M-Lac 15 Professional Mandelic Resurfacing Serum by Viriditas

Name: M-Lac 15 Professional Mandelic Resurfacing Serum by Viriditas
Brand: Viriditas
SKU: VA13
Price: 43.00 USD
Availability: InStock

$43.00 USD

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15% Mandelic Acid + Lactic Acid + Niacinamide

The most advanced strength in our M-Lac collection, created for resilient skin with established acid tolerance.

M-Lac 15% combines high-strength mandelic acid with lactic acid, niacinamide, hyaluronic acid, and calming botanicals to provide more intensive support for persistent visible congestion, rough texture, and post-breakout discoloration.

This is not the place to begin—and it is not a strength everyone needs. At-home use should be limited, deliberate, and professionally guided.

Why we chose it:

Some resilient complexions tolerate consistent exfoliation but continue to show stubborn congestion, pronounced texture, or persistent discoloration. M-Lac 15% offers a carefully chosen next step for those situations.

Mandelic acid’s larger molecular structure allows for more gradual penetration than some smaller alpha hydroxy acids, but a 15% concentration still deserves respect. Niacinamide, hyaluronic acid, licorice, and chamomile help create a more considered formula; they do not cancel the intensity of the exfoliating acids.

This serum belongs in an intentional treatment plan—not in a race toward the strongest product available.

Best suited for:

M-Lac 15% may be appropriate for:
- Resilient skin with established tolerance to M-Lac 10%
- Persistent visible congestion or thick, rough-feeling texture
- Very oily areas that tolerate exfoliating acids comfortably
- Post-breakout marks that remain after active blemishes have settled
- Congestion-prone areas of the back, chest, or shoulders
- Targeted rather than automatic full-face use
- Someone following professional home-care guidance

You may prefer another option if:

Choose M-Lac 5% if you are new to leave-on acids, returning after a break, or tend to become dry or reactive easily.

Choose M-Lac 10% if you already tolerate exfoliation but have not yet established comfortable, consistent use of a mid-strength mandelic serum.

M-Lac 15% is not recommended for dry, highly sensitive, visibly compromised, or actively irritated skin. Wait before use if the skin is sunburned, peeling, raw, or recovering from waxing, a peel, laser treatment, or another resurfacing service.

Choosing your M-Lac strength:

M-Lac 5% — Introductory
For someone new to mandelic acid, returning after a break, easily dehydrated by actives, or seeking gentle maintenance.

M-Lac 10% — Intermediate
For skin that comfortably tolerates 5% but still needs more support for persistent congestion, uneven texture, or post-breakout marks.

M-Lac 15% — Advanced
For resilient skin with established tolerance to 10% and a specific reason for more intensive exfoliation. Best used with professional guidance.

Fifteen percent is not the destination. The right strength is the lowest one that provides meaningful support while allowing the skin to remain comfortable and consistent.

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🌿 Laurie's Professional Guidance

M-Lac 15% is a specialist, not an overachiever.

I choose it when the skin is resilient, already comfortable with lower mandelic strengths, and still has a clear reason for needing more intensive exfoliation. I do not choose it simply because someone wants faster results.

Begin with one carefully placed evening each week. Use a thin layer and resist the urge to stack it with every other active product you own.

Skin improves through rhythm, recovery, and consistency. Fifteen percent should serve that process—not overpower it.

— Laurie Neronha, Licensed Esthetician & Acne Specialist

Pro Tips

This is strong stuff. Use only as directed by your esthetician.

Key Ingredients

15% mandelic acid
The highest mandelic-acid concentration in the M-Lac collection. It provides more intensive exfoliation to refine the appearance of persistent congestion, rough texture, uneven tone, and post-breakout discoloration.

Lactic acid
Complements mandelic acid by supporting surface renewal and smoother-looking texture.

Niacinamide
A form of vitamin B3 that supports a more even-looking complexion and helps maintain a balanced, resilient appearance.

Hyaluronic acid
A water-attracting humectant included to help the skin feel more comfortably hydrated.

Licorice root + chamomile
Botanical extracts chosen to support a calmer, brighter, and more even-looking complexion.

Full Ingredients

Ingredients: Deionized Water, SDA 40, Propylene Glycol, Mandelic Acid, Hydroxyethylcellulose, Sodium PCA, Glycerin, Hyaluronic Acid, Niacinamide, Sodium Benzoate, Lactic Acid, Citric Acid, Hydroxypropylcellulose, Panthenol, Licorice Root Extract, Chamomile Extract, Caprylyl Glycol, Ethylhexylglycerin, Essential Oil.

