Lat. Hydration · Long. BarrierIndependent skincare field guide — 204 products mapped · updated October 2026
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Serumsby Drunk Elephant

Drunk Elephant C-Firma Day Serum

Drunk Elephant's C-Firma Day Serum is a potent, well-formulated vitamin C treatment that delivers visible brightening and firming results for most skin types, though its premium price, fast oxidation, and potential for sensitivity mean…

4.3
Dewy Atlas score4.3 / 5
  • Results4.0
  • Gentleness4.7
  • Texture4.2
  • Value4.3
  • Brightens skin tone
  • Improves firmness
  • Antioxidant protection
Skin type
Normal, combination, oily
Texture
Lightweight gel-oil hybrid
Size
30 mL / 1.0 fl oz
Key ingredient
15% L-ascorbic acid
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Overview

What it is & who it suits

Drunk Elephant C-Firma Day Serum is a potent vitamin C treatment designed to brighten, firm, and protect the skin against the visible signs of aging and environmental stress. Formulated with 15% L-ascorbic acid, this serum works alongside a blend of supportive antioxidants including ferulic acid and vitamin E to enhance stability and maximize efficacy. The lightweight, fast-absorbing texture makes it easy to incorporate into a morning skincare routine, where it can help shield skin from free radical damage caused by UV exposure and pollution throughout the day.

Beyond its antioxidant properties, this serum is formulated to address uneven skin tone, dullness, and the appearance of fine lines and wrinkles. Pumpkin ferment and pansy extract are included to support gentle exfoliation and improve overall skin texture, while bioferment ingredients help maintain hydration and reinforce the skin barrier. The result is a complexion that appears more radiant, smooth, and resilient over time, as consistent use helps visibly firm the skin and restore a healthier-looking glow.

True to the Drunk Elephant philosophy, this serum is free from essential oils, silicones, and other ingredients the brand considers unnecessary or potentially irritating, making it suitable for those seeking a clean, straightforward approach to vitamin C skincare. The clear, honey-toned formula comes housed in a sleek glass dropper bottle, allowing for precise application and easy layering with other products in a skincare regimen. Whether used daily or a few times a week, this serum has become a staple for those looking to combine brightening benefits with long-term skin firming support.

Key features

  • 15% L-ascorbic acid vitamin C complex
  • Contains ferulic acid and vitamin E for antioxidant boost
  • African cherry extract for firmness
  • Pumpkin ferment and pansy extract to brighten
  • Silicone-free, fragrance-free, paraben-free formula
  • Lightweight gel-oil hybrid texture

Specifications

The formula, by the numbers

Volume
30 mL / 1.0 fl oz
Key Ingredient
15% L-ascorbic acid
Skin Type
Normal, combination, oily
Texture
Lightweight gel-oil hybrid
Shelf Life
3-4 months after opening

Pros & cons

What we liked, what we didn’t

Pros

  • Noticeably brightens and evens skin tone over time
  • Firms and improves skin elasticity with regular use
  • Fast-absorbing, layers well under moisturizer and sunscreen
  • Clean, 'Suspicious 6'-free formulation
  • Antioxidant blend helps defend against environmental damage

Cons

  • High price point for the bottle size
  • Oxidizes quickly once opened, turning from clear to tan
  • Can cause tingling or irritation for sensitive skin
  • Strong citrus scent despite being 'fragrance-free'
  • Short shelf life after opening (store in fridge recommended)
4.3Our score

The verdict

Drunk Elephant's C-Firma Day Serum is a potent, well-formulated vitamin C treatment that delivers visible brightening and firming results for most skin types, though its premium price, fast oxidation, and potential for sensitivity mean it's best suited for those already comfortable with active-ingredient skincare routines.

Check price on Amazon

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