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Ren Skincare REN Keep Young Beautiful Firming Smoothing Serum
Ren Skincare

Ren Skincare REN Keep Young Beautiful Firming Smoothing Serum

Efficacy58/100IrritancyHigh
See all ingredients

Works for

Moisturizing
Hexapeptide-11, Glycerin + 14 more
Works well
What the product description says
“Glycosaminoglycans and Hyaluronic Acid help attract and retain moisture to 'plump up' skin,”
Source: Cultbeauty

This product can help improve hydration of the skin with the two types of ingredients.

The first type is called “humectants”:
these ingredients help attract water. 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. The following ingredients in this product do the job: glycerin, hydrolyzed glycosaminoglycans.

This product also contains ingredients called “occlusives”. They help reduce the speed with which our skin loses moisture to the outside environment. These ingredients also help soften the upper layer of the skin, so it feels less tight and nicer to the touch. The following ingredients in this product do the job: caprylic/capric triglyceride, rosa canina fruit oil.

The following ingredients in this product are especially good for supporting the skin barrier and helping with the hydration level: hexapeptide-11

Hexapeptide-11HeroEffect: HighA type of peptide. Peptides are excellent moisturizers and might be able support collagen production reducing fine lines and wrinkles~0.4–0.9%
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~3.8–5.7%
Rosa canina fruit oilKey active· EmollientEffect: HighA great emollient. Contains vitamin E (tocopherol) which may give it some anti-oxidant properties. Can contain volatile compounds and can be irritating~2.2–3.2%
PhospholipidsKey activeEffect: MediumEmollients that are naturaly present in skin. In addition, they help water and oil mix together in the product~1.4–2.2%
Hydrolyzed glycosaminoglycansKey active· HumectantEffect: HighLong sugars that help attract water to the upper layer of the skin~0.95–1.45%
Sodium hyaluronateKey active· HumectantEffect: HighOne of the best moisturizing ingredients. Attracts water into the upper layer of the skin~0.5–1.15%
Caprylic/capric triglycerideKey active· Emollient, OcclusiveEffect: HighA good mix of fatty acids that forms a protective layer on the skin. Improves the shelf life of products. Derived from coconut and glycerin~0.5–1.15%
Dipalmitoyl hydroxyprolineKey activeEffect: MediumIs claimed to stimulate collagen and elastin production, as well as work as an anti-oxidant. There is however not enough evidence for its effectiveness~0.45–1%
Faex extractKey activeEffect: HighYeast extract. Helps attract water to the upper layer of the skin~0.35–0.8%
Magnesium aspartateKey activeEffect: MediumMight be helpful in restoring skin barrier function and calm down inflammation in skin~0.2–0.75%
Rosa damascena flower water· HumectantEffect: LowUsed to add a nice rose smell to the product. Might help attract water to the upper layer of the skin and have some anti-oxidant effect. Can be irritating~25–37%
Ascorbyl tetraisopalmitateEffect: Low, below effective doseA vitamin C derivative. Studies show that is might be effective in reducing hyperpigmentation, but there are no studies confirming that it is effectively converted into the bioavailable form of Vitamin C in skin. It is not clear how this derivative compares in effectiveness to the topical application of bioavailable form of vitamin C (L-ascorbic acid)~2.7–4%
Oryza sativa extractEffect: Low, below effective doseA grain extract that helps to create a thicker product consistency. It might have some anti-oxidant properties and help attract water to the upper layer of the skin~0.1–0.45%
TocopherolEffect: Low, below effective dosePure form of vitamin E. Can help moisturise and protect the skin from free radicals. Often used to help stabilise other ingredients or the formula itself~0.05–0.25%
Zinc gluconateUnder-dosedTypically used to stabilize the product formulations. It is a salt of a polyhydroxy acid (PHA) and in larger concentrations, can help shed the dead cells from the skin surface revealing smoother skin. It can help attract water to the upper layer of the skin. Might to be helpful against acne and clogged pores. Could be helpful in neutralizing free radicals, but solid research is missing. Due to the zinc content, might help calm down inflammation in skin~0.2–0.75%
Copper gluconateUnder-dosedTypically used to stabilize the product formulations. It is a salt of polyhydroxy acid (PHA) and in larger concentrations, can help shed the dead cells from the skin surface revealing smoother skin. It can help attract water to the upper layer of the skin. Might to be helpful against acne and clogged pores. Could be helpful in neutralizing free radicals, but solid research is missing~0.15–0.7%
Anti-aging
Hexapeptide-11, Dipalmitoyl hydroxyproline + 4 more
May help
What the product description says
“With regular use, fine lines & wrinkles are reduced; skin becomes firmer & plumper with an even tone & refined texture.”
Source: Cultbeauty

This product contains hexapeptide-11. This ingredient might be able to help reduce and prevent fine lines and wrinkles, improve skin elasticity and firmness, but there is not enough evidence that it actually works.

