Ingredient review
Nostoc Flagelliforme Extract
INCI: NOSTOC FLAGELLIFORME EXTRACT
A hydrating, soothing extract from a unique cyanobacterium, but research on its cosmetic benefits is still emerging.
In plain English
Nostoc flagelliforme is a type of blue-green algae that grows in dry, harsh environments. In skincare, its extract is used to help hydrate and calm the skin. Think of it as a natural humectant, meaning it draws moisture into the skin, similar to hyaluronic acid or glycerin. It also contains compounds that may help soothe irritation.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is still emerging, so marketing claims deserve extra caution.
Risk flags are low for most users, though the finished product can still irritate.
- Source
- natural
- Evidence
- emerging
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Nostoc Flagelliforme Extract is generally a lower-concern ingredient when the full formula suits your skin.
Plain-English read
Treat this as a practical screening step before you compare products that contain this ingredient.
- Step 1Start with the score, then check the irritation and clogging risk before judging Nostoc Flagelliforme Extract.
- Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
- Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.
Score terms in plain English
Irritation risk
lowLess likely to sting, burn, or bother most users, though sensitive skin can still react.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
emergingThe ingredient may be promising, but claims should be treated more cautiously.
What it is
An extract derived from Nostoc flagelliforme, a cyanobacterium (often called 'fat choy' in Chinese cuisine). It is a natural source of polysaccharides, amino acids, and other bioactive compounds.
How it works
The polysaccharides in the extract form a thin, water-attracting film on the skin's surface, helping to bind moisture and reduce water loss. Some compounds may also have anti-inflammatory effects, helping to calm redness or sensitivity.
Pros
Good humectant
Helps draw moisture into the skin, making it feel more hydrated and plump.
Soothing potential
May help calm redness and irritation, making it suitable for sensitive skin types.
Cons and cautions
Limited research
Most evidence comes from lab studies, not large human trials, so its effectiveness is not as well-established as other humectants.
Sustainability concerns
Nostoc flagelliforme is overharvested in some regions for food, raising environmental and ethical questions about its use in cosmetics.
Best for
- People with dry or dehydrated skin
- Those looking for gentle, natural humectants
Use caution if
- Individuals with known allergies to blue-green algae or cyanobacteria
Usage tips
Safety summary
Nostoc flagelliforme extract is considered safe for topical use with a low risk of irritation or allergic reactions. However, due to limited human studies, it is best used in formulations with other well-studied humectants.
Research notes
Research is primarily in vitro (lab-based), showing antioxidant and anti-inflammatory activity. Human studies are scarce, so its cosmetic benefits are supported more by traditional use and ingredient similarity than by robust clinical trials.
Common label clues
- Typical concentration
- 0.1% to 2%
- Regulatory status
- Generally recognized as safe for use in cosmetics in the US and EU, with no specific restrictions beyond standard cosmetic ingredient regulations.
- Common uses
- Serums, Moisturizers, Sheet Masks
- Environmental note
- Overharvesting of wild Nostoc flagelliforme for food has led to environmental degradation in some areas. Look for sustainably sourced or lab-cultivated versions if this is a concern.
Good to know
- Nostoc flagelliforme is also known as 'fat choy' and is used in some Asian cuisines, but cosmetic-grade extracts are processed differently.
- It is a cyanobacterium, not a true algae, but is often grouped with algae extracts in skincare.
Common questions
What is Nostoc Flagelliforme Extract in beauty products?
Nostoc flagelliforme is a type of blue-green algae that grows in dry, harsh environments. In skincare, its extract is used to help hydrate and calm the skin. Think of it as a natural humectant, meaning it draws moisture into the skin, similar to hyaluronic acid or glycerin. It also contains compounds that may help soothe irritation.
What does Nostoc Flagelliforme Extract do in a beauty product?
The polysaccharides in the extract form a thin, water-attracting film on the skin's surface, helping to bind moisture and reduce water loss. Some compounds may also have anti-inflammatory effects, helping to calm redness or sensitivity.
Is Nostoc Flagelliforme Extract safe for most people?
Nostoc flagelliforme extract is considered safe for topical use with a low risk of irritation or allergic reactions. However, due to limited human studies, it is best used in formulations with other well-studied humectants.
Who should be careful with Nostoc Flagelliforme Extract?
Individuals with known allergies to blue-green algae or cyanobacteria
Research sources
Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.