Retinol serum for dull skin is a skincare product designed to accelerate cell turnover and boost collagen, aiming to remove dead skin cells and promote the growth of new, healthy skin to improve radiance, texture, and tone. A “60 ml” serum refers to the volume of the product, which is often a larger, more cost-effective size compared to the standard 30 ml bottles, making it suitable for consistent, long-term use on the face and neck. 
These serums are specially formulated for dullness, often incorporating additional hydrating and brightening ingredients to balance the potency of retinol. 

Key Benefits of Retinol Serum for Dull Skin
Improves Radiance: By speeding up cell turnover, these serums shed dead skin cells, helping to reduce dullness and boost radiance.
Reduces Fine Lines & Wrinkles: Stimulates collagen production to smooth texture and improve skin firmness.
Fades Dark Spots: Helps lighten hyperpigmentation, acne marks, and sun spots.
Improves Texture: Smooths rough skin and evens out the complexion.
Minimizes Pores: Regulates oil production and keeps pores clear. 

Commonly Paired Ingredients
To combat the potential dryness caused by retinol, “dull skin” formulas often include hydrating and calming actives: 
Hyaluronic Acid: Provides intense hydration and plumps the skin.
Niacinamide: Calms the skin, reduces irritation, and brightens tone.
Squalane: A moisturizing agent that nourishes the skin barrier.
Vitamin C/Glutathione: Brightening agents that work with retinol to fight pigmentation. 

Top Examples of Retinol Serums for Dull Skin
The Body Temple Face Serum (30ml-60ml options): Contains 0.6% retinol, vitamin C, and glutathione for brightening and anti-aging.
Pearl Essential Retinol Serum (60ml): Formulated with retinol, hyaluronic acid, and glutathione to improve texture and enhance radiance.
Proven Honest Derma 0.3% Retinol Serum (60ml): Features retinol, bakuchiol, and peptides to address dullness and improve elasticity.
Olay Regenerist Retinol 24 Night Serum (Usually 30ml, but often in 60ml bundles): Combines niacinamide and retinol for overnight skin transformation. 

How to Use
PM Only: Apply only in the evening, as retinol makes skin sensitive to sunlight.
Start Slow: Use 2–3 times a week initially, gradually increasing as skin adapts.
Apply to Dry Skin: Apply a small amount to a clean, dry face.
Moisturize: Follow with a hydrating moisturizer to prevent dryness.
Sunscreen: Use broad-spectrum SPF 30+ daily, as retinol increases sun sensitivity.