Hexapeptide-11Key activeEffect: MediumA type of peptide. Peptides are excellent moisturizers and might be able support collagen production reducing fine lines and wrinkles~0.4–0.9%
Dipalmitoyl hydroxyprolineEffect: LowIs claimed to stimulate collagen and elastin production, as well as work as an anti-oxidant. There is however not enough evidence for its effectiveness~0.45–1%
Zinc gluconateEffect: Low, below effective doseTypically used to stabilize the product formulations. It is a salt of a polyhydroxy acid (PHA) and in larger concentrations, can help shed the dead cells from the skin surface revealing smoother skin. It can help attract water to the upper layer of the skin. Might to be helpful against acne and clogged pores. Could be helpful in neutralizing free radicals, but solid research is missing. Due to the zinc content, might help calm down inflammation in skin~0.2–0.75%
Copper gluconateEffect: Low, below effective doseTypically used to stabilize the product formulations. It is a salt of polyhydroxy acid (PHA) and in larger concentrations, can help shed the dead cells from the skin surface revealing smoother skin. It can help attract water to the upper layer of the skin. Might to be helpful against acne and clogged pores. Could be helpful in neutralizing free radicals, but solid research is missing~0.15–0.7%
TocopherolEffect: Low, below effective dosePure form of vitamin E. Can help moisturise and protect the skin from free radicals. Often used to help stabilise other ingredients or the formula itself~0.05–0.25%
Ascorbyl tetraisopalmitateUnder-dosedA vitamin C derivative. Studies show that is might be effective in reducing hyperpigmentation, but there are no studies confirming that it is effectively converted into the bioavailable form of Vitamin C in skin. It is not clear how this derivative compares in effectiveness to the topical application of bioavailable form of vitamin C (L-ascorbic acid)~2.7–4%
Evens skin tone
Zinc gluconate, Copper gluconate + 1 more
Not delivered
What the product description says
“With regular use, fine lines & wrinkles are reduced; skin becomes firmer & plumper with an even tone & refined texture.”
Source: Cultbeauty

Effective ingredients missing or their concentration is too low

Zinc gluconateEffect: Low, below effective doseTypically used to stabilize the product formulations. It is a salt of a polyhydroxy acid (PHA) and in larger concentrations, can help shed the dead cells from the skin surface revealing smoother skin. It can help attract water to the upper layer of the skin. Might to be helpful against acne and clogged pores. Could be helpful in neutralizing free radicals, but solid research is missing. Due to the zinc content, might help calm down inflammation in skin~0.2–0.75%
Copper gluconateEffect: Low, below effective doseTypically used to stabilize the product formulations. It is a salt of polyhydroxy acid (PHA) and in larger concentrations, can help shed the dead cells from the skin surface revealing smoother skin. It can help attract water to the upper layer of the skin. Might to be helpful against acne and clogged pores. Could be helpful in neutralizing free radicals, but solid research is missing~0.15–0.7%
Ascorbyl tetraisopalmitateUnder-dosedA vitamin C derivative. Studies show that is might be effective in reducing hyperpigmentation, but there are no studies confirming that it is effectively converted into the bioavailable form of Vitamin C in skin. It is not clear how this derivative compares in effectiveness to the topical application of bioavailable form of vitamin C (L-ascorbic acid)~2.7–4%

Can it cause trouble?

