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Tryptophan

Tryptophan leaves hair feeling smoother and easier to manage, and also is listed in CosIng as an antistatic agent (static control, mostly in hair products), and adds scent.

ReferenceCatalog-linked

Find formulas with this

Decision snapshot

Current record

In our catalog: Found in 39 of the 7,133 products we've decoded
Label position: Typically #49 of a label (bottom third) — across 39 decoded labelsLabels list ingredients in descending order only above 1% — position is a rough signal, not a concentration claim.

Names & references

Official label names and chemical registry identifiers, with each available source kept explicit.

Official INCI name: Tryptophan
Korean · KCIA: 트립토판

Chemical registries

CAS54-12-6 / 73-22-3EC200-194-9 / 200-795-6PubChem1148

Recent research

All research on Tryptophan →

Tracking 13 published papers (2025-2026).

Fecal tryptophan metabolism predicts the development of infant eczema: a prospective longitudinal study.
Gut microbes, 2026
Oral probiotics and topical secretome to enhance clinical outcomes and microbiome restoration in acne vulgaris: a double-blind, randomised controlled trial protocol.
BMJ open, 2026, cited 0× (OpenAlex)
Tryptophan Metabolism at the Crossroads of Immunity, Barrier Function, and the Microbiome in Atopic Dermatitis.
Clinical reviews in allergy & immunology, 2026, cited 0× (OpenAlex)

Where it fits in real formulas

Related ingredients, common formula neighbors, naming, and catalog context. This stays separate from evidence and personal-fit guidance.

Similar ingredients

related by documented function or concern

Pro-vitamin B5Moisturizes and improves hydration by drawing and holding water in the skin BHA exfoliantPromotes shedding of surface scale through keratolytic action Hydrolyzed Wheat ProteinConditions and adds body, so hair feels thicker Hydrolyzed KeratinConditions hair and smooths a damaged, rough cuticle Ceramide NpHelps replenish surface lipids within an appropriately formulated moisturizer Hyaluronic AcidBinds water at the skin surface and supports short-term hydration. The widely repeated claim that it holds 1,000 times its weight in water is not supported by direct measurement. A 2025 review reported about 0.7–2 grams of water per gram of polysaccharide.

Where it's used

Real brands and product categories from the 39 decoded products listing Tryptophan — an observation of our catalog, not a claim about market share.

Brands

Medi-peel (7)Laneige (4)Filorga (3)Moev (3)COSRX (2)medicube (2)Cell Fusion C (1)Daleaf (1)

Product categories

exfoliants (9), moisturizers (7), shampoos (6), masks (4), stylings (3), serums (3)

Commonly appears alongside

How often another ingredient appears in the same decoded products. This does not show routine compatibility.

Hydrolyzed Keratin23%9 of 39 decoded products Urea13%5 of 39 decoded products Sodium Ascorbyl Phosphate18%7 of 39 decoded products Hydrolyzed Wheat Protein10%4 of 39 decoded products Caffeine15%6 of 39 decoded products Tranexamic Acid8%3 of 39 decoded products Argan oil13%5 of 39 decoded products Vitamin C15%6 of 39 decoded products Vitamin B364%25 of 39 decoded products

Frequently asked questions

What does Tryptophan do in a formula?

Tryptophan's CosIng-listed function is "hair conditioning": leaves hair feeling smoother and easier to manage.

How common is Tryptophan in skincare?

Tryptophan appears in 1% of the 7,133 decoded products in our catalog (39 products).

Which brands use Tryptophan?

In the products we've decoded, Tryptophan appears in formulas from Medi-peel, Laneige, Filorga, Moev, COSRX.

What kinds of products contain Tryptophan?

In our decoded catalog, Tryptophan shows up mostly in exfoliants (9), moisturizers (7), shampoos (6), masks (4), stylings (3), serums (3).

What is Tryptophan called in Korean?

On Korean labels, Tryptophan is listed as 트립토판.

Where does Tryptophan usually appear on the ingredient list?

Typically #49 of a label (bottom third) — across 39 decoded labels. Labels list ingredients in descending order only above 1% — position is a rough signal, not a concentration claim.

Products with Tryptophan

All 38 →

38 public products list this ingredient.

Catalog preview

A compact look at the first products in this result set

1–1 / 12

Browse full product list

About the sources

Ingredient lists show presence and order, not concentration, pH, ingredient grade, delivery system, or finished-formula performance.

Sources & methodology

Compiled from the EU CosIng database (ref 38801) · snapshot 16 June 2026. CosIng is an informational, non-legally-binding reference. Inclusion does not mean an ingredient is approved, safe, authorized for cosmetic use, or clinically effective. An INCI list does not reveal concentration, pH, ingredient grade, delivery system, or finished-formula performance.

All ingredients & pairings

Tryptophan

Tryptophan leaves hair feeling smoother and easier to manage, and also is listed in CosIng as an antistatic agent (static control, mostly in hair products), and adds scent.

