Skinfix Brighten + Firm Vitamin C Serum 15% THD – 1 oz, Peptides & Hydrators for Sensitive, Aging Skin

Skinfix Brighten + Firm 15% Vitamin C Serum is a lightweight, clinically backed daily serum that blends 15% THD vitamin C with peptides to brighten skin tone and improve firmness without irritating sensitive skin.

This serum is formulated to target uneven pigmentation, dullness, and early signs of aging using a stable, oil-soluble vitamin C derivative plus peptide complexes and hydrating humectants. Designed for everyday use morning and night, the formula prioritizes potency and skin tolerability by avoiding common irritants like fragrance and essential oils. Clinical testing reported high user satisfaction for brighter-looking skin and improved lines when used consistently.

How quickly will I notice changes in dark spots and radiance?

Many users report visible improvement within weeks; the formula combines 15% tetrahexyldecyl ascorbate (THD vitamin C) with targeted peptides to promote a brighter complexion. Results depend on baseline concerns and consistency of use.

• 15% THD vitamin C for stable, long-lasting brightening.
• 2% tetrapeptide solution targets hyperpigmentation.
• Clinical testing showed high rates of perceived radiance improvement.
• Best results when used twice daily and paired with sunscreen in the morning.

Will this serum irritate sensitive or reactive skin?

The formulation is fragrance-free and omits essential oils, silicones, phthalates, parabens, sulfates, PEGs, microplastics and gluten to reduce common triggers. Clinical participants, including those with sensitive skin, reported the product was gentle even with twice-daily use.

• 15% THD vitamin C is an oil-soluble derivative known for greater stability and lower irritation than some ascorbic acids.
• Gentle peptide complexes instead of harsh actives that can cause redness.
• Free of fragrance and several common irritants for improved tolerability.
• Patch test if you have highly reactive or compromised skin barrier.

How should I include this serum in my skincare routine?

Use 1–2 pumps on clean, dry skin after cleansing and before moisturizing. It is suitable for morning and evening; in daytime routines follow with broad-spectrum sunscreen for protection and to complement brightening benefits.

• Apply to face and neck after cleansing, before moisturizer.
• Safe for twice-daily use—start once daily if you prefer to build tolerance.
• Pair with SPF in the morning to protect results and prevent further pigmentation.
• Layer with gentle hydrators; avoid immediately pairing with strong exfoliants if your skin is sensitive.

What active ingredients are inside and what do they do?

The serum combines multiple actives to address brightness, texture and hydration without heavy formulations. Each ingredient is selected to support visible improvement and daily wearability.

• 15% Tetrahexyldecyl Ascorbate (THD Vitamin C): brightens and helps even skin tone.
• 2% Tetrapeptide Solution: targets dark spots and hyperpigmentation.
• 2% PGA Peptide Solution: restores bounce and improves surface texture.
• 5% Glycerin and 1% antioxidant blend with ferulic acid for hydration and potency support.

Who is this for: Skinfix Brighten + Firm 15% Vitamin C Serum is aimed at people seeking a potent but gentle brightening serum — ideal for those with uneven tone, early fine lines, or dull skin who prefer formulas free of fragrance and common irritants. It works for sensitive and aging skin types when used as directed; those with specific medical skin conditions should consult a dermatologist first.