Irritancy
8 strong irritants: Rosa damascena flower water, Alcohol + 6 more — patch-test recommended
High risk
We flagged 14 ingredients with irritancy potential. Severity depends on your sensitivity threshold; the table lists the worst offenders first.
IngredientFunctionIrritationEst. amount
Rosa damascena flower waterUsed to add a nice rose smell to the product. Might help attract water to the upper layer of the skin and have some anti-oxidant effect. Can be irritatingHigh~25–37%est.
AlcoholCan be drying and contribute to skin irritation. Used in formulars to dissolve other ingredients, create a thinner product consistency or for its antibacterial propertiesHigh~4.5–6.7%est.
Commiphora mukul resin extractA plant extract might be helpful in neutralizing free radicals and reducing inflammation in skinHigh~0.4–0.95%est.
Panax ginseng root extractA plant extract that might have some anti-inflammatory properties, but solid evidence is lacking. It can be irritatingHigh~0.35–0.85%est.
ParfumAn aromatic blend of unspecified and possibly irritating ingredientsHigh~0.1–0.45%est.
LinaloolA fragrance. Can be irritatingHigh~0.1–0.45%est.
LimoneneA common frangrance that can easily irritate skin, especially if exposed to air, light or heatHigh~0.1–0.4%est.
FarnesolAdded to create a nice product smell. Can be irritatingHigh~0.1–0.35%est.
Sodium hydroxymethylglycinateA preservative. Can be irritatingHigh~0.1–0.35%est.
Ascorbyl tetraisopalmitateA vitamin C derivative. Studies show that is might be effective in reducing hyperpigmentation, but there are no studies confirming that it is effectively converted into the bioavailable form of Vitamin C in skin. It is not clear how this derivative compares in effectiveness to the topical application of bioavailable form of vitamin C (L-ascorbic acid)Medium~2.7–4%est.
Rosa canina fruit oilA great emollient. Contains vitamin E (tocopherol) which may give it some anti-oxidant properties. Can contain volatile compounds and can be irritatingMedium~2.2–3.2%est.
Caprylic/capric triglycerideA good mix of fatty acids that forms a protective layer on the skin. Improves the shelf life of products. Derived from coconut and glycerinMedium~0.5–1.15%est.
Zinc gluconateTypically used to stabilize the product formulations. It is a salt of a polyhydroxy acid (PHA) and in larger concentrations, can help shed the dead cells from the skin surface revealing smoother skin. It can help attract water to the upper layer of the skin. Might to be helpful against acne and clogged pores. Could be helpful in neutralizing free radicals, but solid research is missing. Due to the zinc content, might help calm down inflammation in skinMedium~0.2–0.75%est.
Copper gluconateTypically used to stabilize the product formulations. It is a salt of polyhydroxy acid (PHA) and in larger concentrations, can help shed the dead cells from the skin surface revealing smoother skin. It can help attract water to the upper layer of the skin. Might to be helpful against acne and clogged pores. Could be helpful in neutralizing free radicals, but solid research is missingMedium~0.15–0.7%est.
Comedogenic
Clean of flagged comedogenic ingredients
None flagged

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Ingredients

Filter by role to see what each ingredient is doing.

Rosa damascena flower water~25–37%
Irritant · high
Irritation risk
High
Works for
MoisturizingAnti-oxidation

Used to add a nice rose smell to the product. Might help attract water to the upper layer of the skin and have some anti-oxidant effect. Can be irritating

More about Rosa damascena flower water
Glycerin~3.8–5.7%
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
Alcohol~4.5–6.7%
Irritant · high
Irritation risk
High
Works for
Antibacterial

Can be drying and contribute to skin irritation. Used in formulars to dissolve other ingredients, create a thinner product consistency or for its antibacterial properties

More about Alcohol
Cetearyl olivate~3–4.5%
Formula
Irritation risk
Low
Works for
Cleansing

Helps oil and water mix together

More about Cetearyl olivate
Ascorbyl tetraisopalmitate~2.7–4%
Under-dosedIrritant · medium
Irritation risk
Medium
Works for
Anti-oxidationEvens skin toneAnti-agingMoisturizing

A vitamin C derivative. Studies show that is might be effective in reducing hyperpigmentation, but there are no studies confirming that it is effectively converted into the bioavailable form of Vitamin C in skin. It is not clear how this derivative compares in effectiveness to the topical application of bioavailable form of vitamin C (L-ascorbic acid)

More about Ascorbyl tetraisopalmitate
Rosa canina fruit oil~2.2–3.2%
Key activeIrritant · medium
Irritation risk
Medium
Works for
MoisturizingAnti-oxidation

A great emollient. Contains vitamin E (tocopherol) which may give it some anti-oxidant properties. Can contain volatile compounds and can be irritating

