Ingredient review
PEG-9 Dinicotinate
INCI: PEG-9 Dinicotinate
PEG-9 Dinicotinate is a synthetic derivative of niacin (vitamin B3) that may support skin microcirculation and barrier function, but research is limited and it's less common than niacinamide.
In plain English
PEG-9 Dinicotinate is a lab-made ingredient that combines a form of vitamin B3 (nicotinic acid) with a PEG chain. In skincare, it's thought to help improve blood flow to the skin's surface (which can give a temporary glow) and support the skin's natural barrier. However, it's not as well-studied as niacinamide, the more common form of vitamin B3. You'll find it in some serums and creams aimed at brightening or anti-aging, but it's not a star ingredient you need to seek out.
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
- synthetic
- Evidence
- emerging
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
PEG-9 Dinicotinate 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 PEG-9 Dinicotinate.
- 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
PEG-9 Dinicotinate is a synthetic ester of nicotinic acid (a form of vitamin B3) and PEG-9, a polyethylene glycol chain. It is used in cosmetics as a skin conditioning agent and vasodilator, meaning it can temporarily widen blood vessels near the skin's surface.
How it works
When applied to the skin, PEG-9 Dinicotinate is thought to release nicotinic acid, which can stimulate blood flow (vasodilation) in the upper layers of the skin. This temporary increase in circulation may give the skin a flushed, glowing appearance and could help deliver oxygen and nutrients to skin cells. The PEG component helps the ingredient spread easily and absorb into the skin.
Pros
May boost skin glow
By temporarily increasing blood flow to the skin's surface, PEG-9 Dinicotinate can give a subtle, healthy-looking flush that some users find appealing.
Supports barrier function
As a niacin derivative, it may help strengthen the skin's natural barrier, reducing moisture loss and improving resilience over time.
Cons and cautions
Limited research
Compared to niacinamide, there are far fewer studies on PEG-9 Dinicotinate, so its long-term benefits and safety profile are less established.
Potential for flushing
The vasodilating effect can cause temporary redness or a warm sensation, which may be uncomfortable for those with sensitive or rosacea-prone skin.
Best for
- People looking for a mild vasodilator to add a temporary glow to dull skin
- Those interested in niacin-based ingredients but want a different delivery form
Use caution if
- Individuals with very sensitive or reactive skin who may experience flushing
Usage tips
Safety summary
PEG-9 Dinicotinate is considered safe for topical use in cosmetics at typical concentrations. The main safety consideration is temporary skin flushing or irritation in sensitive individuals. It is not known to be comedogenic or toxic. However, long-term safety data is limited compared to more common niacin derivatives.
Research notes
Research on PEG-9 Dinicotinate specifically is sparse. Most evidence comes from studies on niacin (nicotinic acid) and its vasodilating effects. One small study suggested that a similar PEG-niacin ester improved skin barrier function and microcirculation, but larger, more rigorous trials are needed. The ingredient is not as well-studied as niacinamide.
Common label clues
- Typical concentration
- 0.5% to 2%
- Regulatory status
- Approved for use in cosmetics in the EU and US, but not as widely reviewed as niacinamide. No specific restrictions beyond general cosmetic safety standards.
- Common uses
- Serums, Moisturizers, Eye creams, Anti-aging products
- Environmental note
- PEG compounds are synthetic and may not be biodegradable. However, PEG-9 Dinicotinate is used in low concentrations, so its environmental impact is likely minimal.
Good to know
- PEG-9 Dinicotinate is not the same as niacinamide; it's a different chemical form of vitamin B3 with distinct properties.
- The 'PEG' part means it contains polyethylene glycol, which is generally considered safe in cosmetics but may be a concern for some consumers seeking PEG-free products.
Common questions
What is PEG-9 Dinicotinate in beauty products?
PEG-9 Dinicotinate is a lab-made ingredient that combines a form of vitamin B3 (nicotinic acid) with a PEG chain. In skincare, it's thought to help improve blood flow to the skin's surface (which can give a temporary glow) and support the skin's natural barrier. However, it's not as well-studied as niacinamide, the more common form of vitamin B3. You'll find it in some serums and creams aimed at brightening or anti-aging, but it's not a star ingredient you need to seek out.
What does PEG-9 Dinicotinate do in a beauty product?
When applied to the skin, PEG-9 Dinicotinate is thought to release nicotinic acid, which can stimulate blood flow (vasodilation) in the upper layers of the skin. This temporary increase in circulation may give the skin a flushed, glowing appearance and could help deliver oxygen and nutrients to skin cells. The PEG component helps the ingredient spread easily and absorb into the skin.
Is PEG-9 Dinicotinate safe for most people?
PEG-9 Dinicotinate is considered safe for topical use in cosmetics at typical concentrations. The main safety consideration is temporary skin flushing or irritation in sensitive individuals. It is not known to be comedogenic or toxic. However, long-term safety data is limited compared to more common niacin derivatives.
Who should be careful with PEG-9 Dinicotinate?
Individuals with very sensitive or reactive skin who may experience flushing
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.