How to Use Syn-Ake: Routine, Retinol, Peptides & Safety

Syn-Ake can be used as part of a morning or evening skincare routine, but the best application method depends on the finished product rather than the peptide name alone.

For Neurogan Health's Syn-Ake Peptide Face Cream, the current directions are to apply one pump in the morning and at night to clean skin, focusing on expression-line areas such as the forehead, between the brows, and around the outer eye area.

There is no strong clinical evidence showing that Syn-Ake must be used at a particular time of day or that it cannot be combined with retinol, GHK-Cu, or other cosmetic peptides. The more practical issue is how well your skin tolerates the complete routine.

This guide explains how to use Syn-Ake, how often to apply it, how to layer it with other skincare products, and when a simpler routine may be better.

How to Use Syn-Ake at a Glance

How Do You Use Syn-Ake?

Syn-Ake is a cosmetic ingredient rather than a standardized treatment, so there is no single universal application protocol for every Syn-Ake product.

The directions should come from the finished formulation.

For Neurogan Health's Syn-Ake Peptide Face Cream, the current recommended use is:

1. Cleanse and dry your skin.
2. Apply any lightweight serums you use first.
3. Apply one pump of Syn-Ake Peptide Face Cream.
4. Smooth it over expression-line areas.
5. Allow the cream to absorb.
6. In the morning, finish with sunscreen.

The current product directions specify use morning and night.

Where Should You Apply Syn-Ake?

Syn-Ake skincare is most commonly used on areas affected by repeated facial expression.

These include:

• horizontal forehead lines;
• lines between the eyebrows;
• crow's feet around the outer eye area; and
• other expression lines that become more visible when smiling, squinting, or raising the eyebrows.

Syn-Ake is primarily positioned around the appearance of expression lines rather than pigmentation, acne, or exfoliation.

Avoid direct contact with the eyes unless the specific product has been formulated and labeled for that use.

Should You Use Syn-Ake in the Morning or at Night?

There is no established clinical evidence showing that Syn-Ake works better in the morning or at night.

The ingredient itself does not have a known requirement for a particular time of day.

Instead, timing usually depends on:

• the finished formulation;
• the rest of your skincare routine;
• whether you are using potentially irritating actives at night; and
• how often the product manufacturer recommends application.

Neurogan's current Syn-Ake Face Cream directions call for one application in the morning and another at night.

Example Morning Routine

1. Gentle cleanser
2. Lightweight serum, if used
3. Syn-Ake Face Cream
4. Broad-spectrum sunscreen

Example Evening Routine

1. Cleanser
2. Lightweight treatment serum, if used
3. Syn-Ake Face Cream

If your evening routine also contains a retinoid or another potentially irritating active, introduce products gradually rather than changing several products at once.

How Often Should You Use Syn-Ake?

There is no universally established Syn-Ake application frequency.

Historical manufacturer research commonly evaluated twice-daily topical application over approximately four weeks. [1,2]

That does not mean every Syn-Ake formulation must be applied twice a day.

Always follow the instructions for the actual product.

For the Neurogan Health formula, the current directions are:

One pump, morning and night.

If you have sensitive skin or are adding several new active products to your routine, it can be easier to introduce them separately so that any irritation can be traced to the responsible product.

Should Syn-Ake Go Before or After Moisturizer?

The answer depends on whether Syn-Ake is delivered as a serum, gel, or cream.

A useful general rule for skincare layering is:

lighter products first → heavier creams later → sunscreen last in the morning.

Because Neurogan's Syn-Ake product is itself a face cream, it generally fits after lightweight serums rather than before them.

If you use another moisturizer as well, whether you need both depends on your skin type and how moisturizing the rest of the routine is.

Can You Use Syn-Ake With Retinol?

There is no established Syn-Ake-specific rule saying that Syn-Ake and retinol must be used separately.

The more important consideration is irritation.

Retinol and prescription retinoids can cause:

• dryness;
• redness;
• peeling;
• burning or stinging; and
• increased skin sensitivity in some users. [3]

If you already tolerate retinol well, adding a Syn-Ake cream does not automatically require stopping the retinol.

If your skin is sensitive, however, a simpler approach may be easier:

• use Syn-Ake in the morning and retinol at night;
• alternate retinol nights;
• introduce Syn-Ake only after your existing retinol routine is stable; or
• reduce the number of other potentially irritating products.

