PROTEIN
SR-Spider Polypeptide-1
- protein
A bioengineered protein modelled on spider silk, used for a smooth, strong-feeling film.
- products in our library
- 11
- of researched products
- 0.3%
- on the label, in our conditioners
- usually #12
- most common in
- Conditioner
- in water
- Water-soluble
At a glance
Four named levels, read from this ingredient’s chemical class, its charge, its solubility, or where it sits on the labels we have. More dots means more of the property named — never “better”.
How much of it is left on hair between washes.
What it takes to get it off the hair again.
Smaller fragments travel further into the strand.
Read from where it sits on the labels we have, not from the molecule.
| Property | Level | Out of |
|---|---|---|
| Buildup risk | Low | 1 of 5 |
| Rinse-out behaviour | Rinses clean | 5 of 5 |
| Fragment size | Large | 4 of 5 |
| Stiffening potential | Slight | 2 of 5 |
What it does for a formula
What SR-Spider Polypeptide-1 does
The general function first, then how the role changes by product type where we have researched it.
Sticks to damaged areas of the surface and temporarily firms them.
Welcome on limp or damaged hair, unwelcome on hair that already feels rigid.
The film is what holds a shape once the water has gone.
How firmly depends on the polymer class and how much of it is used.
Charge
Charge is not recorded for this ingredient.
Solubility
Rinses out with water alone — it does not accumulate on hair between washes.
Where it appears
Where it appears
One row per product category in our library: how many products list it, what share of that category that is, and where it typically sits on the label.
| Product type | How common | Typical position on label ? |
|---|---|---|
Conditioner
3 products
|
secondary · #12 | |
Leave-in
3 products
|
supporting · #7 | |
Shampoo
3 products
|
secondary · #10 | |
Scalp treatment
2 products
|
secondary · #15 | |
Finisher: serum
1 product
|
supporting · #6 |
| Product type | Products | Share of category | Median position | Earliest position | Band |
|---|---|---|---|---|---|
| Conditioner | 3 | 0% | 12 | 7 | secondary |
| Leave-in | 3 | 1% | 7 | 5 | supporting |
| Shampoo | 3 | 0% | 10 | 7 | secondary |
| Scalp treatment | 2 | 1% | 15 | 9 | secondary |
| Finisher: serum | 1 | 1% | 6 | 6 | supporting |
No product-type differences have been researched yet — the reading below is computed from where it sits on the labels in our library.
Position footprint
Every listing in our library, by position on the label.
| Positions | Zone | Listings |
|---|---|---|
| 1-3 | Leading | 0 |
| 4-8 | Supporting | 5 |
| 9-15 | Secondary | 4 |
| 16-25 | Lower | 2 |
| 26+ | Trace | 1 |
How to read this
US labelling rules put ingredients above 1% in descending order of amount; below 1% they may be listed in any order.
So position tells you about relative amount only above that line, and we never convert a position into a percentage.
Who should pay attention
Conditional formulation guidance, scoped to a hair condition and to the positions where it is meaningful. It is not a conclusion about any finished product, and not a conclusion about you.
Film formers are what hold a style: they dry into a connected film across the strands so the shape resists movement.
How rigid the finish is depends on which polymer it is and what the formula pairs with it, not on there being one.
Unhydrolysed protein is too large to enter the strand. It sits on the surface, which is a coating effect rather than internal reinforcement.
A large surface-depositing protein. If protein reliably makes your hair feel rigid, this is the form most likely to do it.
Read where it is listed in the first three ingredients or positions 4–8.Read from this ingredient’s chemical class. Where we have researched the ingredient itself, that reading replaces the class one.
Why it matters to shoppers
What this ingredient is evidence of, what it is not evidence of, and what our own method can and cannot tell you.
