Pro Clinical Density Defend Diamax Advanced Hair Thickening Serum

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 Alcohol Denat. · ALCOHOL DENAT
  General function

  Fast-drying alcohol used to make sprays set quickly. In leave-on products it can leave hair feeling dry, especially in high position on the list.

  Leading ingredient

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

  May suitFine or easily flattened hair

  Evaporates on contact, which is how a spray sets almost instantly and leaves no weight behind it.

  May not suitDry, coarse, or high-porosity hair

  Porous hair gives water up easily as it is; a fast-evaporating solvent high on the list accelerates that.

  May not suitVery dry or highly damaged hair

  It evaporates quickly and takes some water with it. On hair already short of moisture, a formula built on a lot of it can finish drier than it started.

  PubChem
  • drying alcohol
  • solvent
• 2 Water · AQUA/WATER/ 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
• 3 Niacinamide
  General function

  Vitamin B3, used in scalp products for conditioning claims.

  Leading ingredient

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

  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.

  PubChem
  • vitamin
  • conditioning agent
• 4 Peg/Ppg-20/23 Dimethicone
  General function

  An ethoxylated or propoxylated formulation aid. Ingredients of this family keep oils, silicones and fragrance evenly dispersed in a water-based product.

  Supporting ingredient

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

  • emulsifier
  • silicone
  • water-soluble silicone
• 5 Caffeine
  General function

  Included in scalp and thickening products for label appeal. Evidence for applied caffeine changing hair growth is limited.

  Supporting ingredient

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

  PubChem
  • active
• 6 Acrylates/C10-30 Alkyl Acrylate Crosspolymer
  General function

  A gel-forming thickener that also keeps oils suspended. It contributes a little hold.

  Supporting ingredient

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

  May suitClimate-sensitive or frizz-prone hair

  A set polymer film is a physical barrier to humidity, so a style keeps its shape longer in damp conditions.

  May suitMaximum-hold styling

  Synthetic film formers dry into a continuous film, which is what holds a shape against movement and against humid air.

  DependsBuild-up-sensitive routines

  Some acrylate copolymers rinse with water and some need a detergent; the label alone does not say which one a formula used.

  • thickener
  • polymer
  • film former
• ▾Below about here, the order stops meaning much. These are usually used at 1% or less.
• 7 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
• 8 Glycerin
  General function

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

  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 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
• 9 TETRAHYDROXYPROPYL ETHYLENEDIAMINE
• 10 Mentha Arvensis Leaf Oil
  General function

  Cornmint oil, used for a cooling sensation and mint scent.

  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
  • botanical extract
• 11 Mentha Piperita (Peppermint) Oil
  General function

  Peppermint essential oil, used for scent and the cooling feeling on the scalp.

  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

  Essential oils are fragrance. Several carry constituents on the EU list of declared fragrance allergens, so a label with no fragrance line can still be a scented product.

  • botanical extract
  • essential oil
  • fragrance
• 12 PEG-30 DIPOLYHYDROXYSTEARATE
• 13 Benzyl Salicylate
  General function

  A soft floral fragrance component listed 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
• 14 Hexyl 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
• 15 Trideceth-6
  • emulsifier
  • solubilizer
• 16 Alpha-Isomethyl Ionone
  General function

  A violet-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
• 17 Limonene
  General function

  A citrus-smelling fragrance component that EU rules require to be named separately 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.

  PubChem
  • fragrance
  • named fragrance allergen
• 18 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
• 19 Citronellol
  General function

  A rose-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

What the whole list adds up to

• 9 fragrances
• 6 named fragrance allergens
• 2 solvents
• 2 emulsifiers
• 2 botanical extracts
• 1 drying alcohol
• 1 vitamin
• 1 conditioning agent
• 1 silicone
• 1 water-soluble silicone
• 1 active
• 1 thickener
• 1 polymer
• 1 film former

Ingredient list captured 2026-09-11. Formulas change, so check the package in your hand when an ingredient matters to you.