Sarah K La Vie en Gold Vegan Salon Smoothing Treatment 850ml

The Sarah K La Vie en Gold Ultimate Vegan Protein Restorative 850ml is a single-step salon smoothing treatment from Sarah K's premium Brazilian line. Built on a vegan amino-acid protein scaffold and a silicone smoothing film, it is designed for professional in-chair application: strand test, strand-by-strand application with a 1 cm root gap, 45-minute processing, rinse, full dry, then flat-iron sealing on very thin strands. The brand positions La Vie en Gold as a formula that straightens and treats at the same time, delivering a smoother, more aligned cuticle, reduced volume, and disciplined frizz on processed, frizzy, or volume-heavy hair.

At a glance

Type: Single-step salon smoothing treatment, vegan-positioned
Use category: Professional use only -- strand test mandatory before each application
Hero actives: Wheat amino acids, free amino-acid cascade, silicone smoothing film, sweet almond oil, myrrh oil
Protocol: Apply on dry hair, 1 cm root gap, 45 min processing, rinse, dry 100%, flat-iron on very thin strands
Format: 850ml glass decanter, gold-foil display box
Markers: Vegan Protein -- Made in Brazil

What it is

La Vie en Gold is Sarah K's premium-tier salon smoothing treatment. The bottle is a glass decanter with a crystal-style stopper, presented in a gold-foil display box. Sarah K positions the product as "an exclusive formula that straightens and treats at the same time" -- with a peptide and premium-oil narrative on the box. The verified INCI on the bottle anchors the formula around wheat amino acids, a full free-amino-acid cascade (aspartic acid, arginine, glycine and seven more), and a silicone film built from cyclopentasiloxane, cyclomethicone, and dimethiconol. Sweet almond oil and Brazilian myrrh oil bring the botanical layer. The smoothing mechanism is silicone-amino-acid-thermal, activated and sealed by the flat-iron pass at the end of the protocol.

Key ingredients

The active composition follows the INCI on the label, with the vegan protein source front-loaded:

Wheat amino acids (#4 in the INCI) -- the vegan protein source, replacing animal keratin. Provides the amino-acid scaffold that the silicone film locks onto during flat-ironing.
Free amino-acid cascade -- aspartic acid, arginine, glycine, alanine, serine, valine, phenylalanine, isoleucine, proline, threonine, histidine. Together, these are the building blocks the smoothing film deposits along the hair shaft.
Silicone smoothing film -- cyclopentasiloxane (#2), cyclomethicone, and dimethiconol form the flexible film that seals the cuticle and delivers the visible smoothing.
Prunus Amygdalus Dulcis (sweet almond) oil -- botanical conditioning oil for softness and shine.
Commiphora Myrrha oil -- a brand-distinctive Brazilian botanical, contributing the warm, resinous aromatic note characteristic of La Vie en Gold.
Sodium PCA + Sodium Lactate + PCA -- the natural moisturizing factor complex, supporting hydration retention after the rinse.

The full INCI is printed on the bottle. EU-disclosed fragrance allergens include D-Limonene and Alpha-Isomethyl Ionone.

What you can expect

Immediately after the flat-iron pass, hair lies flatter, the cuticle reflects more light, and frizz is visibly reduced. Volume comes down by one to three texture levels depending on the client's starting density and curl pattern. The treatment is cumulative -- a second application six to eight weeks later typically extends both the smoothing depth and the duration. Hair retains natural movement; the result is a polished, salon-finished smoothness rather than a poker-straight chemical relax. With sulfate-free aftercare and heat protection, results typically hold 8-12 weeks before gradually fading back to natural texture, with no harsh demarcation line as the treatment grows out.

Who it is for

La Vie en Gold is built for clients with frizz, volume, and styling fatigue on processed or naturally textured hair: color-treated, highlighted, wavy-to-curly, coarse, or heat-stressed lengths. It works well on hair that wants smoothing without losing all natural movement, and on clients who want a premium in-chair experience the salon can position at a higher service price. The vegan amino-acid scaffold suits stylists and salons committed to vegan-positioned services.

Who it is not for

Not recommended for severely over-bleached hair (level 9+) or hair already showing breakage from stacked chemical services -- restore with a protein-and-moisture program first. Not appropriate during pregnancy or breastfeeding (consult a doctor, per the label). Customers with known sensitivity to MCI/MI preservatives, fragrance allergens (D-Limonene, Alpha-Isomethyl Ionone), or any of the amino-acid blend ingredients should not proceed without a patch test. Not recommended for at-home application by clients without salon training.

Pro tips

Strand test from the crown and the nape sections before every full application -- the label requires this and it catches incompatibilities before they reach the full head.
Maintain the 1 cm root gap strictly; closer application risks scalp contact and uneven processing.
Dry hair to 100% before flat-ironing. Residual moisture creates steam pockets that weaken the silicone-amino-acid bond.
Flat-iron on very thin strands as the label specifies -- typically 180°C for fine hair, 200°C for medium, up to 230°C for coarse. Multiple slow passes beat fewer hot passes.
Always work in a ventilated area with gloves; heat-styling protein-rich formulas produces mild vapors.

How to use

Strand test first. Apply to small sections from the top and the nape, follow the full protocol, and assess. If the test strand becomes brittle, restore with a moisture program before proceeding.
Wash with a clarifying or micellar shampoo to remove buildup. Blow-dry until ~80% dry.
Apply La Vie en Gold strand by strand across the whole head, leaving a 1 cm gap from the root.
Let it process for 45 minutes.
Rinse thoroughly. Do not shampoo.
Dry hair 100% with a brush blow-out.
Flat-iron on very thin strands, 6-10 slow passes per strand, with temperature matched to hair density.
Cool down 5-10 minutes before any final styling.

