Cos De BAHA Retinol Face Serum 2.5% (0.135% Pure Retinol) 1 oz — Hyaluronic Acid & Niacinamide for Texture & Even Tone

Cos De BAHA Retinol 2.5% Solution is a nighttime facial serum combining a 0.135% pure retinol concentrate with hyaluronic acid, niacinamide and vitamin E to help refine skin texture and support a more even-looking tone.

This formula pairs a high-strength 2.5% retinol complex (containing 0.135% pure retinol) with hydrating and skin-supporting actives so you can introduce retinol benefits within a balanced, serum base. Designed for evening use, the serum is delivered in a 1 fl oz (30 ml) bottle and is suitable for gradual integration into a skincare routine: start slowly and increase as skin tolerance improves. Packaging may vary slightly due to labeling regulations, but the ingredients and concentration remain consistent.

How should I introduce this retinol serum into my routine?

Begin with 1–2 drops applied to clean, dry skin two to three times per week at night, then increase frequency as your skin adapts. Always follow with daytime SPF when using retinol products.

• Apply after cleansing and toning, before heavier creams.
• Pat gently—do not rub—until absorbed.
• First-time users: use 2–3 times weekly, then progress slowly.
• Wear broad-spectrum sunscreen each morning during use.

What key ingredients are in the serum and what do they do?

The serum combines a concentrated retinol complex with supportive hydrators and skin-tone helping ingredients to create a balanced formulation that focuses on texture and radiance. Each component contributes a targeted role without requiring a prescription.

• Retinol 0.135% (within a 2.5% complex): concentrated retinol powder in a formulation base.
• Hyaluronic acid: attracts and holds moisture to help skin feel hydrated.
• Niacinamide: supports even-looking skin tone and overall skin appearance.
• Vitamin E: helps soften and protect the skin surface.

Is this serum suitable for sensitive or new retinol users?

The product is formulated to be gradual in strength but still considered a higher-strength option; newcomers should proceed with caution and reduce frequency if irritation occurs. Patch testing is recommended before full-face use.

• Start slowly: 2–3 nights per week, then increase as tolerated.
• Avoid eye area and mucous membranes; discontinue if irritation appears.
• Consult a physician before use if pregnant or nursing.
• Use a moisturizer and daytime sunscreen to protect skin barrier.

How will packaging or labeling affect what I receive?

Regulatory changes have updated how some botanicals and bases are listed on product labels; formulations remain the same even if ingredient presentation differs. The serum itself contains the active ingredients listed in product information.

• Labels may list botanical-derived bases as 'Water' rather than naming the extract.
• For products with aloe, the extract remains but label wording may vary.
• Ingredient concentrations and product size (1 fl oz / 30 ml) are consistent.

Who is this for: This Cos De BAHA Retinol 2.5% Solution is intended for adults seeking a stronger over-the-counter retinol option to support improved skin texture, a more even-looking tone, and added hydration. It's best suited to people comfortable building retinol tolerance into their evening routine, those who already use actives or are ready to introduce them gradually, and anyone who will commit to daytime sun protection and following usage precautions. If you have highly reactive skin or are pregnant/nursing, consult a healthcare professional before use.

Ingredients

*Aloe Barbadensis Leaf Extract, Propanediol, Retinol, Sodium Hyaluronate, Niacinamide, 1,2-Hexanediol, Polysorbate 20, Tocopheryl Acetate (Vitamin E), *Rosa Damascena Extract,*Lavandula Angustifolia Flower Extract,*Camellia Sinensis Leaf Extract, *Melissa Officinalis Leaf Extract,*Artemisia Vulgaris Extract, Disodium EDTA