Green Microalgae Retinol+ Regenerating Serum

Algenist

Green Microalgae Retinol+ Regenerating Serum

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About this product

The Algenist Green Microalgae Retinol+ Regenerating Serum is a serums, essence, ampoule. Our analysis of its 35 ingredients (25 low-risk) rates it Excellent (93/100). Based on its ingredients, it looks well-suited to oily / acne-prone and dry skin.

Vegan-friendly Reef-safe

Summarised from our ingredient analysis — not brand marketing copy.

At a glance

Type
Serums, Essence, Ampoules
Ingredients
35
Low-risk
25
Fragrance
Fragrance-free
Origin
United States
Data updated
May 2026

The evidence

Quick Product Notes

Paraben-Free Sulfate-Free Alcohol-Free Silicone-Free EU Allergen-Free Fungal Acne (Malassezia) Safe

Notable Effects & Ingredients

No Notable Effects & Ingredients

Ingredients Related to Skin Types

Good   Bad — tap a skin type to see which ingredients · estimated from ingredient functions
Dry Skin 8/6
Good for dry skin
Gluconolactone Cetyl Esters Undecane Caprylyl Glycol Sodium PCA Glycerin Lactic Acid Lecithin
Caution for dry skin
Xanthan Gum Glycerin Salicylic Acid Sodium Hydroxide Polysorbate 20 Lecithin
Oily/Acne-Prone Skin 2/0
Good for oily/acne-prone skin
Salicylic Acid Retinol
Sensitive Skin 4/7
Good for sensitive skin
Ethyl Ferulate Glycerin Hydroxyacetophenone Allantoin
Caution for sensitive skin
Gluconolactone Glycerin Tridecane Salicylic Acid Citric Acid Lactic Acid Retinol

Ingredients list

35 total
Lower hazard (1) Higher hazard (9)
All35 Skin Conditioning27 Fragrance9 Hair Conditioning7 Humectant7 Solvent6 Skin Protecting5 Buffering Agent4 Ph Adjuster4
EWG CIR Ingredient Name & Cosmetic Functions Notes
1
Water
(Solvent)
2
A
Glycerin
(Denaturant, Fragrance, Hair Conditioning, Humectant, Oral Care Agent, Oral Health Care Drug, Skin Protecting, Viscosity Decreasing Agent, Perfuming, Solvent)
Good for Dry Skin
Good for Dry Skin
Fungal Acne
Fungal Acne Trigger
1
B
Cetyl Esters
(Skin Conditioning, Emollient)
1
Chlorella Vulgaris Extract
(Skin Conditioning)
9
A
Retinol
(Skin Conditioning)
Bad for Sensitive Skin
Bad for Sensitive Skin
Parachlorella Beijerinckii Exopolysaccharides
(Film Forming, Skin Protecting)
4
B
Salicylic Acid
(Antiacne Agent, Antidandruff Agent, Corn/Callus/Wart Remover, Denaturant, Exfoliant, Fragrance, Hair Conditioning, Skin Conditioning, Keratolytic, Masking, Preservative)
Good for Oily Skin
Good for Oily Skin
Bad for Sensitive Skin
Bad for Sensitive Skin
4
B
Lactic Acid
(Exfoliant, Fragrance, Humectant, Ph Adjuster, Skin Conditioning Agent Humectant, Skin Conditioning, Buffering Agent)
Bad for Sensitive Skin
Bad for Sensitive Skin
4
B
Glycolic Acid
(Exfoliant, Ph Adjuster, Buffering Agent)
Good for Oily Skin
Good for Oily Skin
Bad for Sensitive Skin
Bad for Sensitive Skin
1
Phytic Acid
(Chelating Agent, Oral Care Agent)
1
Gluconolactone
(Fragrance, Humectant, Solvent)
TOCOPHEROL
(Antioxidant, Fragrance, Skin Conditioning)
1
A
Panthenol
(Antistatic Agent, Hair Conditioning, Skin Conditioning)
Good for Dry Skin
Good for Dry Skin
1
B
Sodium PCA
(Hair Conditioning, Humectant, Antistatic Agent, Skin Conditioning)
Good for Dry Skin
Good for Dry Skin
1
A
Allantoin
(Skin Conditioning, Skin Protecting, Soothing)
Good for Oily Skin
Good for Oily Skin
Good for Sensitive Skin
Good for Sensitive Skin
Bisabolol
(Fragrance, Skin Conditioning, Soothing)
Humulus Lupulus Extract
(Antimicrobial, Antiperspirant, Fragrance, Hair Conditioning, Skin Conditioning, Skin Protecting)
Helianthus Annuus Seed Oil
(Fragrance, Skin Conditioning, Skin Conditioning Emollient)
copernicia cerifera wax
(Depilatory)
2
3
Lecithin
(Skin Conditioning, Emulsifying, Surfactant, Antistatic Agent, Emollient)
1
A
Xanthan Gum
(Binding Agent, Emulsion Stabilising, Skin Conditioning, Surfactant Emulsifying Agent, Viscosity Increasing Agent, Binding, Gel Forming, Viscosity Controlling)
3
B
Polysorbate 20
(Emulsifying, Surfactant)
Fungal Acne
Fungal Acne Trigger
1
Polyacrylate Crosspolymer-6
(Emulsion Stabilising, Viscosity Controlling)
1
A
Disodium Cocoamphodiacetate
(Hair Conditioning, Sufactant, Foam Boosting, Hydrotrope, Skin Conditioning)
2
A
Citric Acid
(Chelating Agent, Fragrance, Ph Adjuster, Buffering Agent, Masking)
Bad for Sensitive Skin
Bad for Sensitive Skin
1
Ethyl Ferulate
(Antioxidant, Preservative)
3
B
Sodium Hydroxide
(Denaturant, Ph Adjuster, Buffering Agent)
1
Hydroxyacetophenone
(Antioxidant)
1
A
1,2-Hexanediol
(Solvent)
1
A
Caprylyl Glycol
(Hair Conditioning, Skin Conditioning, Emollient, Humectant)
1
A
Ethylhexylglycerin
(Deodorant, Skin Conditioning)
1
A
Pentylene Glycol
(Skin Conditioning, Solvent)
1
Tridecane
(Perfuming)
1
Undecane
(Emollient, Skin Conditioning)
1
Propanediol
(Solvent, Viscosity Decreasing Agent, Viscosity Controlling)

