A synthetic film-forming ingredient used in nail products; it helps coatings adhere and last, but may cause skin irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
Beauty ingredient research
Browse the review database to understand what an ingredient is, what it does in a beauty formula, when it is useful, and when it deserves caution across skincare, haircare, bodycare, makeup, and more.
20769
Reviewed ingredients
524
Low-concern standouts
2884
Need usage caution
A synthetic film-forming ingredient used in nail products; it helps coatings adhere and last, but may cause skin irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
Hematin is a natural pigment from blood that can add color to cosmetics, but its skincare benefits are not well-studied and it may stain skin or fabrics.
Irritation
low
Source
natural
A gentle plant extract with antioxidant potential, but research is limited and benefits are not yet well-established.
Irritation
low
Source
natural
A gentle bark extract with antioxidant potential, but research on its specific skin benefits is still limited.
Irritation
low
Source
natural
A gentle plant extract with antioxidant potential, but research on its specific skincare benefits is still limited.
Irritation
low
Source
natural
A fragrant essential oil with limited skincare research; best for those who enjoy natural, woodsy scents and have no sensitivity to essential oils.
Irritation
moderate
Source
natural
A fragrant essential oil with limited skincare research; best used in low concentrations for its scent rather than proven skin benefits.
Irritation
moderate
Source
natural
Hemocyanin is a novel marine-derived antioxidant with limited research in cosmetics; it may help protect skin from oxidative stress but lacks robust human studies.
Irritation
low
Source
natural
Hemoglobin is a trendy ingredient that may temporarily oxygenate skin and give a subtle flush, but its long-term benefits are not well proven.
Irritation
low
Source
natural
A gentle, antioxidant-rich botanical extract that may help calm skin and fight free radical damage, but research is still emerging.
Irritation
low
Source
natural
A gentle, antioxidant-rich botanical extract that may help calm skin and protect against environmental stress, but it is not the same as CBD or THC.
Irritation
low
Source
natural
Hemp nettle extract is a gentle botanical with potential soothing and antioxidant benefits, but research is limited and it's not a standout ingredient.
Irritation
low
Source
natural
A gentle, plant-based emollient that helps soften and soothe the skin without clogging pores.
Irritation
low
Source
natural
A gentle, natural exfoliant packed with fatty acids and antioxidants, ideal for dry or sensitive skin types.
Irritation
low
Source
natural
A water-friendly version of hemp seed oil that moisturizes without greasiness, ideal for sensitive and acne-prone skin.
Irritation
low
Source
semi-synthetic
A natural, biodegradable physical exfoliant from hemp stems that gently buffs away dead skin cells without harsh microplastics.
Irritation
low
Source
natural
Henna is a natural colorant and conditioner, but its safety depends on purity and source—avoid products with added metallic salts or synthetic dyes.
Irritation
low
Source
natural
A lab-grown henna extract that offers antioxidant benefits without the staining or irritation of traditional henna.
Irritation
low
Source
biotech
Henna extract is a natural colorant and conditioner, but it can cause allergic reactions in sensitive individuals and may not be suitable for all hair types.
Irritation
low
Source
natural
A gentle plant wax from henna that adds richness and moisture to skincare without the staining properties of henna leaf.
Irritation
low
Source
natural
Heparin may help reduce puffiness and support microcirculation in skincare, but its topical benefits are less established than its medical use as a blood thinner.
Irritation
low
Source
natural
A gentle, plant-derived antioxidant extract that may help calm skin and fight free radical damage, though research is still early.
Irritation
low
Source
natural
A gentle plant extract with antioxidant potential, but research is limited and benefits are not yet well-established.
Irritation
low
Source
natural
Heptadecadienyl Furan is a synthetic fragrance ingredient with limited safety data; it may cause skin irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
A lightweight, non-comedogenic emollient that gives a silky feel without clogging pores, ideal for oily and acne-prone skin types.
Irritation
low
Source
synthetic
A synthetic scent ingredient that adds a warm, woody note; generally safe at low levels but may cause sensitivity in some individuals.
Irritation
low
Source
synthetic
Heptanal is a synthetic fragrance ingredient that adds a fresh scent but may cause skin irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
A synthetic fragrance ingredient that adds a pleasant scent but offers no skincare benefits; safe at low levels but may cause sensitivity in some individuals.
Irritation
low
Source
synthetic
Heptane is an effective fast-evaporating solvent, but its high volatility and potential for irritation make it a cautious choice for sensitive skin.
Irritation
moderate
Source
synthetic
Heptanoic acid is a mild organic acid that helps balance product pH and can support preservative systems, but it may cause slight irritation in sensitive skin at higher concentrations.