ReferenceCatalog-linked

Find formulas with this

Decision snapshot

Current record

In our catalog: Found in 39 of the 7,133 products we've decoded
Label position: Typically #49 of a label (bottom third) — across 39 decoded labelsLabels list ingredients in descending order only above 1% — position is a rough signal, not a concentration claim.

Names & references

Official label names and chemical registry identifiers, with each available source kept explicit.

Official INCI name: Tryptophan
Korean · KCIA: 트립토판

Chemical registries

CAS54-12-6 / 73-22-3EC200-194-9 / 200-795-6PubChem1148

Recent research

All research on Tryptophan →

Tracking 13 published papers (2025-2026).

Fecal tryptophan metabolism predicts the development of infant eczema: a prospective longitudinal study.
Gut microbes, 2026
Oral probiotics and topical secretome to enhance clinical outcomes and microbiome restoration in acne vulgaris: a double-blind, randomised controlled trial protocol.
BMJ open, 2026, cited 0× (OpenAlex)
Tryptophan Metabolism at the Crossroads of Immunity, Barrier Function, and the Microbiome in Atopic Dermatitis.
Clinical reviews in allergy & immunology, 2026, cited 0× (OpenAlex)

Where it fits in real formulas

Related ingredients, common formula neighbors, naming, and catalog context. This stays separate from evidence and personal-fit guidance.

Similar ingredients

related by documented function or concern

Where it's used

Real brands and product categories from the 39 decoded products listing Tryptophan — an observation of our catalog, not a claim about market share.

Brands

Medi-peel (7)Laneige (4)Filorga (3)Moev (3)COSRX (2)medicube (2)Cell Fusion C (1)Daleaf (1)

Product categories

exfoliants (9), moisturizers (7), shampoos (6), masks (4), stylings (3), serums (3)

Commonly appears alongside

How often another ingredient appears in the same decoded products. This does not show routine compatibility.

Frequently asked questions

What does Tryptophan do in a formula?

Tryptophan's CosIng-listed function is "hair conditioning": leaves hair feeling smoother and easier to manage.

How common is Tryptophan in skincare?

Tryptophan appears in 1% of the 7,133 decoded products in our catalog (39 products).

Which brands use Tryptophan?

In the products we've decoded, Tryptophan appears in formulas from Medi-peel, Laneige, Filorga, Moev, COSRX.

What kinds of products contain Tryptophan?

In our decoded catalog, Tryptophan shows up mostly in exfoliants (9), moisturizers (7), shampoos (6), masks (4), stylings (3), serums (3).

What is Tryptophan called in Korean?

On Korean labels, Tryptophan is listed as 트립토판.

Where does Tryptophan usually appear on the ingredient list?

Typically #49 of a label (bottom third) — across 39 decoded labels. Labels list ingredients in descending order only above 1% — position is a rough signal, not a concentration claim.

Products with Tryptophan

All 38 →

38 public products list this ingredient.

Catalog preview

A compact look at the first products in this result set

1–1 / 12

Browse full product list

About the sources

Ingredient lists show presence and order, not concentration, pH, ingredient grade, delivery system, or finished-formula performance.

Sources & methodology

Your cookie choices

Decision snapshot

Names & references

Recent research

Where it fits in real formulas

Where it's used

Frequently asked questions

Products with Tryptophan

COSRX PEPTIDE-132 Ultra Perfect Hair Bonding Shampoo

COSRX Peptide-132 Ultra Perfect Hair Bonding Treatment 240ml

LANEIGE Balance Mode Peel-Off Mask 100ml

LANEIGE Cica Sleeping Mask 25ml

JUST AS I AM Deep Nourish Shampoo 380ml

epais Repair Leave-In Treatment 150ml

RNW DER. BLANC Shining Emulsion 125ml

[MEDI-PEEL] Phyto EX PDRN Lifting Shot Drop Gel Cream 50g

LANEIGE Bouncy & Firm Eye Sleeping Mask 20g

[Genabelle] PDRN Dual Glow Serum Mist 100ml

[medicube] Rosemary PDRN Hair & Scalp Conditioner 250ml

[medicube] Rosemary PDRN Cooling Thickening Shampoo 400ml

About the sources

Decision snapshot

Names & references

Recent research

Where it fits in real formulas

Where it's used

Frequently asked questions

Products with Tryptophan

COSRX PEPTIDE-132 Ultra Perfect Hair Bonding Shampoo

COSRX Peptide-132 Ultra Perfect Hair Bonding Treatment 240ml

LANEIGE Balance Mode Peel-Off Mask 100ml

LANEIGE Cica Sleeping Mask 25ml

JUST AS I AM Deep Nourish Shampoo 380ml

epais Repair Leave-In Treatment 150ml

RNW DER. BLANC Shining Emulsion 125ml

[MEDI-PEEL] Phyto EX PDRN Lifting Shot Drop Gel Cream 50g

LANEIGE Bouncy & Firm Eye Sleeping Mask 20g

[Genabelle] PDRN Dual Glow Serum Mist 100ml

[medicube] Rosemary PDRN Hair & Scalp Conditioner 250ml

[medicube] Rosemary PDRN Cooling Thickening Shampoo 400ml

About the sources