What concentration should I start with?

Most patients do well starting with 10% L-ascorbic acid. Sensitive skin types may prefer 5%, while experienced vitamin C users can often tolerate 15-20%. Our SkinIQ analysis helps determine the ideal starting concentration for your skin.

Can I use this with retinoids?

Yes, but use them at different times. Apply vitamin C in the morning for antioxidant protection, and retinoids at night. This prevents potential irritation and maximizes the benefits of both ingredients.

Why does my serum sometimes look yellow or brown?

L-ascorbic acid can oxidize when exposed to light and air, causing color changes. While slightly yellow serum is still effective, brown or dark orange indicates significant oxidation and reduced potency. Store properly and replace as needed.

How long until I see results?

Most patients notice improved skin radiance within 2-3 weeks. Significant improvements in dark spots and overall skin tone typically appear after 6-8 weeks of consistent daily use, with continued improvement over 3-4 months.

P Serum + L-Ascorbic Acid (LAA) — Universkin

Name: P Serum + L-Ascorbic Acid (LAA)
Brand: Universkin
Availability: OutOfStock

P Serum + L-Ascorbic Acid (LAA)

Pure vitamin C for radiant, protected skin

Clinical-strength L-ascorbic acid serum for brightening and antioxidant protection.

NewNot stocked in clinic

Listed here as part of the Universkin line for reference. We do not stock it in Westfield or Carmel — ask your provider what we carry for the same concern.

About P Serum + L-Ascorbic Acid (LAA)

Universkin P Serum + L-Ascorbic Acid delivers the most potent and bioavailable form of vitamin C in a customizable concentration tailored to your skin's tolerance. This pharmaceutical-grade formula contains pure L-ascorbic acid, the gold standard antioxidant that neutralizes free radicals, stimulates collagen synthesis, and inhibits melanin production for a brighter, more even complexion. The advanced stabilization technology ensures maximum potency while minimizing irritation, making this suitable even for sensitive skin when properly introduced. Clinical studies show significant improvements in skin luminosity, reduction of dark spots, and enhanced skin texture within 4-6 weeks of consistent use. The lightweight, fast-absorbing formula layers beautifully under sunscreen and makeup. Ideal for those seeking to address dullness, uneven skin tone, fine lines, and environmental damage. Available in multiple concentrations (5%, 10%, 15%, 20%) to accommodate different skin types and experience levels with vitamin C.

Key Ingredients

L-Ascorbic AcidStabilizing ComplexAntioxidant BoosterspH Balancers

How to Use

Apply 3-4 drops to clean, dry skin every morning after cleansing and toning. Start with every other day for the first week to build tolerance, then progress to daily use. Always follow with broad-spectrum sunscreen SPF 30 or higher. Can be layered under moisturizer and makeup. Store in a cool, dry place away from light.

Pro Tip from Our Clinicians

Start with a lower concentration if you're new to vitamin C, then gradually increase as your skin builds tolerance. Pairs exceptionally well with our IPL photofacials and chemical peels to accelerate brightening results and maintain luminosity between treatments.

Best For Skin Types

normalcombinationoilysensitive

Targets

dullnessdark spotsfine linestexturepost inflammatory

Pairs Well With

ipl peels skiniq

Frequently Asked Questions

← Universkin All Brands