More about Rosa canina fruit oil
Palmitoyl hydrolyzed wheat protein~1.9–2.8%
Formula
Irritation risk
Low
Works for
Cleansing
More about Palmitoyl hydrolyzed wheat protein
Phospholipids~1.4–2.2%
Key active
Irritation risk
Low
Works for
Moisturizing

Emollients that are naturaly present in skin. In addition, they help water and oil mix together in the product

More about Phospholipids
Zostera marina pectin
Not recognized
Sorbitan olivate~1.2–1.8%
Formula
Irritation risk
Low
Works for
Cleansing

Helps oil and water mix together

More about Sorbitan olivate
Hydrolyzed glycosaminoglycans~0.95–1.45%
Key active
Irritation risk
Low
Works for
Moisturizing

Long sugars that help attract water to the upper layer of the skin

More about Hydrolyzed glycosaminoglycans
Vaccinium vitis-idaea seed oil~0.85–1.3%
Formula
Irritation risk
Low
More about Vaccinium vitis-idaea seed oil
Sodium hyaluronate~0.5–1.15%
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
Dipalmitoyl hydroxyproline~0.45–1%
Key active
Irritation risk
Low
Works for
MoisturizingAnti-agingAnti-oxidation

Is claimed to stimulate collagen and elastin production, as well as work as an anti-oxidant. There is however not enough evidence for its effectiveness

More about Dipalmitoyl hydroxyproline
Caprylic/capric triglyceride~0.5–1.15%
Key activeIrritant · medium
Irritation risk
Medium
Works for
Moisturizing

A good mix of fatty acids that forms a protective layer on the skin. Improves the shelf life of products. Derived from coconut and glycerin

More about Caprylic/capric triglyceride
Hexapeptide-11~0.4–0.9%
Hero · Moisturizing
Irritation risk
Low
Works for
MoisturizingAnti-aging

A type of peptide. Peptides are excellent moisturizers and might be able support collagen production reducing fine lines and wrinkles

More about Hexapeptide-11
Commiphora mukul resin extract~0.4–0.95%
Irritant · high
Irritation risk
High
Works for
Anti-oxidationAnti-inflammatory

A plant extract might be helpful in neutralizing free radicals and reducing inflammation in skin

More about Commiphora mukul resin extract
Phenoxyethanol~0.4–0.9%
Formula
Irritation risk
Low

A preservative. It helps prevent bacterial growth in cosmetic products

More about Phenoxyethanol
Faex extract~0.35–0.8%
Key active
Irritation risk
Low
Works for
Moisturizing

Yeast extract. Helps attract water to the upper layer of the skin

More about Faex extract
Panax ginseng root extract~0.35–0.85%
Irritant · high
Irritation risk
High
Works for
Anti-inflammatoryAnti-oxidation

A plant extract that might have some anti-inflammatory properties, but solid evidence is lacking. It can be irritating

More about Panax ginseng root extract
Gynostemma pentaphyllum leaf extract~0.2–0.8%
Formula
Irritation risk
Low
More about Gynostemma pentaphyllum leaf extract
Magnesium aspartate~0.2–0.75%
Key active
Irritation risk
Low
Works for
Anti-inflammatoryMoisturizing

Might be helpful in restoring skin barrier function and calm down inflammation in skin

More about Magnesium aspartate
Zinc gluconate~0.2–0.75%
Under-dosedIrritant · medium
Irritation risk
Medium
Works for
MoisturizingAnti-oxidationExfoliationEvens skin toneAnti-inflammatoryAnti-agingAnti-blemish

Typically used to stabilize the product formulations. It is a salt of a polyhydroxy acid (PHA) and in larger concentrations, can help shed the dead cells from the skin surface revealing smoother skin. It can help attract water to the upper layer of the skin. Might to be helpful against acne and clogged pores. Could be helpful in neutralizing free radicals, but solid research is missing. Due to the zinc content, might help calm down inflammation in skin

More about Zinc gluconate
Copper gluconate~0.15–0.7%
Under-dosedIrritant · medium
Irritation risk
Medium
Works for
MoisturizingAnti-agingEvens skin toneAnti-blemishExfoliationAnti-oxidation

Typically used to stabilize the product formulations. It is a salt of polyhydroxy acid (PHA) and in larger concentrations, can help shed the dead cells from the skin surface revealing smoother skin. It can help attract water to the upper layer of the skin. Might to be helpful against acne and clogged pores. Could be helpful in neutralizing free radicals, but solid research is missing

More about Copper gluconate
Parfum~0.1–0.45%
Irritant · high
Irritation risk
High