- temporary strength on damaged hair
- a style that holds
- a rinse-clean feel
- hold that does not drop
- an exact safety score — we do not publish one, for any ingredient
- how a finished product performs by itself — that is the whole formula, not one line of it
- the exact percentage in a bottle — label position never converts into a number
- a secondary protein, listed below the main ingredients in our conditioners
- it was on the label of every product we counted — we read printed ingredient lists, not marketing copy
- stiffness — only how much of it there is does that
- that a product is right or wrong for you
We do not publish safety scores or hazard grades. Where a regulator has published a restriction or a use condition, we state it and cite it; otherwise we describe what the ingredient does and stop.
Commonly paired with
Ingredients that appear alongside this one most often in our library. Near-universal ingredients are excluded — they pair with everything and tell you nothing.
- 1,2-Hexanediol · 7
- Tetrasodium Glutamate Diacetate · 7
- Caprylyl Glycol · 7
- Polyquaternium-73 · 6
- Adansonia Digitata (Baobab) Seed Oil · 6
- Propanediol · 6
- Sodium Hydroxide · 6
- Guar Hydroxypropyltrimonium Chloride · 6
- Cetrimonium Chloride · 6
- Phosphatidylcholine · 5
The number beside a name is how many products in our library list both.
These ingredients tend to appear together to carry the formula and let it dry, keep the formula stable, and hold on to water.
Found in these products
The most prominent placements first. The badge is the position on that product’s own ingredient list.
Vegamour · Leave-in
HYDR-8 Leave-In Conditioner
#5 on the label · $6.80/oz
IGK · Finisher
Cash In Instant Repair Serum
#6 on the label · $21.18/oz
IGK Hair · Conditioner
Pay Day Conditioner
#7 on the label · $4.00/oz
Vegamour · Shampoo
HYDR-8 Hydrate and Repair Shampoo
#7 on the label
IGK · Leave-in
Best Interest Deep Repair Air Dry Styler
#9 on the label
Monpure · Scalp treatment
Nourish and Stimulate Scalp Mask
#9 on the label · $21.71/oz
IGK Hair · Shampoo
Pay Day Shampoo
#10 on the label · $4.00/oz
Vegamour · Conditioner
HYDR-8 Hydrate and Repair Conditioner
#12 on the label
Vegamour · Shampoo
GRO Revitalizing Shampoo
#19 on the label · $1.97/oz
Vegamour · Scalp treatment
GRO Scalp Detoxifying Serum
#21 on the label
Vegamour · Conditioner
GRO Revitalizing Conditioner
#26 on the label · $5.63/oz
Identity
What this entry is, and what our references call it.
No public-domain structure depiction is available for this entry.
SR-Spider Polypeptide-1
- film former
- sr-(spider polypeptide-1 oligopeptide-178)
- sr-spider polypeptide-1
For your hair?
Whether SR-Spider Polypeptide-1 matters for your hair depends on your hair.
11 products in our library list itWhat this ingredient does, and where it sits on the labels we have researched.
A verdict on any product that contains it, and never a safety grade.
We do not physically test your hair. Everything above is read from the ingredient lists in our library and from published references — the consultation is what turns it into a plan.
References
Seed entry — sourcing in progress Written from our reference work; primary sourcing is still being attached.
No published source is attached to this entry yet.
How this page was made
- Every number above is counted from the ingredient lists in our own product library — 11 of 3889 researched products list this ingredient. Nothing on this page is written per ingredient.
- The dots are named levels read from an ingredient’s chemical class, charge, solubility, or where it sits on the labels we have — never a score.
- US labelling rules put ingredients above 1% in descending order of amount; below 1% they may be listed in any order. Position tells you about relative amount only above that line, and we never convert a position into a percentage.
- The prominence bands (leading, supporting, secondary) are the same ones the product pages use to read a single label, applied here to the median position across a category.
- We do not publish safety scores or hazard grades. Where a regulator has published a restriction or a use condition, we state it and cite it; otherwise we describe what the ingredient does and stop.
- Identifiers and references appear only when a published source is attached to this entry; where none is, the row is simply absent rather than filled in.
- This is cosmetic information, not medical advice, and nothing here diagnoses or treats a health condition.
- Entry last updated 2026-08-28. Product-page methodology: the product library.