No7 Prime Forever Serum

No7 Prime Forever Serum

Efficacy100/100IrritancyMedium

Works for

Anti-aging
Niacinamide, Ascorbyl glucoside
Works well
What the product description says
“Pause visible skin aging in minutes** with our advanced youth-preserving serum** designed for fast absorption and instant radiance*.”
Source: No7 US

This product can help reduce and prevent fine lines and wrinkles, improve skin elasticity and firmness because it contains niacinamide.

Keep in mind that it typically takes at least 6 weeks to notice any results because the changes that are needed to improve fine lines and elasticity happen in the deeper layers of the skin. No topical anti-aging product can “erase” wrinkles or fully reverse signs of aging.

NiacinamideKey activeEffect: HighIs proven to be effective in reducing blemishes, evening out skin tone and helping to improve lines and wrinkles. It helps the skin to repair sun damage, calm down inflammation and keep maintain good levels of moisture. The concentration of about 2% is effective for supporting the skin barrier and evening out the skin tone. Concentration of 4-6% is better for helping with acne and balancing the sebum production~2–3%
Ascorbyl glucosideUnder-dosedA vitamin C derivative that is more stable but less potent than pure form of vitamin C. Has a potential to boost collagen production, nutralise free radicals and reduce hyperpigmentation, but the required concentration is likely to be much higher than for the pure form of vitamin C, limiting the ingredient's effectiveness in products~0.15–0.55%
Evens skin tone
Niacinamide, Ascorbyl glucoside
Works well
What the product description says
“Niacinamide - Helps support the skin's moisture barrier for a smoother, brighter-looking complexion.”
Source: No7 US

This product can help reduce hypepigmentation and even out the skin tone because it contains the following effective ingredients: niacinamide

Keep in mind that you would need to apply any topical skincare targetted at hypigmentation consistently for a couple of months to get a result. No topical skincare product can help get rid of hyperpigmentation (including post-acne marks and age spots) instantly.

NiacinamideKey activeEffect: HighIs proven to be effective in reducing blemishes, evening out skin tone and helping to improve lines and wrinkles. It helps the skin to repair sun damage, calm down inflammation and keep maintain good levels of moisture. The concentration of about 2% is effective for supporting the skin barrier and evening out the skin tone. Concentration of 4-6% is better for helping with acne and balancing the sebum production~2–3%
Ascorbyl glucosideUnder-dosedA vitamin C derivative that is more stable but less potent than pure form of vitamin C. Has a potential to boost collagen production, nutralise free radicals and reduce hyperpigmentation, but the required concentration is likely to be much higher than for the pure form of vitamin C, limiting the ingredient's effectiveness in products~0.15–0.55%
Moisturizing
Niacinamide, Glycerin + 4 more
Works well
What the product description says
“100HR Hydration^ - Delivers long-lasting moisture.”
Source: No7 US

This product contains good ingredients to attract water to the upper layer of the skin. These ingredients are called "humectants": glycerin, sodium hyaluronate.

When humectants are on the surface of the skin, they “pull in” the moisture from the outside environment, or from within deeper layers of the skin. If the air is dry, humectants can speed up the moisture loss from the skin. This is why it is a good idea to use another product on top of this one to help "seal in" the moisture (look for ingredients like dimethicone, squalane, oils and butters).

The following ingredients in this product are especially good for supporting the skin barrier and helping with the hydration level: niacinamide

