction of a potent pigment treatment or a professional procedure. What it does is soften overall dullness and minor unevenness across roughly six to eight weeks of consistent use, while calming redness somewhat sooner — the soothing benefit shows up quickly, the tone benefit takes its time. If you are dealing with significant hyperpigmentation or deeply set dark spots, this alone will not get you there, and you will want stronger actives or professional help layered into your routine. As a daily maintenance brightener, and especially as one sensitive skin can actually tolerate without drama, it does its modest job reliably and well.

The non-negotiable companion, as with any tone work, is sunscreen. Brightening without daily SPF is like bailing a leaky boat without plugging the hole — UV exposure simply drives the pigmentation the licorice is working against, and you spend weeks running in place. Paired with a good daily sunscreen, this gentle serum becomes part of a sensible, low-irritation even-tone routine that genuinely moves the needle over time. The single-active simplicity also means it is not a multitasker; it does one thing gently rather than several things at once, which is the trade-off you accept for the gentleness.

On value, it is hard to argue with. This is a genuinely affordable serum, and for the price you get a fragrance-free, well-tolerated brightening-and-soothing option that almost any skin type can use, sensitive complexions included. With a substantial review base behind it, it is also a known, low-risk quantity rather than a gamble. The realistic ceiling on results keeps it from being a hero product, but the floor — gentle, soothing, never irritating — is exactly what reactive skin needs.

So here is where it nets out: a smart, budget-friendly, genuinely gentle brightening serum for people who have been burned, sometimes literally, by harsher actives. Do not expect speed or dramatic spot-fading; expect gradual, soothing, even-tone support from a clean formula that will not fight you. For sensitive, redness-prone skin that wants to address dullness without risk, that is a real find — the kind of unglamorous, well-judged little product that quietly earns a permanent slot in a routine and never causes a problem.

A few notes on getting the most from it. Because the effector is a single-concern serum, it plays best as one layer in a built-out routine rather than a standalone fix — applied after cleansing and a hydrating toner, before a moisturizer that seals everything in, and ideally paired with other gentle hydrators rather than a pile of competing actives. It layers happily with niacinamide and hyaluronic acid, and there is no acid or retinoid here to worry about conflicting with, which makes it an unusually low-drama addition for anyone still nervous about combining products. The Power 10 system's whole appeal is this mix-and-match flexibility, and the licorice effector is the member you reach for when calming and brightening are the goal and irritation is the thing you most want to avoid. Twice daily is fine, though even once-nightly will show the gradual tone benefit if you stay consistent and keep that sunscreen non-negotiable. For reactive skin that has spent money on harsher brighteners only to abandon them after a week of stinging, the appeal of something this forgiving is hard to overstate — it is the rare brightening step you can genuinely set and forget, trusting it to do quiet, cumulative good without ever becoming the reason your face is red.

Formula

Key Ingredients

The hero actives that drive this product's performance.

IngredientFunctionEvidence
Licorice Root (Glycyrrhiza Glabra) Extract Second in the formula and the clear star, licorice root delivers a dual brightening-and-soothing action — glabridin gently inhibits excess pigment while glycyrrhizin calms redness and irritation, making this effector a mild antidote to dullness and uneven, reactive tone. Limited for Hyperpigmentation
Polyglutamic Acid A high-molecular-weight humectant that holds water at the skin surface even more tenaciously than hyaluronic acid, giving this otherwise simple serum a hydrating, plumping base that helps brightened skin look fresher. Not yet assessed
Glycerin A core humectant that reinforces the polyglutamic acid's hydration, keeping the lightweight formula comfortable and ensuring the licorice sits on well-moisturized, calm skin. Plausible mechanism for Dullness
Full INCI List

Water, Glycyrrhiza Glabra (Licorice) Root Extract, Butylene Glycol, Glycerin, Dipropylene Glycol, Carbomer, Ethyl Hexanediol, Triethanolamine, Ethylhexylglycerin, Polyglutamic Acid, Disodium EDTA

Safety & Formulation Facts
✓ Pregnancy Safe ✓ Fragrance Free✓ Alcohol Free✓ Oil Free✓ Silicone Free✓ Paraben Free✓ Sulfate Free✗ Cruelty Free✓ Vegan✓ Fungal Acne Safe
Compatibility

Skin Match

Best For
Works For
Routine Step

treatment

Time of Day

AM & PM

Layering Tips

Pat a few drops onto clean skin before moisturizer. As a gentle, fragrance-free effector it layers well with other serums and suits sensitive skin; pair with daily sunscreen, which is essential for any brightening or even-tone goal.

