Heat Shield Curl Protector

In the US, ingredients above 1% are listed from most to least. Below 1% they can appear in any order. Each note keeps three things apart: what the ingredient generally does, its role in this type of product, and what its position can tell you.

• 1 Water · Water (Aqua/Eau)
  General function

  The base of almost every rinse-off and cream hair product. It carries everything else and is normally the first ingredient on the label.

  Leading ingredient

  Listed in the first three ingredients, it is likely a structural part of this formula.

  • solvent
• 2 Panthenol
  General function

  Provitamin B5. It draws in water and penetrates the strand a little, which is why it is the standard ingredient for softness and shine claims.

  Leading ingredient

  Listed in the first three ingredients, it is likely a structural part of this formula.

  May suitFine or easily flattened hair

  It hydrates without adding oil or a film, which is the combination fine hair usually needs.

  May suitFrizz-prone, damaged, or high-friction hair

  Deposits a lubricating layer that makes combing easier, which is most of what stops mechanical damage adding to frizz.

  May suitVery dry or highly damaged hair

  A humectant that also penetrates the cuticle, so it holds water inside the strand rather than only on the surface.

  PubChem
  • humectant
  • conditioning agent
  • vitamin
• 3 Oleyl Alcohol
  General function

  A liquid fatty alcohol that adds slip and helps other oils spread.

  Leading ingredient

  Listed in the first three ingredients, it is likely a structural part of this formula.

  May suitDry, coarse, or high-porosity hair

  The waxy solid that gives a conditioner its body. It deposits a soft lubricating layer, which is most of what makes hair feel smooth after rinsing.

  May suitFrizz-prone, damaged, or high-friction hair

  Deposits with the cationic conditioners and helps them lie flat along the strand, which is where the detangling actually comes from.

  DependsFine or easily flattened hair

  Near the top of a conditioner it is doing most of the conditioning, and most of the weighting, at the same time.

  PubChem
  • fatty alcohol
  • emollient
• 4 Oleth-20
  General function

  An emulsifier that keeps oils dispersed in water-based formulas.

  Supporting ingredient

  Listed in positions 4–8, it likely makes a meaningful contribution alongside the formula's main ingredients.

  • emulsifier
  • solubilizer
• 5 Silk Amino Acids
  General function

  Silk protein broken into amino acids, used for slip and shine rather than strength.

  Supporting ingredient

  Listed in positions 4–8, it likely makes a meaningful contribution alongside the formula's main ingredients.

  May suitVery dry or highly damaged hair

  Amino acids are the smallest protein fraction and bind water as well, so they add far less stiffness than a hydrolysed protein does.

  DependsProtein-sensitive hair

  The lightest option in the protein family, but still protein — worth watching if protein reliably stiffens your hair.

  • protein
  • amino acid
• 6 Glycerin
  General function

  Glycerin, also called glycerol, attracts moisture and mixes completely with water.

  Supporting ingredient

  Listed in positions 4–8, it likely makes a meaningful contribution alongside the formula's main ingredients.

  May suitDry, coarse, or high-porosity hair

  High-porosity hair loses water fast; a humectant holds some of it in place for longer than the wash itself would.

  May suitVery dry or highly damaged hair

  Binds water into the outer layers of the strand, and water is what makes dry hair flexible again rather than brittle.

  DependsClimate-sensitive or frizz-prone hair

  Water moves both ways. Measured across concentrations, glycerin solutions give water up in some conditions and take it from the air in others. What it does for you depends on how much of it is there and on the air around it.

  Scientific Reports
  • humectant
• 7 Propylene Glycol
  General function

  A small humectant and solvent that keeps formulas stable and helps active ingredients spread.

  Supporting ingredient

  Listed in positions 4–8, it likely makes a meaningful contribution alongside the formula's main ingredients.

  May suitFine or easily flattened hair

  Light and water-binding rather than oily, so it adds less weight than oils or butters do.

  May suitVery dry or highly damaged hair

  A small water-binding solvent. It holds moisture and helps the rest of the formula spread evenly over the strand.

  DependsClimate-sensitive or frizz-prone hair

  A humectant follows the air: it holds water in humid conditions and can give it up in very dry ones. Climate decides what it does more than the label does.

