Precision peptide serum that smooths expression lines & refines texture
The AUTEUR Definitive Line Serum is a next-generation peptide treatment designed to reduce visible expression lines and improve skin firmness. Combining neurotransmitter-inhibiting peptides like SYN®-AKE with Gold Pro-Collagen Peptide, it helps relax micro-tension while stimulating collagen renewal for smoother, stronger skin. Liquid Oxygen technology enhances cellular energy and repair, while Ergothioneine and Niacinamide defend against oxidative stress. The lightweight, silky texture absorbs quickly, making it ideal for daily use under moisturizer or SPF.
Engineered in Germany within AUTEUR’s “Definitive” collection, this serum focuses on precision line correction and rejuvenation. Regular use helps visibly soften crow’s-feet, forehead creases, and nasolabial folds while boosting overall skin resilience. Bioactive peptides and antioxidants encourage a firmer, more even complexion without irritation or heaviness. Suitable for all skin types, especially those experiencing early signs of aging or dynamic expression lines.
- Who it’s best for: All skin types with fine lines or dynamic wrinkles seeking smoother, firmer texture
- What makes it different: Dual peptide complex with oxygen technology for targeted smoothing and long-term collagen support
Due to manufacturer updates, packaging may vary from the image shown. Please note the product formulation remains the same.
Benefits of AUTEUR Definitive Line Serum
- Visibly softens fine lines and dynamic wrinkles
- Improves firmness, elasticity, and smoothness
- Reinforces barrier strength and protects against oxidative stress
What you'll notice:
- Smoother, more refined skin surface
- Lines and wrinkles appear less pronounced
- Skin feels firmer and more resilient
Clinical Results:
- Wrinkle depth reduced by up to 55 % in 4 weeks (Gold Pro-Collagen Peptide in vivo test)
- Visible smoothing effect within 2 hours of application (SYN®-AKE brand data)
Based on manufacturer-conducted in-vivo tests of Gold Pro-Collagen Peptide and SYN®-AKE dipeptide complexes.
How To Use AUTEUR Definitive Line Serum
- Apply 1–2 pumps to clean, dry skin morning and evening after cleansing.
- Focus on areas with visible expression lines (forehead, mouth, and eye area — avoiding direct contact with eyes).
- Allow to absorb fully before applying moisturizer or SPF.
Pro Tip (from estheticians): For maximum line-smoothing, press into skin using gentle upward motions and apply twice daily for visible results within weeks.
AUTEUR Definitive Line Serum Ingredients
CLINICALLY TESTED / KEY INGREDIENTS
SYN®-AKE Dipeptide: Mimics temple viper peptide to relax facial muscles and reduce dynamic wrinkles without irritation.
Gold Pro-Collagen Peptide: Stimulates collagen I & III synthesis for firmer, denser skin structure.
Liquid Oxygen (Perfluorocarbon Complex): Improves oxygen delivery and cellular metabolism for revitalized tone.
Niacinamide: Brightens, balances oil production, and strengthens barrier function.
Ergothioneine: Antioxidant amino acid that protects against UV-induced and environmental stress.
Hyaluronic Acid Complex: Provides multi-depth hydration and skin plumping benefits.
INGREDIENTS
Aqua/Water, Pentylene Glycol, Perfluorohexane, Squalane, Niacinamide, Glycerin, Perfluorodecalin, Pentafluoropropane, Hydrolyzed Soy Protein, Sodium Hyaluronate, Ergothioneine, Lecithin, Tocopherol, Disodium Adenosine Triphosphate, Panthenol, Acetyl Hexapeptide-8, Dipeptide Diatminobutyroyl Benzylamide Diacetate, Palmitoyl Tripeptide-5, Acetyl Heptapeptide-9, Colloidal Gold, Ethylhexylglycerin, Citric Acid, Caprylyl Glycol, Sodium Citrate, Xanthan Gum
Skin Elite is dedicated to maintaining the accuracy of the ingredient lists on this website. However, because ingredients are subject to change, we cannot guarantee that these lists are complete, up-to-date and/or error-free. For an accurate listing of ingredients in each product, please refer to your product packaging.
FAQs
Can I use this while pregnant or nursing?
The brand does not offer specific guidance; consult your physician before use.
Can I use this with retinol or acid products?