An aromatic blend of unspecified and possibly irritating ingredients

More about Parfum
Linalool~0.1–0.45%
Irritant · high
Irritation risk
High

A fragrance. Can be irritating

More about Linalool
Limonene~0.1–0.4%
Irritant · high
Irritation risk
High

A common frangrance that can easily irritate skin, especially if exposed to air, light or heat

More about Limonene
Farnesol~0.1–0.35%
Irritant · high
Irritation risk
High

Added to create a nice product smell. Can be irritating

More about Farnesol
Oryza sativa extract~0.1–0.45%
Formula
Irritation risk
Low
Works for
MoisturizingAnti-oxidation

A grain extract that helps to create a thicker product consistency. It might have some anti-oxidant properties and help attract water to the upper layer of the skin

More about Oryza sativa extract
Sodium hydroxymethylglycinate~0.1–0.35%
Irritant · high
Irritation risk
High

A preservative. Can be irritating

More about Sodium hydroxymethylglycinate
Xanthan gum~0.05–0.25%
Formula
Irritation risk
Low
Works for
Cleansing

Used to create a thicker product consistency

More about Xanthan gum
Tocopherol~0.05–0.25%
Formula
Irritation risk
Low
Works for
Anti-oxidationAnti-agingAnti-inflammatoryMoisturizing

Pure form of vitamin E. Can help moisturise and protect the skin from free radicals. Often used to help stabilise other ingredients or the formula itself

More about Tocopherol
Ingredient list view

Rosa damascena flower water, Glycerin, Alcohol, Cetearyl olivate, Ascorbyl tetraisopalmitate, Rosa canina fruit oil, Palmitoyl hydrolyzed wheat protein, Phospholipids, Unknown, Sorbitan olivate, Hydrolyzed glycosaminoglycans, Vaccinium vitis-idaea seed oil, Sodium hyaluronate, Dipalmitoyl hydroxyproline, Caprylic/capric triglyceride, Hexapeptide-11, Commiphora mukul resin extract, Phenoxyethanol, Faex extract, Panax ginseng root extract, Gynostemma pentaphyllum leaf extract, Magnesium aspartate, Zinc gluconate, Copper gluconate, Parfum, Linalool, Limonene, Farnesol, Oryza sativa extract, Sodium hydroxymethylglycinate, Xanthan gum, Tocopherol

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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
Ren SkincareREN Keep Young Beautiful Firming Smoothing SerumYOUR PRODUCTMANTLETHE WOW SERUMZelensPower C - Collagen-boosting & Brighteningsk.inflash | repair shot
Match—47%45%45%
Price——$63.03$30.98
Shared key ingredients—4 of 113 of 113 of 11
Key difference—Beta-SitosterolSaccharomyces Ferment Lysate FiltrateHydroxypinacolone Retinoate
Irritancy High Medium Low Medium
Drying alcohol Contains drying alcohol ———
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Sources cited in this review

Every concentration estimate and effectiveness label is anchored to one of these 22 studies and safety reviews.

  1. 1
    Annex I: Clinical evidence regarding sensitisation to individual fragrance chemicals and to natural extracts ec.europa.eu
  2. 2
    Glycerol and the skin: holistic approach to its origin and functionsncbi.nlm.nih.gov
  3. 3
    Assessment of penetration of Ascorbyl Tetraisopalmitate into biological membranes by molecular dynamicssciencedirect.com
  4. 4
    Stability evaluation of tocopheryl acetate and ascorbyl tetraisopalmitate in isolation and incorporated in cosmetic formulations using thermal analysisscielo.br
  5. 5
    A new lipophilic pro-vitamin C, tetra-isopalmitoyl ascorbic acid (VC-IP), prevents UV-induced skin pigmentation through its anti-oxidative propertiessciencedirect.com
  6. 6
    New lipophilic pro-vitamin C, tetra-isopalmitoyl ascorbic acid (VC-IP), suppresses senile lentigo through controlling of melanocytes-keratinocytes interactionmorressier.com
Ren Skincare REN Keep Young Beautiful Firming Smoothing Serum
Ren SkincareREN Keep Young Beautiful Firming Smoothing Serum
Find on Amazon

Affiliate links · As an Amazon Associate, WIMJ earns from qualifying purchases.

Find on Amazon

As an Amazon Associate, WIMJ earns from qualifying purchases.