Caffeine Shampoo Bar with Tea Tree Oil – Growth & Scalp Care

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 Cocos Nucifera (Coconut) Oil · Coconut Oil
  General function

  One of the few oils small enough to move into the strand, which is why it is used for pre-wash treatments. It can feel heavy or stiff on protein-sensitive hair.

  Leading ingredient

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

  May suitDry, coarse, or high-porosity hair

  Because it penetrates rather than sits on top, it works on hair that loses water through a worn cuticle instead of only slowing evaporation from the surface the way a non-penetrating oil does.

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

  A thin oil layer lowers friction between strands and flattens the raised cuticle that scatters light and catches on its neighbours.

  May suitVery dry or highly damaged hair

  The exception to the class read: lauric acid is small and linear enough to enter the shaft rather than only coat it, and in comparison testing coconut oil was the one that reduced protein loss from washing on both undamaged and damaged hair.

  International Journal of Trichology
  • oil
  • emollient
• 2 Olea Europaea (Olive) Fruit Oil · Olive Oil
  General function

  A heavy, coating oil traditionally used for deep conditioning.

  Leading ingredient

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

  May suitDry, coarse, or high-porosity hair

  Coats the surface and slows water leaving the strand, which is usually what coarse hair that dries out fast is missing.

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

  A thin oil layer lowers friction between strands and flattens the raised cuticle that scatters light and catches on its neighbours.

  May not suitFine or easily flattened hair

  Near the top of a list an oil is weight before it is anything else, and fine hair shows that first at the roots.

  • oil
  • emollient
• 3 Ricinus Communis (Castor) Seed Oil · Castor Oil
  General function

  A thick, tacky oil used for sealing ends and for slick, held-down styles.

  Leading ingredient

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

  May suitDry, coarse, or high-porosity hair

  Coats the surface and slows water leaving the strand, which is usually what coarse hair that dries out fast is missing.

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

  A thin oil layer lowers friction between strands and flattens the raised cuticle that scatters light and catches on its neighbours.

  May not suitFine or easily flattened hair

  Near the top of a list an oil is weight before it is anything else, and fine hair shows that first at the roots.

  • oil
  • emollient
• 4 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
• ▾Below about here, the order stops meaning much. These are usually used at 1% or less.
• 5 Melaleuca Alternifolia (Tea Tree) Leaf Oil · Tea Tree Essential Oil
  General function

  Tea tree essential oil, used in scalp products for its sharp scent and traditional clarifying reputation.

  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
• 6 Panthenol · Panthenol (Pro-Vitamin B5)
  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.

  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 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
• 7 Aloe Barbadensis Leaf Juice · Aloe Vera
  General function

  Aloe gel, used for light moisture and slip. High in the list it also contributes a little natural hold.

  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 suitCurls or waves needing flexible hold

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

  May suitFine or easily flattened hair

  Hydration with no oil attached, so it adds very little weight even high on a list.

  May suitVery dry or highly damaged hair

  Aloe is mostly water carrying sugars that bind more of it, which is why it turns up as the base of moisture-first formulas.

  • humectant
  • botanical extract
  • gum
• 8 Natural Clays

What the whole list adds up to

• 3 oils
• 3 emollients
• 2 botanical extracts
• 2 humectants
• 1 active
• 1 essential oil
• 1 fragrance
• 1 conditioning agent
• 1 vitamin
• 1 gum

Ingredient list captured 2026-10-17. Formulas change, so check the package in your hand when an ingredient matters to you.