  PubChem
  • humectant
  • solvent
• 8 Equisetum Arvense (Horsetail) Leaf Extract · Equisetum Arvense Leaf Extract
  General function

  An extract from the leaf of Horsetail (Equisetum Arvense). Plant extracts are used across a wide range of levels, and label order is the best guide to how much is here.

  Supporting ingredient

  Listed in positions 4–8, it likely makes a meaningful contribution alongside the formula's main ingredients.

  • botanical extract
• 9 Avena Sativa (Oat) Straw Extract
• 10 Chamomilla Recutita (Matricaria) Flower Extract
  • botanical extract
• 11 Urtica Dioica (Nettle) Leaf Extract
  • botanical extract
• 12 Macrocystis Pyrifera (Kelp) Extract
  • botanical extract
• 13 Hydroxypropyl Guar
  General function

  A modified guar gum used to thicken and give a slippery, cushioned feel.

  Secondary ingredient

  Lower in the ordered portion of the list, it is more likely playing a supporting role than defining the formula.

  May suitCurls or waves needing flexible hold

  Gums thicken and set soft, which gives definition that bends rather than a rigid cast.

  May suitMaximum-hold styling

  A styling polymer dries into a film across the strands, which is what makes a shape hold instead of relax.

  • gum
  • thickener
  • polymer
• ▾Below about here, the order stops meaning much. These are usually used at 1% or less.
• 14 Fragrance · Parfum (Fragrance)
  General function

  An undisclosed blend of scent ingredients. Regulations let it stay unlisted, so a fragrance-free product is the only way to be certain what is not in it.

  Estimated lower-concentration zone

  It appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.

  May not suitFragrance-sensitive routines

  Declared fragrance. On a fragrance-sensitive routine this is the line that decides it, wherever it sits on the label.

  • fragrance
  • declared fragrance
• 15 Citric Acid
  General function

  Used to bring the product to a slightly acidic pH, which helps the cuticle lie flat. It is almost always near the end of the list.

  Estimated lower-concentration zone

  It appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.

  May suitBuild-up-sensitive routines

  Holds hard-water minerals in solution so they rinse away instead of depositing on the hair.

  May suitFrizz-prone, damaged, or high-friction hair

  The acid side of pH adjustment, and the reason it matters is measured: alkaline formulas raise the fibre's surface negative charge, increase friction between strands and lift the scales, while lower-pH ones do the reverse.

  May suitGray, silver, or brass-prone hair

  Where a warm cast comes from water minerals rather than from the hair itself, holding those metals in solution is what removes it.

  International Journal of Trichology
  • pH adjuster
  • hard-water chelator
• 16 DMDM Hydantoin
  • formaldehyde releaser
  • preservative
• 17 Potassium Sorbate
  • preservative
• 18 Sodium Chloride
  • salt
  • thickener
• 19 Benzoic Acid
  • preservative
• 20 Amyl Cinnamal
  General function

  A jasmine-like fragrance component named separately as a recognised allergen.

  Estimated lower-concentration zone

  It appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.

  May not suitFragrance-sensitive routines

  One of the 26 scent components the EU requires to be named individually above a threshold. It is named because it is a known contact allergen, not because it is unusual.

  PubChem
  • fragrance
  • named fragrance allergen
• 21 Geraniol
  General function

  A rose-scented fragrance component, listed on its own because some people react to it.

  Estimated lower-concentration zone

  It appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.

  May not suitFragrance-sensitive routines

  One of the 26 scent components the EU requires to be named individually above a threshold. It is named because it is a known contact allergen, not because it is unusual.

  • fragrance
  • named fragrance allergen
• 22 Linalool
  General function

  A floral fragrance component listed separately as a recognised contact allergen.

  Estimated lower-concentration zone

  It appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.

  May not suitFragrance-sensitive routines

  One of the 26 scent components the EU requires to be named individually above a threshold. It is named because it is a known contact allergen, not because it is unusual.

  PubChem
  • fragrance
  • named fragrance allergen

What the whole list adds up to

• 4 botanical extracts
• 4 fragrances
• 3 humectants
• 3 preservatives
• 3 named fragrance allergens
• 2 solvents
• 2 thickeners
• 1 conditioning agent
• 1 vitamin
• 1 fatty alcohol
• 1 emollient
• 1 emulsifier
• 1 solubilizer
• 1 protein

Ingredient list captured 2026-09-16. Formulas change, so check the package in your hand when an ingredient matters to you.