AHA BHA PHA 30 Days Miracle Serum
K-Beauty Glow Serum
Verified reviewer
Pros & cons.
- +Disclosed 14.51% centella asiatica extract provides genuine soothing and anti-inflammatory benefits
- +Nourishing oil-serum base with rosehip, camellia, and rice bran oils softens and conditions skin
- +Tea tree water at 1% adds mild antimicrobial support for acne-prone skin
- +Niacinamide contributes brightening and barrier-strengthening effects
- +Rich botanical extract list includes genuinely interesting actives like baicalin and resveratrol sources
- +Reasonable price at $20 for a multi-botanical serum with disclosed active concentrations
- −AHA/BHA/PHA concentrations are negligible (parts per billion) — misleading for consumers expecting exfoliation
- −Contains alcohol which can irritate and compromise the barrier centella is trying to repair
- −Multiple essential and citrus oils add fragrance but increase sensitization risk
- −Olive oil and almond oil are moderately comedogenic for acne-prone skin
- −Oil-rich texture may feel too heavy or dewy for oily skin types
The full review.
Let’s address the elephant in the dropper bottle. Some By Mi’s Miracle Serum lists six AHAs, a BHA source, and a PHA. It specifies the concentrations: glycolic acid at 3000ppb, lactic acid at 3000ppb, malic acid at 3000ppb, citric acid at 7500ppb, and lactobionic acid at 100ppm. These numbers use parts per billion instead of percentages for a reason. 3000ppb is 0.0003%. Effective glycolic acid products typically contain 5-30%. This gap is a canyon, not a rounding error.
This matters because the 30 Days Miracle line markets a triple-acid premise, and this serum uses the same AHA-BHA-PHA branding on its packaging. A consumer sees three exfoliating acids and expects an exfoliating serum. They actually get a centella oil-serum with trace acids that act as pH adjusters, not exfoliants.
The twist: once you adjust your expectations, this is a decent product for what it is.
About Some By Mi’s Miracle Serum
The formula’s strength is its 14.51% centella asiatica content. This is a meaningful concentration for a soothing botanical, and centella’s anti-inflammatory properties are well-documented. Combined with tea tree leaf water at 10,000ppm (1%), niacinamide, licorice root extract, and chamomile extract, this serum has a legitimate soothing profile. If you have irritated, post-breakout skin that needs comforting rather than exfoliating, the centella and botanical blend helps.
Texture
The base is an oil-serum format—caprylic/capric triglyceride and cetyl ethylhexanoate lead the list, followed by olive oil. This creates a lightweight, golden-tinted slip that absorbs to a dewy finish. It feels nourishing without being heavy, though oily skin types may find the oil base adds more dewiness than they want. Rosehip oil, rice bran oil, and camellia seed oil add to the emollient profile, making the product good at softening and conditioning skin.
Formula
The botanical extract list is extensive: Scutellaria baicalensis (baicalin) for antioxidant protection, polygonum cuspidatum (a resveratrol source), and houttuynia cordata, an East Asian medicinal herb with anti-inflammatory properties. These are not filler ingredients; they reflect a K-beauty philosophy of layered botanical synergy.
Common Complaints
The formula has drawbacks beyond the misleading acid claims. Alcohol is in the middle of the ingredient list—not at a high concentration, but enough to potentially irritate and disrupt the barrier, which contradicts the use of centella for barrier support. Multiple essential oils (grapefruit peel, orange peel, geranium, frankincense) add fragrance and sensitization risk. For a serum for problem skin, the fragrance load is high.
The comedogenic potential is also a concern. Olive oil and almond oil both have moderate comedogenic ratings; using them in a serum for acne-prone skin is a questionable choice. Some users will tolerate them, but others may experience new congestion.
Scent
The texture is pleasant. The dropper dispenses a golden, slightly viscous liquid that warms between fingertips and spreads into a thin, glowy layer. The herbal-citrus scent is noticeable—it feels spa-like if you enjoy botanical fragrances, but it is too much if you prefer unscented products. Absorption takes two to three minutes, and the finish is dewy. Under a final moisturizer, it creates a nourishing nighttime layer that leaves skin looking plump and calm by morning.