Irritation
moderate
Source
natural
Heptanol is a mild fatty alcohol used mainly for fragrance and a light emollient feel, with low irritation potential.
Irritation
low
Source
synthetic
A synthetic peptide that may help smooth fine lines and support skin firmness with a low risk of irritation.
Irritation
low
Source
synthetic
A synthetic peptide designed to support collagen and reduce fine lines, generally well-tolerated but with limited independent research.
Irritation
low
Source
synthetic
Heptapeptide-17 is a synthetic peptide that may help improve skin firmness and reduce fine lines, but research is still emerging and results vary.
Irritation
low
Source
synthetic
Heptapeptide-28 is a synthetic peptide that may help reduce fine lines and improve skin firmness, with low irritation risk and moderate research support.
Irritation
low
Source
synthetic
Heptapeptide-31 is a synthetic peptide that may help support skin firmness and reduce fine lines, but research is still emerging and results vary.
Irritation
low
Source
synthetic
Heptapeptide-32 is a synthetic peptide that may help reduce fine lines and improve skin firmness by signaling collagen production, but research is still emerging.
Irritation
low
Source
synthetic
Heptapeptide-34 is a lab-made peptide that may help support skin structure, but research is still early and results vary.
Irritation
low
Source
synthetic
Heptapeptide-35 is a synthetic peptide that may help reduce the appearance of fine lines by signaling skin to support collagen, but research is still emerging.
Irritation
low
Source
synthetic
Heptapeptide-36 is a lab-made peptide that may help support skin firmness and reduce the appearance of fine lines, but research is still early.
Irritation
low
Source
synthetic
A synthetic peptide that may help firm skin and soften wrinkles, but research is still early.
Irritation
low
Source
synthetic
Heptapeptide-37 is a synthetic peptide that may help support skin firmness and reduce fine lines, but research is still limited compared to more established peptides.
Irritation
low
Source
synthetic
A synthetic peptide that may help improve skin firmness and reduce fine lines, but research is still emerging.
Irritation
low
Source
synthetic
Heptapeptide-38 is a synthetic peptide that may help improve skin firmness and reduce the appearance of fine lines, with low irritation risk.
Irritation
low
Source
synthetic
A synthetic peptide that may help improve skin firmness and smooth fine lines, but research is still emerging.
Irritation
low
Source
synthetic
A synthetic peptide that signals skin to produce more collagen, helping to soften wrinkles and improve firmness over time.
Irritation
low
Source
synthetic
A synthetic peptide that may help firm skin and soften lines, but research is still early and results vary.
Irritation
low
Source
synthetic
A synthetic peptide that may help improve skin firmness and reduce fine lines, but more human studies are needed.
Irritation
low
Source
synthetic
Heptapeptide-41 is a promising synthetic peptide that may help firm skin and soften wrinkles, but research is still early and results vary.
Irritation
low
Source
synthetic
A synthetic peptide that may help reduce fine lines and improve skin firmness, but research is still early and results vary.
Irritation
low
Source
synthetic
Heptapeptide-7 is a synthetic peptide that signals skin to produce more collagen, helping soften fine lines over time with minimal irritation.
Irritation
low
Source
synthetic
A synthetic peptide that signals skin to produce more collagen, helping soften fine lines over time.
Irritation
low
Source
synthetic
Heptapeptide-9 is a synthetic peptide that may help firm skin and soften fine lines by signaling collagen production, with low irritation risk.
Irritation
low
Source
synthetic
Skin conditioning agent
HEPTASODIUM HEXACARBOXYMETHYL DIPEPTIDE-12
A synthetic peptide that may help reduce fine lines and improve skin firmness, but research is still emerging.
Irritation
low
Source
synthetic
Heptyl Acetate is a synthetic fragrance ingredient that adds a fruity, floral scent but offers no skincare benefits.
Irritation
low
Source
synthetic
Heptyl Butyrate is a synthetic fragrance ester that adds a fruity, floral scent to products; it is generally considered safe at low concentrations but offers no skincare benefits.
Irritation
low
Source
synthetic
Heptyl Formate is a synthetic fragrance ingredient that adds a fruity, floral scent to products, but it offers no skincare benefits and may cause sensitivity in some individuals.
Irritation
low
Source
synthetic
A gentle, biodegradable surfactant that effectively cleanses without stripping the skin's natural moisture barrier.
Irritation
low
Source
natural
Heptyl Methacrylate is a synthetic film-forming ingredient that helps create durable, glossy coatings in nail products, but it may cause skin irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
A lightweight, non-greasy emollient that softens skin and improves product feel without clogging pores.
Irritation
low
Source
synthetic