Yes — it pairs well with actives; apply this first and allow to absorb before moisturizer or retinoid.
Is it suitable for sensitive skin?
Yes, though introduce gradually if skin is reactive; peptides are gentle and non-acidic.
How long until I see results?
Visible softening of lines within days to weeks; firmness improves with continued use.
Can I use it around the eyes?
Apply on crow’s-feet and expression lines, avoiding direct contact with eyes.
People Also Ask
Is AUTEUR Definitive Line Serum good for wrinkles?
Yes — it’s formulated to target expression lines and static wrinkles with precision peptides and oxygen technology.
Can you use AUTEUR Definitive Line Serum every day?
Yes, AM and PM use is recommended for best results.
Does AUTEUR Definitive Line Serum work under makeup?
Yes — it absorbs instantly and creates a smooth, hydrated base for makeup application.
Is AUTEUR Definitive Line Serum fragrance-free / oil-free?
Formulated without added fragrance; contains biocompatible oils (squalane) for hydration and comfort.
Returns policy
Our goal at Skin Elite is to have happy and satisfied customers. If, after receipt, you are not completely satisfied with your order, you may initiate a return request in your account or by contacting our Customer Service team within 30 days of the purchase date at 1-888-400-4472 or at customerservices@skinelite.com.
If you wish to return an item, please ensure you obtain a return merchandise authorization number (RMA #). Return shipping costs are the responsibility of the customer unless there was a shipping error or damage. Please note original paid shipping fees are non-refundable. Returned items must be unopened and in their original packaging.
If you are an Elite Rewards Member just go to the Orders section within your Account and click on ‘Return Item’ and follow the instructions.
Please allow up to 2 weeks, from receipt of item(s), for refunds and store credits to be processed. Skin Elite reserves the right to reject any return and to change or update this return policy at any time. For more details, go to our Returns Policy page.
Shipping & Insurance
We proudly offer free shipping on orders $50 or more, after discounts, using either the United States Postal Services (USPS) First Class or Priority Mail and UPS Ground within the United States. Expedited UPS and FedEx delivery services are available at an additional cost to the 48 contiguous States only. Please note that a few of our products are restricted to ground shipping only and some orders may require a signature upon delivery.
Most orders are delivered within 3-7 days. However delivery times can also depend on external factors as well as internal USPS, UPS or FedEx factors and therefore cannot be guaranteed. Please note there may be some shipping delays during the busy Holiday Season. If you have not received your order within 14 days after your shipping confirmation, then please contact us immediately at customerservices@skinelite.com.
Please make sure to enter your shipping address correctly before you place your order. If the address is incomplete, it may delay receipt of the package.
Once your order is processed, you will receive an email notification with tracking information.
For more details, go to our Shipping Policy page.
Refused Packages and Incorrect Addresses
Please ensure your shipping address is entered correctly before your order is placed. If the address is incomplete, it may delay receipt of the package and you will be charged a $15 fee if delivery is refused or undeliverable. This often happens when the apartment or suite number is missing.
How Long Will Delivery Take?
All delivery methods can experience a range of delivery times. Most orders are delivered within 3-7 business days. However, delivery times can also depend on external factors as well as internal UPS / USPS / FedEx factors and therefore cannot be guaranteed. If you are in Hawaii, Alaska or a non-contiguous State, shipments will take up to 14 business days for delivery. Please note we must be contacted at customerservices@skinelite.com within 21 days of shipping notification to address shipping issues.
All orders are processed and shipped within 1 to 2 business days of order receipt. You will receive an automated email notification containing your tracking number as soon as a shipping label is created. Business days are Monday through Friday, excluding holidays.
Cut off time for Expedited, Express 2 day, and Next Day shipping options is 2pm ET. We cannot ship to PO boxes for Expedited, Express 2 Day, and Next Day Shipping. Please note Expedited, Express 2 Day and Next Day shipping is available to the 48 contiguous States only.
All deliveries are tracked with delivery confirmation provided. Insurance of packages is effective up to delivery confirmation only. Once items are confirmed as delivered, packages become the responsibility of the customer. Packages tracked as delivered, but reported missing, will need a UPS / USPS/ FedEx claim number to be investigated.
All delivery estimates are in business days excluding holidays. Skin Elite Group LLC is not responsible for carrier delays or delays due to events outside our control.