These strategies are primarily about skin tolerability, not because Syn-Ake and retinol are known to chemically cancel each other out.

Example Syn-Ake + Retinol Routine

Morning:

1. Cleanser
2. Syn-Ake Face Cream
3. Sunscreen

Evening:

1. Cleanser
2. Retinol or prescribed retinoid as directed
3. Moisturizer if needed

This is not the only possible routine, but separating the products can make it easier to judge tolerance.

Can You Use Syn-Ake With Copper Peptides?

There is no established clinical rule requiring Syn-Ake and cosmetic copper peptides such as GHK-Cu to be separated.

They are different peptides with different proposed functions.

Syn-Ake is primarily used for the appearance of expression lines, while GHK-Cu is a copper-binding peptide studied in relation to skin remodeling, extracellular-matrix biology, and repair processes.

Neurogan's current Syn-Ake Face Cream directions specifically suggest pairing it with the GHK-Cu Face & Neck Serum underneath the cream.

A simple layering order would therefore be:

1. Cleanse.
2. Apply GHK-Cu serum.
3. Allow it to absorb.
4. Apply Syn-Ake Face Cream.
5. Use sunscreen during the day.

There is not yet strong clinical evidence showing that combining GHK-Cu with Syn-Ake produces greater wrinkle improvement than either ingredient used separately.

Can You Use Syn-Ake With Other Peptides?

Yes, cosmetic products frequently combine multiple peptides.

There is direct evidence that Syn-Ake can be formulated alongside another expression-line peptide.

A 2026 human study evaluated a serum containing both:

• Dipeptide Diaminobutyroyl Benzylamide Diacetate, the active INCI ingredient associated with Syn-Ake; and
• Acetyl Hexapeptide-8, commonly known as Argireline. [4]

The formulation also contained gluconolactone, niacinamide, and Laminaria extract.

The serum improved several measures of static and dynamic wrinkles during clinical testing. [4]

However, because multiple ingredients were used together, the study does not establish that combining the two peptides is synergistic or superior to using either one alone.

Can You Use Syn-Ake With Argireline?

There is no established requirement to separate them.

In fact, the 2026 clinical formulation above included both ingredients in the same serum. [4]

Syn-Ake and Argireline are often grouped together because both are marketed toward expression lines, but their proposed mechanisms are different.

We therefore consider them complementary cosmetic concepts rather than interchangeable versions of the same peptide.

Can You Use Syn-Ake With Matrixyl?

There is no general clinical rule saying Syn-Ake and Matrixyl peptides cannot be used in the same routine.

They target different aspects of cosmetic skin aging.

Matrixyl peptides are typically categorized as signal peptides associated with extracellular-matrix support, while Syn-Ake is positioned around expression-line appearance.

For more background, see our guide to Matrixyl and copper peptides.

Can You Use Syn-Ake With Vitamin C?

There is not enough Syn-Ake-specific clinical evidence to create a universal rule requiring separation from vitamin C.

The practical question is again the complete formulation.

Some vitamin C products are acidic or can be irritating, especially when combined with multiple other active products.

If a routine containing several actives causes redness, burning, or persistent irritation, simplify the routine rather than assuming that more ingredients will produce better results.

Can You Use Syn-Ake With Exfoliating Acids?

No strong Syn-Ake-specific evidence establishes that alpha-hydroxy acids or beta-hydroxy acids chemically deactivate Syn-Ake in normal skincare use.

However, exfoliating acids themselves can irritate the skin, particularly when layered with other strong actives.

If irritation develops, use fewer active products at the same time or alternate them between routines.

Can You Use Syn-Ake Around the Eyes?

Syn-Ake is commonly used in products intended for crow's-feet and outer-eye expression lines.

But the skin around the eyes is sensitive, and the finished product's instructions matter.

For Neurogan's Face Cream, apply around the outer eye area rather than directly into the eyes.

If a product causes burning, persistent redness, swelling, or eye irritation, discontinue application to that area.

How Much Syn-Ake Should You Apply?

There is no useful universal answer in milligrams because Syn-Ake is incorporated into finished cosmetic formulations at different concentrations.

Consumers should follow the serving or application directions for the actual product rather than trying to calculate a dose of pure peptide.