How to Use

For at-home use, apply only with professional guidance.

Begin one evening per week. Apply a thin, even layer to clean, completely dry skin, avoiding the eyes, lips, corners of the nose, and any raw or broken areas.

If your skin remains comfortable and your treatment plan calls for it, use may gradually increase to two or three evenings per week. More frequent use is not automatically better.

Follow with a suitable moisturizer and wear broad-spectrum sunscreen every morning.

Do not use benzoyl peroxide, retinoids, scrubs, or another exfoliating acid in the same application unless specifically directed.

Where It Fits in Your Ritual

Use in the evening:

Cleanse gently
Tone, if desired
Allow the skin to dry completely
Apply a thin layer of M-Lac 15% to the selected area
Follow with moisturizer as directed

Keep the rest of the evening ritual quiet and supportive. Do not follow it with another exfoliant, retinoid, medicated spot treatment, or abrasive tool.

Broad-spectrum sunscreen is essential every morning.

Botanicals in This Formula

Licorice Root (Glycyrrhiza glabra)

Licorice root is one of herbal skincare's most beloved botanicals for calming visible redness and supporting a more even-looking complexion. Rich in naturally occurring antioxidant compounds, it helps soothe skin that appears irritated or stressed while promoting a brighter, healthier-looking appearance. Its gentle nature makes it a favorite for sensitive, reactive, and post-breakout skin.

Best known for:

Soothing visible redness
Supporting a brighter-looking complexion
Antioxidant protection

Frequently Asked Questions

Is M-Lac 15% the most effective M-Lac strength?
It is the strongest, but strongest and most effective are not always the same. The most useful strength is the one your skin can tolerate consistently without repeated irritation.

Do I need to use M-Lac 5% and 10% first?
In most cases, yes. M-Lac 15% is intended for skin with established acid tolerance. Familiarity with a different exfoliant does not always predict how your skin will respond to this formula.

How often should I use it?
Begin once weekly. Increase only when your skin remains comfortable and your treatment plan calls for greater frequency. At-home use is generally limited to one to three evenings per week unless directed otherwise.

Can I use it every night?
Nightly use is not the intended starting point and may be unnecessary even for resilient skin. More frequent exfoliation can create inflammation and undermine the results you are trying to achieve.

Can I apply it only to certain areas?
Yes. Targeted use may be appropriate for resilient areas with persistent congestion or rough texture. Avoid automatically applying it to delicate or comfortably clear areas.

Can I use it on my back, chest, or shoulders?
It may be used on resilient, congestion-prone body areas with professional guidance. Begin slowly, especially where clothing may create friction after application.

Can I combine it with benzoyl peroxide?
Both may fit within the same overall acne ritual, but do not layer them in the same application unless Laurie has specifically directed you to do so. Alternating days or separating treatments is usually more comfortable.

Can I use it with retinol?
Do not introduce or layer M-Lac 15% with retinol without individualized guidance. Combining high-strength exfoliation with a retinoid can increase irritation significantly.

What if it tingles?
A mild, brief tingle may occur. Persistent burning, pronounced heat, swelling, rawness, or prolonged redness is not something to push through.

Will it make my skin peel?
Visible peeling is not required for the serum to be effective. If peeling becomes significant or uncomfortable, pause use and focus on barrier support.

Can sensitive or dry skin use it?
This is generally not the appropriate M-Lac strength for sensitive, dry, or easily compromised skin. M-Lac 5% or another gentler ritual will usually be the more thoughtful choice.

Can I use it after extractions?
Only when directed by a trained professional. Do not apply it to raw, open, or freshly disturbed skin at home.

Do I need sunscreen?
Yes. Daily broad-spectrum sunscreen is essential while using exfoliating acids and when working to improve the appearance of post-breakout discoloration.

Precautions

Mild, brief tingling may occur. Persistent burning, swelling, rawness, or prolonged redness is a reason to rinse, discontinue use, and allow the skin to recover.

Avoid the eyes, mouth, corners of the nose, and broken or freshly exfoliated skin. Keep out of reach of children.

Do not apply immediately before or after waxing, extractions, peels, laser treatments, or other resurfacing procedures unless directed by your skincare professional.

This formula contains an aromatic essential-oil ingredient that has not yet been fully identified in the manufacturer’s public ingredient information. Patch testing is particularly important for reactive skin.

Use broad-spectrum sunscreen every morning. For external use only.

Acne Safe

Paraben Free

Sulfate Free