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C4 Retinol Serum
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Good for :
  • Maintains healthy cell turnover, slowing the natural aging process
  • Protects against environmental damage while supporting skin’s barrier function.
  • Nourishes skin through antioxidant-rich hydration and regenerative peptides.
  • Brightens and evens skin tone while effectively reducing dark spots.
  • Regulates melanosome distribution to prevent hyperpigmentation from surfacing.
  • Firms and tightens skin texture, renewing lackluster, fatigued skin and slowing the natural aging process. 
  • Refines fine lines and wrinkles while encouraging healthy collagen production.
  • Brightens skin while reducing the signs of age spots and environmental damage.
  • Calms skin and reduces redness, irritation, and inflammation.
  • Restores skin’s natural barrier activity, retaining natural hydration.
Review Highlights
5.0
Rated 5.0 out of 5 stars
6 Reviews

C4 Retinol Serum

C4 Retinol Serum

Rejuvenate skin with Vitamin C and Retinol serum. Contains 4 forms of Vitamin C, reduces fine lines, wrinkles, and acne. Key Ingredients: Retinol, Vitamin C, Swiss Apple, Alpine Rose, Sea Fennel, Licorice Extract, Olive Leaf Extract.

star
5.0
Rated 5.0 out of 5 stars
6 Reviews
Innovative Ingredients:
  • Peptide Tech Peptide Tech
  • Vitamin C Vitamin C

MADE IN USA

CRUELTY-FREE

ECO-FRIENDLY PACKAGING

How to Use

Apply 1–2 pumps to cleansed skin in the evening. Follow with a Lira Clinical® crème or oil. Can be used up to twice daily depending on skin condition severity. Not to be used on the eye area.

Ingredients
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Science Ingredients

Ascorbate (BV-OSC), Ascorbyl Palmitate, Ascorbic Acid, Citric Acid:
Keratolytic agent, antioxidant, anti-inflammatory

1% Retinol:
Keratolytic agent, skin rejuvenation

Swiss Apple Plant Stem Cells:
Repairs and restores traumatized skin

Sea Fennel Plant Stem Cells:
Organic brightener

Alpine Rose Plant Stem Cells:
Adapts skin to harsh climates

Edelweiss Plant Stem Cells:
Stimulates healthy fibroblast activity

Hyaluronic Acid:
Natural humectant

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Nature Ingredients

Licorice Extract:
Anti-inflammatory, antioxidant, brightening

Olive Leaf Extract:
Anti-inflammatory, strengthens skin immunity, encourages skin hydration

Beet Root Extract:
Anti-inflammatory, soothing

Green Tea Extract:
Powerful antioxidant, inhibits melanosome transfer

Full Ingredients
Good for :
  • Maintains healthy cell turnover, slowing the natural aging process
  • Protects against environmental damage while supporting skin’s barrier function.
  • Nourishes skin through antioxidant-rich hydration and regenerative peptides.
  • Brightens and evens skin tone while effectively reducing dark spots.
  • Regulates melanosome distribution to prevent hyperpigmentation from surfacing.
  • Firms and tightens skin texture, renewing lackluster, fatigued skin and slowing the natural aging process. 
  • Refines fine lines and wrinkles while encouraging healthy collagen production.
  • Brightens skin while reducing the signs of age spots and environmental damage.
  • Calms skin and reduces redness, irritation, and inflammation.
  • Restores skin’s natural barrier activity, retaining natural hydration.
Review Highlights
5.0
Rated 5.0 out of 5 stars
6 Reviews
View full details
Water (Aqua), Tetrahexyldecyl Ascorbate, Glycerin, Dimethicone, Cetearyl Olivate, Sorbitan Olivate, Sodium Hyaluronate Crosspolymer, Cetyl Palmitate, Sorbitan Palmitate, Malus Domestica Fruit Cell Culture, Lecithin, Imperata Cylindrica Root Extract, Phenoxyethanol, Caprylyl Glycol,Ethylhexylglycerin, Hexylene Glycol, Butylene Glycol, Yeast Polysaccharides, PPG-12/SMDI Copolymer, Cetearyl Alcohol, Retinol, Polysorbate 20, Camellia Sinensis Leaf Extract, Beta Vulgaris (Beet) Root Extract, Haberlea Rhodopensis Leaf Extract, Yeast Extract, Tocopherol, Ascorbyl Palmitate, Ascorbic Acid, Citric Acid, Xanthan Gum, Dipotassium Glycyrrhizate, Tocopheryl Acetate, Crithmum Maritimum Callus Culture Filtrate, Leontopodium Alpinum Meristem Cell Culture, Rhododendron Ferrugineum Leaf Cell Culture Extract, Isomalt, Lactic Acid, Disodium EDTA, Aloe Barbadensis Leaf Juice Powder, Ubiquinone, Olea Europaea (Olive) Leaf Extract, Citrus Aurantium Dulcis (Orange) Peel Oil.

Customer Reviews

5.0
Rated 5.0 out of 5 stars
Based on 6 reviews
Total 5 star reviews: 6 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
100%would recommend this product
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6 reviews
  • MB
    Mikaela B.
    Flag of United States
    I recommend this product
    Rated 5 out of 5 stars
    8 months ago
    Magic in a bottle!

    This product has been INCREDIBLE. I was really noticing uneven tone, small patches of acne, and my fine lines becoming more pronounced. I was just overall frustrated by the look and texture of my skin. My esti recommended this product and after almost two weeks of use, I notice a huge difference! After three days of use there was noticeable smoothness, I no longe have any active breakouts, and my skin looks even in tone. Cannot recommend this product highly enough.

  • MG
    Marian G.
    Flag of United States
    I recommend this product
    Rated 5 out of 5 stars
    11 months ago
    The best Retinol serum

    This products gives and maintains amazing results. It also less irritating than other retinol serums I’ve encountered.

  • PH
    Patty H.
    Flag of United States
    I recommend this product
    Rated 5 out of 5 stars
    1 year ago
    Loved it

    Good it’s working

  • JM
    Jessica M.
    Flag of United States
    I recommend this product
    Rated 5 out of 5 stars
    1 year ago
    Love this retinol!

    I am obsessed with this retinol. It is effective and gentle at the same time and does wonders for congested/textured skin AND hormonal breakouts. Love it!

  • BK
    Blake K.
    Flag of United States
    I recommend this product
    Rated 5 out of 5 stars
    1 year ago
    Gentle yet Effective

    This by far the best retinol serum on the market. I have 99% of clients on this when they want brightening, age management and a simple routine. I have been using this since January and my skin tone has changed drastically and the texture is smoother.

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