Neurogan's Syn-Ake Peptide Face Cream currently contains 1,000 mg of Syn-Ake ingredient per 50 mL container, with instructions to use one pump per application.

Using substantially more cream does not mean that the product will work faster or produce proportionally greater results.

How Long Should You Use Syn-Ake?

Syn-Ake is a cosmetic skincare ingredient rather than a short treatment course.

Most published and manufacturer testing has evaluated repeated use over weeks rather than one or two applications.

An older review summarized manufacturer research using Syn-Ake twice daily for 28 days. [2]

More recently, a multi-active serum containing Syn-Ake was studied over a longer period and produced changes in wrinkle and skin-quality measurements. [4]

These studies should not be interpreted as guaranteeing that every product will produce visible results after a fixed number of weeks.

How Long Does Syn-Ake Take to Work?

There is no guaranteed Syn-Ake timeline.

Historical supplier testing commonly assessed outcomes after about four weeks. [1,2]

Results from a finished skincare product can vary with:

• the formulation;
• Syn-Ake concentration;
• frequency of use;
• the severity and type of expression lines;
• age and skin characteristics;
• sun exposure; and
• the rest of the skincare routine.

Syn-Ake should not be expected to reproduce the speed or magnitude of effect associated with injectable botulinum toxin.

Is Syn-Ake Safe to Use Every Day?

Syn-Ake has been used daily in cosmetic testing, including manufacturer studies involving twice-daily use. [1,2]

A 2024 peer-reviewed laboratory study also evaluated cytotoxicity and genotoxicity and reported a favorable safety profile within the experimental conditions tested. [5]

However, laboratory safety testing does not establish that every finished Syn-Ake product is irritation-free for every user.

Daily-use tolerance depends on:

• the complete formula;
• the concentration of active ingredients;
• skin sensitivity;
• other products in the routine; and
• individual allergies or sensitivities.

Does Syn-Ake Have Side Effects?

Large independent clinical trials have not established a characteristic Syn-Ake-specific side-effect pattern.

As with other leave-on skincare products, possible reactions to the finished formulation may include:

• redness;
• itching;
• stinging;
• dryness;
• burning; or
• contact irritation.

A reaction to a product cannot automatically be blamed on Syn-Ake because creams and serums contain many ingredients.

Should You Patch Test Syn-Ake?

Patch testing is a sensible precaution when introducing any new leave-on skincare product, especially if you have sensitive or reactive skin.

The American Academy of Dermatology recommends testing a new skincare product on a small area before broader use and watching for reactions such as redness, itching, or swelling. [6]

Neurogan's current Syn-Ake Face Cream instructions also recommend patch testing before first use.

Who Should Be More Cautious With Syn-Ake?

Consider discussing a new skincare routine with a dermatologist or other qualified healthcare professional if you:

• have eczema, rosacea, or another significant inflammatory skin condition;
• have a history of serious cosmetic-product allergies;
• are using prescription dermatologic treatments;
• are undergoing procedures that temporarily compromise the skin barrier; or
• develop persistent irritation after introducing the product.

Pregnancy and Breastfeeding

There is limited human pregnancy-specific safety research for topical Syn-Ake.

This does not mean that Syn-Ake has been shown to be harmful during pregnancy. It means there is not enough direct evidence to make a strong pregnancy-specific safety claim.

If your routine also contains a retinoid, that is a separate issue: dermatology guidance advises avoiding retinoids during pregnancy. [3]

Common Syn-Ake Routine Mistakes

Using Too Many New Actives at Once

If you add Syn-Ake, retinol, acids, vitamin C, and several peptide products simultaneously, it becomes difficult to know which product caused irritation or which one is helping.

Assuming More Product Works Better

Applying several pumps instead of the recommended amount has not been shown to produce proportionally better results.

Expecting Botox-Like Results

Syn-Ake is a topical cosmetic peptide. It should not be expected to produce the same effect as an injected prescription neuromodulator.

Skipping Sunscreen

A wrinkle-focused routine should still include sun protection. Daily ultraviolet exposure contributes to visible skin aging regardless of which peptide products are used.

Ignoring Irritation

Persistent burning, swelling, or significant redness is not a sign that a skincare product is “working.” Stop the offending product and reassess the routine.

Frequently Asked Questions

Can I use Syn-Ake every day?