My Ingredient Notes

No personal ingredient notes yet. Save ingredients to your profile to get good/bad alerts here.

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Key ingredients

Antioxidants
Shields skin from free radical damage.
AHA
Exfoliates skin for a brighter complexion.
BHA
Unclogs pores and reduces excess oil.
PHA
Gently exfoliates and hydrates with less irritation.
Retinoid
Visibly reduces the signs of aging.
Vitamin E
Protects skin and soothes irritation.
Exfoliators
Removes dead skin cells to smoothe texture.
Show all 7 key ingredients

Benefits

HydratingBoosts hydration and relieves dry, tight skin.
Barrier RepairStrengthen and restore your skin's natural barrier.
Scar HealingImproves the look of marks and scars.
BrighteningRestores radiance to dull, tired skin.
Anti-AgingSoftens lines and helps skin look youthful.
Reduces IrritationEases discomfort and supports skin resilience.
Good For Oily SkinBalances oil and helps reduce shine.
Reduces Large PoresMinimizes the look of enlarged pores.

Concerns

Not fungal acne (malassezia) safe
Retinol — higher EWG
May not suit sensitive skin

EWG flags hazard, not real-world risk — ratings don't account for how much of an ingredient a product contains. Treat these as things to research, not verdicts. How we score →

Ingredients explained

Water
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 Solvent
Cetyl Esters
Skin conditioning, Emollient
Low-hazard ingredient.Read moreShow less
EWG 1 CIR B Skin conditioningEmollient
Chlorella Vulgaris Extract
Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 Skin conditioning
Parachlorella Beijerinckii Exopolysaccharides
Film forming, Skin protecting
Limited public safety data.Read moreShow less
EWG N/A Film formingSkin protecting
Phytic Acid
Chelating agent, Oral care agent
Low-hazard ingredient.Read moreShow less
EWG 1 Chelating agentOral care agent
Gluconolactone
Fragrance, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 FragranceHumectantSolvent
TOCOPHEROL
Antioxidant, Fragrance
Limited public safety data.Read moreShow less
EWG N/A AntioxidantFragranceSkin conditioning
Bisabolol
Fragrance, Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A FragranceSkin conditioningSoothing
Humulus Lupulus Extract
Antimicrobial, Antiperspirant
Limited public safety data.Read moreShow less
EWG N/A AntimicrobialAntiperspirantFragranceHair conditioningSkin conditioningSkin protecting
Helianthus Annuus Seed Oil
Fragrance, Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A FragranceSkin conditioningSkin conditioning emollient
copernicia cerifera wax
Depilatory
Limited public safety data.Read moreShow less
EWG N/A Depilatory
Lecithin
Skin conditioning, Emulsifying
Low-to-moderate hazard.Read moreShow less
EWG 2–3 Skin conditioningEmulsifyingSurfactantAntistatic agentEmollient
Xanthan Gum
Binding agent, Emulsion stabilising
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Binding agentEmulsion stabilisingSkin conditioningSurfactant -emulsifying agentViscosity increasing agentBindingGel formingViscosity controlling
Polyacrylate Crosspolymer-6
Emulsion stabilising, Viscosity controlling
Low-hazard ingredient.Read moreShow less
EWG 1 Emulsion stabilisingViscosity controlling
Disodium Cocoamphodiacetate
Hair conditioning, Sufactant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Hair conditioningSufactantFoam boostingHydrotropeSkin conditioning
+ 10 more — see the full ingredients list above
Glycerin
Denaturant, Fragrance
Low-hazard ingredient.Read moreShow less
EWG 2 CIR A DenaturantFragranceHair conditioningHumectantOral care agentOral health care drugSkin protectingViscosity decreasing agentPerfumingSolvent Good for Dry SkinFungal-acne trigger
Retinol
Skin conditioning
Potentially a skin irritantRead moreShow less
EWG 9 CIR A Skin conditioning Bad for Sensitive Skin
Salicylic Acid