Results Timeline

Immediate soothing and hydration; gradual brightening and more even tone over 6-8 weeks of consistent use with sunscreen.

Pairs Well With
moisturizerserumsunscreen
Planning a combo? Check it against what you already use
Sample AM Routine
  1. Gentle cleanser
  2. It's Skin Power 10 Formula LI Effector
  3. Moisturizer
  4. SPF
Sample PM Routine
  1. Gentle cleanser
  2. It's Skin Power 10 Formula LI Effector
  3. Moisturizer
Evidence

Science & Expert Perspective

The Science

The serum's efficacy rests almost entirely on licorice root (Glycyrrhiza glabra) extract, placed second at a meaningful concentration. Licorice offers two evidence-supported skin actions: glabridin inhibits tyrosinase, the enzyme driving melanin production, giving it a gentle depigmenting, brightening effect, while glycyrrhizin (and related compounds) provide anti-inflammatory, soothing activity that calms redness — a combination well suited to uneven, reactive skin. The benefit is mild and gradual compared with higher-strength brighteners like potent vitamin C or hydroquinone, but correspondingly better tolerated. Polyglutamic acid, a high-molecular-weight humectant, holds water at the skin surface effectively, supported by glycerin and butylene glycol for hydration. The formula is notably minimal — fragrance-free, alcohol-free, and free of essential oils — which keeps the sensitizer load very low and broadens its suitability to sensitive skin. As with all brightening, results depend on consistent use alongside daily sunscreen, since UV exposure drives the pigmentation the licorice works against. Overall, a sensibly minimal, gentle brightening-and-soothing formula whose realistic strength is mild, well-tolerated tone support rather than intensive correction.

Dermatologist Perspective

Dermatologists regard licorice root, via glabridin and glycyrrhizin, as a gentle, well-tolerated brightening and anti-inflammatory ingredient, useful for mild hyperpigmentation and for calming redness, and they would view this fragrance-free, alcohol-free formula as an unusually sensitive-skin-friendly brightening option. They would set realistic expectations: licorice is mild and gradual, suitable for maintenance and minor unevenness rather than for stubborn dark spots or melasma, which typically need stronger actives or in-office treatment. Clinicians would stress that any brightening effort is undermined without daily broad-spectrum sunscreen, making SPF the essential partner. For reactive, redness-prone, or sensitive skin that can't tolerate harsher brighteners, they would consider it a sensible, low-risk, affordable choice.

Guidance

Usage & Recommendations

How to Use

After cleansing, pat a few drops onto clean skin and follow with moisturizer. It's gentle enough for morning and night and layers well with other serums; in the morning, always follow with broad-spectrum sunscreen, which is essential for any brightening or even-tone goal. Use it consistently over weeks for gradual results, and while it's well tolerated, patch test first if your skin is highly reactive, as with any new product.

Value Assessment

At around ten dollars, this is excellent value for a gentle, fragrance-free brightening serum, particularly for sensitive skin that struggles to tolerate stronger, pricier brighteners. The formula is simple, but it's the right kind of simple — a well-chosen soothing brightener plus hydration, with nothing irritating padded in. You're paying for function rather than branding or packaging, and the single-concern format means you spend only on the concern you have. The honest caveat is that its mild effect means anyone needing serious pigment correction will eventually want a stronger (and likely more expensive) active, but as an affordable, low-risk daily even-tone step, it's hard to fault on value.

Who Should Buy

Consider it if you want a gentle, affordable, fragrance-free brightening serum that calms redness as it evens tone, and especially if your skin is sensitive or reactive and can't tolerate stronger brighteners. It suits nearly all skin types looking for mild, low-risk maintenance for dullness and minor unevenness.