Price
At around $20 for 50ml, the price is reasonable for a centella-focused oil-serum with a dense botanical list. You get real centella content, tea tree water, niacinamide, and a nourishing oil base. The value is there, just not the value the packaging advertises.
The Honest Recommendation
The honest recommendation: treat this as a soothing, nourishing centella serum and it delivers. Treat it as an exfoliating triple-acid treatment and you will be disappointed. The gap between those two products is marketing, not quality. If you use the Miracle toner and cream (which contain more meaningful acid levels), this serum works as the calming, nourishing layer between them—a good role for a serum.
Ingredient analysis.
Full INCI list
Caprylic/Capric Triglyceride, Cetyl Ethylhexanoate, Centella Asiatica Extract, Purified Water, Olea Europaea Fruit Oil, Glycerin, Propanediol, Butylene Glycol, Alcohol, 1,2-Hexanediol, Melaleuca Alternifolia Leaf Water, Niacinamide, Camellia Sinensis Leaf Extract, Scutellaria Baicalensis Root Extract, Polygonum Cuspidatum Root Extract, Glycyrrhiza Glabra Root Extract, Chamomilla Recutita Flower Extract, Rosmarinus Officinalis Leaf Extract, Citric Acid, Sodium Lactate, Sodium PCA, Glycolic Acid, Lactic Acid, Malic Acid, Pyruvic Acid, Tartaric Acid, Gaultheria Procumbens Leaf Extract, Lactobionic Acid, Vaccinium Macrocarpon Fruit Extract, Lavandula Angustifolia Extract, Ocimum Basilicum Leaf Extract, Syringa Vulgaris Extract, Houttuynia Cordata Extract, Angelica Keiskei Extract, Althaea Officinalis Root Extract, Rosmarinus Officinalis Extract, Madecassoside, Camellia Oleifera Seed Oil, Oryza Sativa Bran Oil, Camellia Sinensis Seed Oil, Rosa Canina Fruit Oil, Prunus Amygdalus Dulcis Oil, Limnanthes Alba Seed Oil, Sodium Chloride, Curcuma Longa Root Extract, Citrus Paradisi Peel Oil, Citrus Aurantium Dulcis Peel Oil, Melia Azadirachta Leaf Extract, Melia Azadirachta Flower Extract, Melia Azadirachta Bark Extract, Pearl Powder, Xanthan Gum, Pentylene Glycol, Moringa Oleifera Seed Oil, Ocimum Sanctum Leaf Extract, Ocimum Basilicum Flower/Leaf Extract, Pelargonium Graveolens Flower Oil, Frankincense Oil, Amyris Balsamifera Bark Oil, Disodium EDTA, Caprylyl Glycol, Ethylhexylglycerin
Skin match.
The science.
The Science
The centella asiatica content is the serum's most scientifically defensible claim. At 14.51%, the centella extract concentration is high enough to improve skin via anti-inflammatory and barrier-supporting properties. Research shows centella's key triterpenes — asiaticoside, madecassoside, asiatic acid, and madecassic acid — promote collagen synthesis, inhibit inflammatory mediators, and accelerate wound healing.
The multi-AHA blend requires scrutiny. Effective alpha hydroxy acid exfoliation usually needs 5-15% concentrations at a pH of 3-4. This serum's glycolic acid at 3000ppb (0.0003%) is 17,000 to 50,000 times below the threshold for clinically meaningful exfoliation. At these levels, the acids act as buffering agents and minor humectants instead of exfoliants.
Tea tree (Melaleuca alternifolia) at 10,000ppm (1%) is below the 5% concentration typically studied for antimicrobial efficacy against Cutibacterium acnes. Some evidence suggests lower concentrations provide mild antibacterial activity with consistent use, but the effect is modest compared to therapeutic-strength tea tree formulations.
Niacinamide concentration is undisclosed, but 2-5% has a robust evidence base for sebum reduction, barrier strengthening, and anti-inflammatory effects. Its presence adds a well-supported active to the formula's soothing profile.
Dermatologist Perspective
Dermatologists would note a disconnect between this serum's marketing and its formulation. Board-certified dermatologists emphasize that the AHA/BHA/PHA concentrations are orders of magnitude below therapeutic levels, making the triple-acid claims misleading clinically. However, the 14.51% centella asiatica content is a meaningful concentration for anti-inflammatory and barrier-support purposes. Dermatologists commonly recommend centella-based products for irritated skin and post-procedure recovery. The alcohol and multiple essential oils would concern dermatologists treating sensitive or reactive skin, as these ingredients can undermine the centella complex's soothing benefits.
