Ingredient review
Thioctoyl Dipeptide-36 Amide
INCI: THIOCTOYL DIPEPTIDE-36 AMIDE PEG-2 ETHYLAMINE
A lab-made peptide that may help improve skin firmness and reduce the look of fine lines, but research is still early.
In plain English
This ingredient is a synthetic peptide—a small chain of amino acids (the building blocks of proteins) that has been modified with a thioctoyl group (a derivative of alpha-lipoic acid, an antioxidant) and a PEG chain to help it absorb into skin. It's designed to signal skin cells to produce more collagen and elastin, which can make skin feel firmer and look smoother over time. Because it's a newer ingredient, most evidence comes from lab studies and small trials, not large human studies.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is still emerging, so marketing claims deserve extra caution.
Risk flags are low for most users, though the finished product can still irritate.
- Source
- synthetic
- Evidence
- emerging
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Thioctoyl Dipeptide-36 Amide is generally a lower-concern ingredient when the full formula suits your skin.
Plain-English read
Treat this as a practical screening step before you compare products that contain this ingredient.
- Step 1Start with the score, then check the irritation and clogging risk before judging Thioctoyl Dipeptide-36 Amide.
- Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
- Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.
Score terms in plain English
Irritation risk
lowLess likely to sting, burn, or bother most users, though sensitive skin can still react.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
emergingThe ingredient may be promising, but claims should be treated more cautiously.
What it is
Thioctoyl Dipeptide-36 Amide PEG-2 Ethylamine is a synthetic peptide ingredient. It combines a dipeptide (two amino acids linked together) with a thioctoyl group (related to the antioxidant alpha-lipoic acid) and a PEG-2 ethylamine tail to improve stability and skin penetration. It is not found in nature and is produced in a laboratory.
How it works
In a cosmetic product, this peptide is thought to mimic natural signaling molecules that tell skin cells to ramp up production of collagen and elastin—the proteins that keep skin firm and bouncy. The thioctoyl part may also provide some antioxidant activity, helping protect skin from environmental stress. When applied topically, the PEG chain helps the peptide penetrate the outer layer of skin so it can reach living cells.
Pros
Targeted anti-aging support
This peptide is designed to specifically signal collagen and elastin production, which can help improve skin firmness and smoothness over time.
Gentle for sensitive skin
With low irritation and comedogenic risk, it's a good option for those who react to stronger anti-aging ingredients like retinol.
Cons and cautions
Limited real-world proof
Most evidence comes from lab studies or small trials, so it's unclear how well it works for everyone in everyday use.
Premium price tag
Products containing this peptide tend to be more expensive due to the cost of synthetic peptide production.
Best for
- Adults looking to improve skin firmness and reduce early signs of aging
- People with normal to dry skin who want a gentle anti-aging option
Use caution if
- Those with known allergies to synthetic peptides or PEG compounds should patch test first
Usage tips
Safety summary
Thioctoyl Dipeptide-36 Amide PEG-2 Ethylamine is considered safe for topical use in cosmetics at typical concentrations. It has low irritation and comedogenic potential. However, as with any new ingredient, patch testing is recommended for those with very sensitive skin or allergies to peptides or PEG compounds.
Research notes
Research on this specific peptide is limited. It belongs to a class of signaling peptides that have shown promise in lab and small human studies for supporting collagen synthesis. Larger, independent clinical trials are needed to confirm its efficacy and compare it to more established anti-aging ingredients.
Common label clues
- Typical concentration
- Typically used at 0.1% to 2% in leave-on products
- Regulatory status
- Approved for use in cosmetics in the US, EU, and other major markets. No specific restrictions beyond general cosmetic safety requirements.
- Common uses
- Anti-aging serums, Firming creams, Eye treatments
- Environmental note
- As a synthetic ingredient, its environmental impact depends on manufacturing practices. PEG compounds can be persistent in the environment, but concentrations in rinse-off products are very low.
Good to know
- This ingredient is often listed near the middle or end of an ingredient list, indicating a lower concentration.
- It pairs well with other anti-aging ingredients like vitamin C or niacinamide, but avoid using with very low pH products that could break down the peptide.
Common questions
What is Thioctoyl Dipeptide-36 Amide in beauty products?
This ingredient is a synthetic peptide—a small chain of amino acids (the building blocks of proteins) that has been modified with a thioctoyl group (a derivative of alpha-lipoic acid, an antioxidant) and a PEG chain to help it absorb into skin. It's designed to signal skin cells to produce more collagen and elastin, which can make skin feel firmer and look smoother over time. Because it's a newer ingredient, most evidence comes from lab studies and small trials, not large human studies.
What does Thioctoyl Dipeptide-36 Amide do in a beauty product?
In a cosmetic product, this peptide is thought to mimic natural signaling molecules that tell skin cells to ramp up production of collagen and elastin—the proteins that keep skin firm and bouncy. The thioctoyl part may also provide some antioxidant activity, helping protect skin from environmental stress. When applied topically, the PEG chain helps the peptide penetrate the outer layer of skin so it can reach living cells.
Is Thioctoyl Dipeptide-36 Amide safe for most people?
Thioctoyl Dipeptide-36 Amide PEG-2 Ethylamine is considered safe for topical use in cosmetics at typical concentrations. It has low irritation and comedogenic potential. However, as with any new ingredient, patch testing is recommended for those with very sensitive skin or allergies to peptides or PEG compounds.
Who should be careful with Thioctoyl Dipeptide-36 Amide?
Those with known allergies to synthetic peptides or PEG compounds should patch test first
Research sources
Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.