Who Should Skip

Skip it if you need to fade stubborn dark spots, melasma, or significant hyperpigmentation, since licorice is too gentle for intensive correction — stronger actives or professional treatment are better. Those wanting fast, dramatic brightening will also find it too subtle.

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Details

Product Details

Texture

Lightweight gel-fluid that absorbs cleanly

Scent

Fragrance-free with a faint natural extract note

Packaging

Small bottle with dropper

Finish
fast-absorbinglightweightfresh
What to Expect on First Use

It feels soothing and lightly hydrating on application, with no fragrance to sting — a calm, unfussy serum. Brightening isn't instant; over several weeks of consistent use with sunscreen, dullness and minor unevenness gradually soften, while the licorice's soothing effect on redness can be felt sooner.

How Long It Lasts

About 2-3 months with daily use from the 30ml bottle

Period After Opening

12 months

Opened yours? Track the toss-by date
Best Season

All Year

Certifications
vegan
Background

The Story Behind This Product

Within It's Skin's mix-and-match Power 10 effector system, the LI (licorice) effector is the brightening-and-calming option, leaning on one of skincare's most reliable gentle brighteners. Its short, fragrance-free ingredient list reflects a deliberately minimal approach aimed at uneven, reactive skin.

About It's Skin Established Brand (5–20 years)

It's Skin's Power 10 effectors are an established, affordable line of single-concern Korean ampoules. The LI Effector is the licorice-based brightening member — and one of the gentlest in the range, with a notably short, fragrance-free formula centered on a well-regarded soothing brightener.

Brand founded: 2006 · Product launched: 2010
Myth vs. Reality

Common Myths

Myth

A gentle licorice serum will erase dark spots like a strong brightening treatment.

Reality

Licorice is a mild, gradual brightener — it helps fade dullness and minor unevenness and soothes redness over weeks, but it won't erase stubborn dark spots the way higher-strength actives (or professional treatments) can. Paired with daily sunscreen, it's a gentle maintenance brightener, not an intensive pigment corrector.

FAQ

Frequently Asked Questions

What does the It's Skin LI Effector do?

It's a gentle brightening-and-soothing serum built around licorice root extract, which helps fade dullness and minor unevenness while calming redness. Polyglutamic acid adds hydration. It's one of the mildest, fragrance-free options in the Power 10 line, suited to uneven or reactive skin.

Is it gentle enough for sensitive skin?

Yes — unusually so. The formula is short, fragrance-free, and alcohol-free, with licorice root as a soothing, anti-inflammatory active, making it one of the few brightening serums that even sensitive and redness-prone skin can typically use comfortably. Patch testing is still wise with any new product.

Will it fade my dark spots?

Gradually and mildly. Licorice is a gentle brightener that helps even tone and soften dullness over weeks, but it won't erase stubborn dark spots the way stronger actives can. Use it consistently with daily sunscreen and view it as gentle maintenance rather than intensive correction.

How does it compare to vitamin C for brightening?

It's gentler and better tolerated than high-strength vitamin C, but also milder in effect. Licorice soothes as it brightens, which suits reactive skin, whereas vitamin C is more potent but more likely to irritate. Some people layer both; sensitive skin may prefer licorice alone.

Is it good value?

Very — it's an affordable, gentle, fragrance-free brightening serum that suits nearly all skin types. For the price, it's a low-risk way to add soothing, even-tone support to a routine, especially for sensitive skin that struggles with stronger brighteners.

Reviews

What Reviewers Tend to Say

Recurring themes our editors read across retailer reviews of this product — summaries in our words, not quotations, and not a substitute for your own patch test.

Common Praise

Gentle and soothing, even on sensitive skin

Helps calm redness

Affordable brightening option

Lightweight and hydrating

Common Complaints

Brightening is gradual and subtle

Simple formula, single active

Not a strong pigment treatment

Results need consistency and sunscreen

Notable Endorsements
Gentle, fragrance-free K-beauty brightening ampoule
Related Conditions
dullnesshyperpigmentationsensitivity
Related Ingredients
licorice rootpolyglutamic acidglycerin