Where it fits in your routine.
Apply 2-3 drops to clean fingertips after toning. Press gently into the face and neck, but avoid the eye area. Use this in the evening because the texture is oily. Wait 2-3 minutes for absorption before you apply moisturizer. If using the full 30 Days Miracle line, apply after the toner and before the cream. Use every-other-night for the first week to check if your skin tolerates the botanical blend and essential oils.
At about $20 for 50ml, this serum has fair value as a centella oil-serum, but not as an exfoliating treatment. The 14.51% centella content, tea tree water, niacinamide, and various botanical oils justify the price. However, if you buy this for acid exfoliation (as the packaging suggests), the value collapses—you pay $20 for acids at homeopathic concentrations. The price is reasonable if you know what you are buying.
This serum suits combination and normal skin types that want a soothing, nourishing treatment with centella. It works as a calming step in an active routine or for post-breakout skin that needs comfort instead of more exfoliation.
Skip this if you want an exfoliating acid serum; the acid concentrations are negligible. Those with fungal acne should avoid the oil-heavy base. Sensitive skin types and anyone reactive to essential oils or citrus should also skip it, as grapefruit, orange, geranium, and frankincense oils provide a substantial fragrance load.
Product details.
Lightweight oil-serum has a slightly viscous, golden-tinted texture that leaves a dewy finish
Grapefruit, orange, geranium, and frankincense essential oils create a noticeable herbal and citrus fragrance.
Green-and-white dropper bottle with the 30 Days Miracle line branding
It applies with an oily slip and mild herbal scent. The oil-serum texture absorbs in minutes but leaves a dewy residue. It has no significant tingling or acid sensation, matching the trace-level acid concentrations. Most users like the texture; those expecting acid-level exfoliation from the name may find the mild, oil-forward experience surprising.
2-3 months with nightly use (2-3 drops per application)
12 months
fall winter
The backstory.
Launched as part of the original 30 Days Miracle line around 2018, the serum was designed to be the treatment step between the toner and cream. While the line's other products deliver more meaningful acid concentrations, this serum pivots toward soothing and nourishing — a choice that makes sense given that users applying the toner and cream are likely getting sufficient acid exposure from those steps.
About Some By Mi
Some By Mi launched in South Korea in 2016 and exports to over 20 countries. The 30 Days Miracle line uses the proprietary Truecica formula and has thousands of global reviews, though it relies on consumer validation rather than peer-reviewed clinical research.
FAQ.
Is this serum good for oily skin?
The oil-rich base (caprylic/capric triglyceride, olive oil, multiple seed oils) feels heavy on very oily skin. Combination skin and normal skin types that lean oily tolerate it better, especially at night. If you have oily skin and want lightweight textures, the Miracle Toner is a better choice from this line.
Can I use this serum with other acids?
Yes — because this serum has negligible acid concentrations, combining it with other acid products does not risk over-exfoliation. The main factor is if the oil-rich base layers with your other serums. Apply water-based treatments first, then this oil-serum on top.
Why does this serum contain alcohol?
Alcohol (denatured alcohol) acts as a solvent to dissolve and stabilize the botanical extracts and essential oils in the formula. It improves texture and absorption but causes dryness and irritation for sensitive skin. Its mid-list placement shows a moderate concentration.
Is the Some By Mi Miracle Serum safe during pregnancy?
Talk to your healthcare provider. The acid concentrations are negligible, but the serum contains essential oils (citrus, geranium, frankincense) that some practitioners advise avoiding during pregnancy. The salicylic acid source (wintergreen extract) is also at trace levels and warrants discussion with your doctor.
What the community says.
"Gives skin a healthy, dewy glow"
"Centella content helps calm irritated skin"
"Pleasant herbal scent for those who enjoy botanical fragrances"
"Good value for a multi-ingredient serum"
"Oily texture can feel heavy on oily skin"
"Acid concentrations are too low to provide real exfoliation"
"Contains alcohol which is counterproductive for acne-prone skin"
"Strong fragrance from essential oils bothers sensitive users"
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