Yes, Syn-Ake is used in products intended for regular daily application. Follow the directions for your specific formula and reduce frequency if the overall routine causes irritation.

Can I use Syn-Ake twice a day?

Some products are designed for twice-daily use. Neurogan's current Syn-Ake Face Cream instructions specify morning and evening application.

Is Syn-Ake better in the morning or at night?

No clinical evidence establishes one time as superior. Use it according to the finished product instructions and in a routine that your skin tolerates.

Can I use Syn-Ake with retinol?

There is no established Syn-Ake-specific incompatibility with retinol. Because retinoids can irritate the skin, sensitive users may prefer to separate the products between morning and evening or alternate routines.

Can I use Syn-Ake with GHK-Cu?

There is no established rule requiring Syn-Ake and GHK-Cu to be separated. Neurogan's current product directions suggest applying its GHK-Cu Face & Neck Serum underneath the Syn-Ake Face Cream.

Can Syn-Ake and Argireline be used together?

Yes. A 2026 clinical study tested a multi-active serum containing both Dipeptide Diaminobutyroyl Benzylamide Diacetate and Acetyl Hexapeptide-8. That demonstrates they can coexist in a finished formulation, although it does not prove that the combination is synergistic. [4]

Do I apply Syn-Ake before moisturizer?

It depends on the product format. A Syn-Ake serum would generally go before a heavier moisturizer. A Syn-Ake cream, such as Neurogan's formula, can function as the cream step after lightweight serums.

Can I put Syn-Ake around my eyes?

Syn-Ake is frequently used for crow's-feet and outer-eye expression lines. Follow the specific product instructions and avoid direct contact with the eyes.

How long before I see Syn-Ake results?

There is no guaranteed timeline. Historical manufacturer studies commonly assessed results after about four weeks, while newer multi-active clinical research has followed users for longer periods. [1,2,4]

Should I use more Syn-Ake for deeper wrinkles?

No evidence shows that simply applying more product produces proportionally stronger results. Follow the recommended application amount.

The Bottom Line

Syn-Ake does not require a complicated skincare routine.

For a cream formulation, a practical routine is:

1. cleanse;
2. apply lightweight serums;
3. apply the Syn-Ake cream to expression-line areas; and
4. finish with sunscreen in the morning.

There is no established evidence that Syn-Ake must be restricted to morning or evening use, nor is there a proven requirement to separate it from retinol, GHK-Cu, Argireline, or other cosmetic peptides.

When combining several actives, the main practical issue is usually tolerability. Introduce products gradually, follow the instructions for each formulation, and simplify the routine if irritation develops.

For Neurogan Health's Syn-Ake Peptide Face Cream, the current directions are one pump morning and night on clean skin, with lightweight serums underneath and sunscreen after the cream during the day.

Resources:

1. DSM-Firmenich. SYN-AKE® product information and formulation guidance. INCI: Glycerin, Aqua, Dipeptide Diaminobutyroyl Benzylamide Diacetate.
2. Gorouhi F, Maibach HI. Role of topical peptides in preventing or treating aged skin. International Journal of Cosmetic Science. 2009;31(5):327-345. PMID: 19570099. doi:10.1111/j.1468-2494.2009.00490.x.
3. American Academy of Dermatology. Retinoid or retinol? Guidance on retinoid use, irritation and sun protection.
4. Zhu M, He X, Zhu Z, et al. The effect of a serum containing acetyl hexapeptide-8, dipeptide diaminobutyroyl benzylamide diacetate and gluconolactone on skin biomarkers, wrinkles and skin texture: Ex vivo and clinical studies. International Journal of Cosmetic Science. 2026. PMID: 41668671. doi:10.1111/ics.70087.
5. Gok B, Budama-Kilinc Y, Kecel-Gunduz S. Anti-aging activity of Syn-Ake peptide by in silico approaches and in vitro tests. Journal of Biomolecular Structure and Dynamics. 2024;42(10):5015-5029. PMID: 37349941.
6. American Academy of Dermatology. How to test skin care products before applying them more broadly.

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Disclaimer: This article is for educational purposes and is not a substitute for medical or dermatological advice. Cosmetic skincare products are not intended to diagnose, treat, cure, or prevent disease. Patch test new skincare products before broader use and discontinue use if persistent irritation develops.