Antiacne agent, Antidandruff agent
Skin irritation can occur at high concentrationRead moreShow less
EWG 4 CIR B Antiacne agentAntidandruff agentCorn/callus/wart removerDenaturantExfoliantFragranceHair conditioningSkin conditioningKeratolyticMaskingPreservative Good for Oily SkinBad for Sensitive Skin
Lactic Acid
Exfoliant, Fragrance
Skin irritation can occur at high concentrationRead moreShow less
EWG 4 CIR B ExfoliantFragranceHumectantPh adjusterSkin-conditioning agent -humectantSkin conditioningBuffering agent Bad for Sensitive Skin
Glycolic Acid
Exfoliant, Ph adjuster
Skin irritation can occur at high concentrationRead moreShow less
EWG 4 CIR B ExfoliantPh adjusterBuffering agent Good for Oily SkinBad for Sensitive Skin
Panthenol
Antistatic agent, Hair conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Antistatic agentHair conditioningSkin conditioning Good for Dry Skin
Sodium PCA
Hair conditioning, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR B Hair conditioningHumectantAntistatic agentSkin conditioning Good for Dry Skin
Allantoin
Skin conditioning, Skin protecting
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Skin conditioningSkin protectingSoothing Good for Oily SkinGood for Sensitive Skin
Polysorbate 20
Emulsifying, Surfactant
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR B EmulsifyingSurfactant Fungal-acne trigger
Citric Acid
Chelating agent, Fragrance
Skin irritation can occur at high concentrationRead moreShow less
EWG 2 CIR A Chelating agentFragrancePh adjusterBuffering agentMasking Bad for Sensitive Skin

How to use

How to use

  • 1 Where it fits: Apply after toner and before moisturiser — thinnest to thickest.
  • 2 Evening: Use at night — start 2–3× a week and build up as your skin tolerates it.
  • 3 Wear SPF the next day: Acids and retinoids increase sun sensitivity — daily sunscreen is a must while using this.

General guidance from this product's category and active ingredients — always follow the directions on the package.

Trust & honesty

Pregnancy & breastfeeding

Contains ingredients some choose to avoid or double-check while pregnant or nursing.

Often avoided
Retinoids (Vitamin A) (Retinol)

Topical retinoids (retinol, retinaldehyde, retinyl esters) are widely advised against in pregnancy as a precaution. The strongest evidence is for ORAL retinoids; topical absorption is low, but most clinicians err on the side of caution.

Use with caution
BHA (salicylic) (Salicylic Acid)

Low-strength topical salicylic acid (BHA) is generally considered fine. Caution is usually reserved for high-strength leave-on products and salicylic peels.

This is general information, not medical advice. Pregnancy guidance varies and depends on concentration and your individual situation — always check with your doctor, midwife or pharmacist. How we flag this.

Effective levels — general guide

The concentrations these actives are typically effective at in research — not a measurement of this product.

Retinoids (Vitamin A) 0.01–1%

Most studied between 0.1% and 1%. Higher is not automatically better — irritation climbs with dose, so a well-formulated lower strength is often the sweet spot.

Retinol

BHA (salicylic) 0.5–2%

Salicylic acid is OTC-capped at 2%; 0.5–2% is the usual leave-on range. Much below that it acts more as a soothing agent than an exfoliant.

Salicylic Acid

AHA (acid exfoliant) 5–10% (OTC)

OTC leave-on AHAs are usually 5–10%. The effect also depends on pH and free-acid value, not the percentage alone.

Lactic Acid, Glycolic Acid

INCI lists don't disclose amounts, and we don't claim to know this product's levels — these are the ranges these ingredients are usually effective at, so you can tell a real formula from "fairy-dusting" a marketed active. How we estimate this.

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