Compatibility

Color: complete color services 1-2 weeks before La Vie en Gold for best results. Re-coloring after the treatment requires a 2-week wait. Bleach and highlights: compatible if the hair is not already over-processed; strand test mandatory on level 9+ bleached sections. Previous keratin or other smoothing services: compatible if the prior treatment is fully grown out or substantially faded. Relaxer: 2-month minimum wait after relaxer service. Extensions: remove before treatment, refit 7+ days after.

Safety: Professional use only. External use only. Wear gloves and use in a well-ventilated area. Avoid contact with eyes, skin, scalp, and mucous membranes. Rinse immediately if contact occurs. Discontinue if irritation appears. Consult a doctor if pregnant or breastfeeding. Keep in a cool place, away from children and pets. Handle the glass decanter with care. The full INCI is printed on the bottle.

In short

A premium single-step salon smoothing treatment from Sarah K's Brazilian portfolio, built on a vegan amino-acid protein scaffold and a silicone smoothing film. Strand test, 45-minute processing, rinse, full dry, flat-iron seal. Reduces volume and frizz, aligns the cuticle, and delivers a polished smoothness that holds 8-12 weeks with proper aftercare. 850ml glass decanter, gold-foil display box, made in Brazil. Professional use only.

Complete your Sarah K La Vie en Gold protocol

Sarah K Clarifying Shampoo with Micellar Water 1000ml: a deep-cleansing micellar shampoo to open the cuticle and remove buildup before La Vie en Gold -- the essential pre-treatment wash.
Sarah K Professional Hair Carnival Shampoo 300ml: a sulfate-free daily moisturizing shampoo to maintain smoothing results between salon visits and extend treatment longevity.
Sarah K Professional Hair Carnival Conditioner 300ml: a creamy conditioner that pairs with the Carnival Shampoo to smooth the cuticle, add slip, and protect the smoothing film.
Sarah K Sunset Leave-In Anti-Frizz Spray 200ml: a lightweight Brazilian leave-in mist that helps shield smoothed hair from heat tools, sun, pool, and beach -- essential post-treatment protection.

La Vie en Gold: frequently asked questions

Can I apply this at home, or is it strictly a professional salon treatment?

La Vie en Gold is labeled for professional use and is designed for in-chair application by a trained stylist. The protocol involves a strand test, strand-by-strand application with a 1 cm root gap, 45 minutes of processing, a thorough rinse, full blow-dry, and flat-ironing on very thin strands -- with gloves and proper ventilation throughout. Applied incorrectly at home, smoothing treatments can cause breakage, scalp irritation, or uneven results. If you have purchased a bottle and are not a stylist, take it to a salon for application.

Why do I need to do a strand test before each application?

The label requires it: "Perform a strand test before every application." Each client's hair history is different -- previous bleach, color, relaxer, or keratin services change how the fiber responds. The strand test uses small sections from the crown and nape, processed under the full protocol. If the test strand becomes brittle or shows negative signs, the label recommends a restorative protocol before any full application. This catches incompatibilities before they reach the entire head.

Does this treatment contain formaldehyde? Will it release fumes during flat-ironing?

The verified INCI on the bottle does not list formaldehyde, DMDM hydantoin, glyoxylic acid, or other commonly used formaldehyde-releasing preservatives. The smoothing mechanism relies on the vegan amino-acid scaffold and the silicone film, activated and sealed by the flat-iron heat. Per the label, ventilation and gloves are still required during application -- heat-styling any protein-rich formula can produce mild vapors. The full INCI is printed on the bottle.

Can I use this on colored, highlighted, or bleached hair? Before or after coloring?

Yes -- La Vie en Gold is compatible with colored, highlighted, and chemically smoothed hair. Schedule color services 1 to 2 weeks before the smoothing treatment for the best result; re-coloring afterward requires a 2-week wait. On level 9+ bleached sections, a strand test is essential, since high-porosity fiber can over-absorb the silicone-amino-acid blend. The amino-acid scaffold is generally color-friendly and does not have the color-fading reputation associated with aldehyde-based smoothing.

How long do the results last?

Typical results from silicone-amino-acid smoothing treatments hold 8 to 12 weeks, depending on hair texture, wash frequency, and aftercare. Sulfate-free shampoo, heat protection, and limited chlorine and salt-water exposure extend the result; daily hot-tool styling and harsh shampoos shorten it. The treatment is cumulative -- a second application 6 to 8 weeks later typically deepens the smoothing and extends the duration. Results fade gradually back to natural texture, without a harsh demarcation line.

Is this safe to use if I am pregnant or breastfeeding?

The label directs you to consult a doctor if pregnant or breastfeeding. While the verified INCI on the bottle does not contain formaldehyde, the manufacturer's caution is in place and we recommend following it. Any chemical service during pregnancy or nursing is a decision for you and your physician, weighing your individual circumstances. We do not encourage smoothing treatments during pregnancy or breastfeeding without that medical conversation first.

Who should avoid this treatment?

Customers with sensitivity to MCI/MI preservatives (Methylchloroisothiazolinone/Methylisothiazolinone), to fragrance allergens such as D-Limonene or Alpha-Isomethyl Ionone, or to any amino-acid blend ingredient should patch-test or avoid the treatment. Hair already brittle from over-bleaching or stacked chemical services should be restored with a protein-and-moisture program before any smoothing service. Anyone avoiding silicones for personal porosity-management reasons should choose a different system -- the smoothing mechanism here depends on the silicone film.

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