NiacinamideHeroEffect: HighIs proven to be effective in reducing blemishes, evening out skin tone and helping to improve lines and wrinkles. It helps the skin to repair sun damage, calm down inflammation and keep maintain good levels of moisture. The concentration of about 2% is effective for supporting the skin barrier and evening out the skin tone. Concentration of 4-6% is better for helping with acne and balancing the sebum production~2–3%
GlycerinKey active· HumectantEffect: HighOne of the best moisturizing ingredients. Naturally present in skin. It attracts water to the upper layer of the skin working as a humectant~2.7–4.1%
Hydrolyzed rice proteinKey active· HumectantEffect: MediumHelps attract water to the upper layer of the skin. Might have some anti-oxidant properties~0.3–0.75%
Sodium hyaluronateKey active· HumectantEffect: HighOne of the best moisturizing ingredients. Attracts water into the upper layer of the skin~0.2–0.75%
Butylene glycol· HumectantEffect: LowUsed to create a nice product texture and help delivery of other ingredients. Might be somewhat helpful in attracting water to the upper layer of the skin~5.6–8.4%
Pentylene glycol· EmollientEffect: LowUsed to preserve products, dissolve other ingredients and create a nice product texture~3.9–5.8%
Anti-oxidation
Side benefit · Camellia japonica flower extract, Dimethylmethoxy chromanol + 4 more
Works well

This product contains antioxidants (dimethylmethoxy chromanol) that can help neutralize free radicals in skin. By doing so, they can lessen the damage the skin gets from the UV light (sun).

The following ingredients - camellia japonica flower extract also can have an antioxidant effect, but there is less evidence to confirm their effectiveness in skin.

Camellia japonica flower extractKey activeEffect: MediumA plant extract that might help neutralize free radicals in skin~0.1–0.4%
Dimethylmethoxy chromanolKey activeEffect: HighCan help neutralize free radicals in skin~0.05–0.2%
Tocopheryl acetateEffect: LowA more stable but less bio-available form of vitamin E compared to Tocopherol. Might help moisturize and protect the skin from free radicals, but mostly used in low concentrations to stabilize other ingredients.~0.95–1.4%
Hydrolyzed rice proteinEffect: LowHelps attract water to the upper layer of the skin. Might have some anti-oxidant properties~0.3–0.75%
Myrtus communis leaf extractEffect: LowA plant extract that contains an essential oil and often used for its fragrance. Can be irritating. It has some anti-bacterial and anti-oxidant properties~0.1–0.35%
Ascorbyl glucosideUnder-dosedA vitamin C derivative that is more stable but less potent than pure form of vitamin C. Has a potential to boost collagen production, nutralise free radicals and reduce hyperpigmentation, but the required concentration is likely to be much higher than for the pure form of vitamin C, limiting the ingredient's effectiveness in products~0.15–0.55%
Anti-blemish
Side benefit · Niacinamide
Works well

This product can help reduce breakouts and clogged pores because it contains the following ingredient: niacinamide. This ingredient is used for treating acne and can have a noticeable effect.

NiacinamideHeroEffect: HighIs proven to be effective in reducing blemishes, evening out skin tone and helping to improve lines and wrinkles. It helps the skin to repair sun damage, calm down inflammation and keep maintain good levels of moisture. The concentration of about 2% is effective for supporting the skin barrier and evening out the skin tone. Concentration of 4-6% is better for helping with acne and balancing the sebum production~2–3%

Can it cause trouble?

Irritancy
1 strong irritant: Myrtus communis leaf extract
Medium risk
We flagged 10 ingredients with irritancy potential. Severity depends on your sensitivity threshold; the table lists the worst offenders first.
IngredientFunctionIrritationEst. amount
Decyl glucosideHelps oil and water mix together. Can be irritatingHigh~0.2–0.7%est.
Myrtus communis leaf extractA plant extract that contains an essential oil and often used for its fragrance. Can be irritating. It has some anti-bacterial and anti-oxidant propertiesHigh~0.1–0.35%est.
Camellia japonica flower extractA plant extract that might help neutralize free radicals in skinHigh~0.1–0.4%est.
Pentylene glycolUsed to preserve products, dissolve other ingredients and create a nice product textureMedium~3.9–5.8%est.
Isoamyl laurateHelps stabilize emulsions and create a nice product textureMedium~1.7–2.5%est.
Tocopheryl acetateA more stable but less bio-available form of vitamin E compared to Tocopherol. Might help moisturize and protect the skin from free radicals, but mostly used in low concentrations to stabilize other ingredients.Medium~0.95–1.4%est.
Citric acidCan work as an exfoliant but is typically used to adjust the product pHMedium~0.2–0.75%est.
Ascorbyl glucosideA vitamin C derivative that is more stable but less potent than pure form of vitamin C. Has a potential to boost collagen production, nutralise free radicals and reduce hyperpigmentation, but the required concentration is likely to be much higher than for the pure form of vitamin C, limiting the ingredient's effectiveness in productsMedium~0.15–0.55%est.
T-butyl alcoholUsed to dissolve other ingredients and to improve smell of products. It could be irritatingMedium~0.1–0.4%est.
Potassium hydroxideUsed to adjust the pH level of productsMedium~0.1–0.4%est.
Comedogenic
Clean of flagged comedogenic ingredients
None flagged

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Ingredients

Filter by role to see what each ingredient is doing.

Water~40–60%
Formula
Irritation risk
Low

Plain old water

More about Water
Butylene glycol~5.6–8.4%
Formula
Irritation risk
Low
Works for
Moisturizing

Used to create a nice product texture and help delivery of other ingredients. Might be somewhat helpful in attracting water to the upper layer of the skin

More about Butylene glycol
Pentylene glycol~3.9–5.8%
Irritant · medium
Irritation risk
Medium
Works for
Moisturizing

Used to preserve products, dissolve other ingredients and create a nice product texture

More about Pentylene glycol
Glycerin~2.7–4.1%
Key active
Irritation risk
Low
Works for
Moisturizing

One of the best moisturizing ingredients. Naturally present in skin. It attracts water to the upper layer of the skin working as a humectant

More about Glycerin
Niacinamide~2–3%
Hero · Moisturizing, Anti-blemish
Irritation risk
Low
Works for
Anti-agingAnti-blemishEvens skin toneMoisturizingReduces irritationAntibacterialAnti-inflammatoryReduces redness

Is proven to be effective in reducing blemishes, evening out skin tone and helping to improve lines and wrinkles. It helps the skin to repair sun damage, calm down inflammation and keep maintain good levels of moisture. The concentration of about 2% is effective for supporting the skin barrier and evening out the skin tone. Concentration of 4-6% is better for helping with acne and balancing the sebum production

More about Niacinamide
Isoamyl laurate~1.7–2.5%
Irritant · medium
Irritation risk
Medium

Helps stabilize emulsions and create a nice product texture

More about Isoamyl laurate
Polysorbate 20~1.4–2.1%
Formula
Irritation risk
Low
Works for
Cleansing

Helps oil and water mix together

More about Polysorbate 20
Phenoxyethanol~0.5–1%
Formula
Irritation risk
Low

A preservative. It helps prevent bacterial growth in cosmetic products

More about Phenoxyethanol
Tocopheryl acetate~0.95–1.4%
Irritant · medium
Irritation risk
Medium
Works for
Anti-oxidation

A more stable but less bio-available form of vitamin E compared to Tocopherol. Might help moisturize and protect the skin from free radicals, but mostly used in low concentrations to stabilize other ingredients.

More about Tocopheryl acetate
Silica~1–1.6%
Formula
Irritation risk
Low

Used to absorb oil and can temporarily mattify skin

More about Silica
Ammonium acryloyldimethyltaurate/vp copolymer~0.5–1.1%
Formula
Irritation risk
Low

Increases thickness of a product. Texture enhancer for oil-in-water emulsions

More about Ammonium acryloyldimethyltaurate/vp copolymer
Xanthan gum~0.4–0.9%
Formula
Irritation risk
Low
Works for
Cleansing

Used to create a thicker product consistency

More about Xanthan gum
Propanediol~0.35–0.85%
Formula
Irritation risk
Low

Acts as a solvent for other ingredients. Speeds up the absorption of other ingredients into the skin

More about Propanediol
Hydrolyzed rice protein~0.3–0.75%
Key active
Irritation risk
Low
Works for
MoisturizingAnti-oxidation

Helps attract water to the upper layer of the skin. Might have some anti-oxidant properties

More about Hydrolyzed rice protein
Sodium hyaluronate~0.2–0.75%
Key active
Irritation risk
Low
Works for
Moisturizing

One of the best moisturizing ingredients. Attracts water into the upper layer of the skin

More about Sodium hyaluronate
Citric acid~0.2–0.75%
Irritant · medium
Irritation risk
Medium

Can work as an exfoliant but is typically used to adjust the product pH

More about Citric acid
Tetrasodium glutamate diacetate~0.2–0.7%
Formula
Irritation risk
Low

Helps stabilize the product formulation

More about Tetrasodium glutamate diacetate
Ascorbyl glucoside~0.15–0.55%
Under-dosedIrritant · medium
Irritation risk
Medium
Works for
Anti-oxidationAnti-agingEvens skin tone

A vitamin C derivative that is more stable but less potent than pure form of vitamin C. Has a potential to boost collagen production, nutralise free radicals and reduce hyperpigmentation, but the required concentration is likely to be much higher than for the pure form of vitamin C, limiting the ingredient's effectiveness in products

More about Ascorbyl glucoside
Decyl glucoside~0.2–0.7%
Irritant · high
Irritation risk
High
Works for
Cleansing

Helps oil and water mix together. Can be irritating

More about Decyl glucoside
T-butyl alcohol~0.1–0.4%
Irritant · medium
Irritation risk
Medium

Used to dissolve other ingredients and to improve smell of products. It could be irritating

More about T-butyl alcohol
Myrtus communis leaf extract~0.1–0.35%
Irritant · high
Irritation risk
High
Works for
AntibacterialAnti-oxidation

A plant extract that contains an essential oil and often used for its fragrance. Can be irritating. It has some anti-bacterial and anti-oxidant properties

More about Myrtus communis leaf extract
Potassium hydroxide~0.1–0.4%
Irritant · medium
Irritation risk
Medium

Used to adjust the pH level of products

More about Potassium hydroxide
Camellia japonica flower extract~0.1–0.4%
Key activeIrritant · high
Irritation risk
High
Works for
Anti-oxidation

A plant extract that might help neutralize free radicals in skin

More about Camellia japonica flower extract
Sodium benzoate~0.05–0.25%
Formula
Irritation risk
Low

A preservative

More about Sodium benzoate
Dimethylmethoxy chromanol~0.05–0.2%
Key active
Irritation risk
Low
Works for
Anti-oxidation

Can help neutralize free radicals in skin

More about Dimethylmethoxy chromanol
Palmitoyl tetrapeptide-94
Not recognized
Palmitoyl tetrapeptide-95
Not recognized
Ingredient list view

Water, Butylene glycol, Pentylene glycol, Glycerin, Niacinamide, Isoamyl laurate, Polysorbate 20, Phenoxyethanol, Tocopheryl acetate, Silica, Ammonium acryloyldimethyltaurate/vp copolymer, Xanthan gum, Propanediol, Hydrolyzed rice protein, Sodium hyaluronate, Citric acid, Tetrasodium glutamate diacetate, Ascorbyl glucoside, Decyl glucoside, T-butyl alcohol, Myrtus communis leaf extract, Potassium hydroxide, Camellia japonica flower extract, Sodium benzoate, Dimethylmethoxy chromanol, Unknown, Unknown

Compare prices

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Amazon USPrice as of 11/10 21:21 GMT
$30.00
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No7 US1 fl oz
$39.99
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Worth comparing, line by line.

Match % combines shared ingredients, the first five ingredients, shared actives and hero ingredients, irritancy (lower counts in the alternative's favour), texture and body area. Only products in the same routine step are compared.

Side-by-side comparison of this product against its closest alternatives
No7Prime Forever SerumYOUR PRODUCTPaula's choiceNiacinamide 20% TreatmentVotaryVitamin C Glow SerumSkin Inc Supplement BarVitamin B3+ Serum
Match—99%96%96%
Price$39.99$51.19+$11.20$112.29+$72.30$35.00−$4.99
Shared key ingredients—4 of 63 of 63 of 6
Key difference—PanthenolAlpha-ArbutinPanthenol
Irritancy Medium Low Low Low
Drying alcohol————
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Sources cited in this review

Every concentration estimate and effectiveness label is anchored to one of these 14 studies and safety reviews.

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