#1 Neutralizes Brass & Yellow Tones!
Bye Bye Yellow Shampoo™
Bye Bye Yellow Shampoo™
Color Safe
Moist Care
Cool Tone
Shine Boost
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Bye Bye Yellow Shampoo™
Frequently Asked Questions
Frequently Asked Questions
1. What does Bye Bye Yellow Shampoo™ do?
Our formula helps neutralize unwanted yellow and brassy tones in blonde, bleached, highlighted, or gray hair. With gentle, sulfate-free cleansing and advanced HueSync™ tech, it leaves your hair looking bright, cool, and salon-fresh.
2. When should I use it?
Most people use it 2–3 times per week, either:
to maintain a cool blonde or silver shade,
after coloring or bleaching,
or anytime brassiness starts to show
It’s gentle enough for regular use and keeps your color looking its best.
3. Will it turn my hair purple?
Not at all. Unlike harsh purple shampoos, our balanced formula tones evenly without leaving behind purple residue. It simply cancels out yellow and orange hues for a clean, natural look.
4. Is it safe for daily use?
Yes! Bye Bye Yellow Shampoo™ is sulfate-free, paraben-free, and dermatologically tested. It’s non-drying, non-damaging, and safe for sensitive scalps and color-treated hair.
5. What makes Bye Bye Yellow Shampoo™ different?
200 ml of salon-quality purple shampoo
Advanced HueSync™ technology for even toning
Gentle, clean formula with botanical extracts
Free from sulfates, parabens & ammonia
6. Is there a guarantee?
Yes. You’re covered by our 30-day no-questions-asked guarantee. Don’t see brighter, cooler tones? Get a 100% refund—simple as that.
About Us
About Us
Formulated by Science. Built for Life.
At SYNRG, we don’t chase trends—we follow the research. Our mission is simple: to create high-performance supplements that actually work. Every ingredient we use is backed by clinical science, and every formula is crafted with care, clarity, and uncompromising standards.
Wellness, Simplified
We believe wellness should feel powerful—not complicated. Whether it’s calming the mind, fueling sharper focus, or optimizing recovery, our products are designed to support your body’s natural balance, without shortcuts or synthetic fillers.
What Sets SYNRG Apart
Clean, effective formulas
Clinically studied ingredients
GMO-free, gluten-free, lab-tested
Formulated for results—not hype
Invest in Your Longevity
With SYNRG, you're not just supplementing your health—you’re investing in your longevity.
30-Day Money Back
30-Day Money Back
Try SYNRG Risk-Free
We’re confident in the science, the purity, and the results behind every supplement we make. That’s why we offer a 30-day, no-questions-asked money-back guarantee.
If you don’t feel a difference in your focus, calm, sleep, or overall well-being, just let us know.
We’ll refund your purchase—no hassle, no stress.
Because wellness should come with confidence.
Why Bye Bye Yellow Shampoo?
Here are four compelling reasons why someone should take SYNRG Sulfate Free, For Color Treated
Neutralizes Brass & Yellow
Our advanced HueSync™ technology gently cancels out unwanted yellow and orange tones, leaving blonde, silver, and highlighted hair looking cool, bright, and refreshed.
Gentle & Hydrating Cleanse
A sulfate-free formula that removes buildup without stripping essential moisture, keeping your hair soft, smooth, and nourished with every wash.
Protects Color-Treated Hair
Specially designed for bleached, highlighted, and dyed hair, helping to maintain vibrancy and extend the life of your salon color.
Boosts Shine & Vitality
Infused with botanical extracts that enhance natural shine, reduce dullness, and give your hair a healthier, radiant appearance.
40,000+ Sold!
Join thousands of people who have seen life-changing results with our product.
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Finally, No More Brass!
I’ve tried so many purple shampoos over the years, but Bye Bye Yellow Shampoo™ is the first one that actually toned my blonde without leaving it dry or tinted purple. After just two washes, my highlights looked fresh and salon-bright again. It smells amazing, lathers well, and keeps my hair soft. Definitely a must-have for blondes who want to keep that cool, clean look between salon visits.
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My Blonde Looks Salon Fresh Again!
I was struggling with my blonde turning brassy just weeks after coloring, but Bye Bye Yellow Shampoo™ completely saved my hair. After the very first wash, the yellow tones were gone and my highlights looked cooler and brighter. It leaves my hair soft, not dry like other purple shampoos I’ve tried. Honestly, it feels like I just walked out of the salon every time I use it. Highly recommend!
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Perfect for My Silver Hair!
I’ve been looking for a shampoo that keeps my natural silver hair bright without making it feel dry, and Bye Bye Yellow Shampoo™ is exactly what I needed. It tones out the yellow instantly and leaves my hair soft and shiny. I get compliments all the time on how healthy and fresh my hair looks. This has become my go-to shampoo—I won’t use anything else now!
Our happy customers aren't just reviews;
they're living proof that our formula delivers real results.
Made In U.S.A
Free Of Side Effects
3 Years Of Research
Made In U.S.A
Free Of Side Effects
3 Years Of Research
Made In U.S.A
Free Of Side Effects
3 Years Of Research
Made In U.S.A
Free Of Side Effects
3 Years Of Research
Made In U.S.A
Free Of Side Effects
3 Years Of Research
Made In U.S.A
Free Of Side Effects
3 Years Of Research
Made In U.S.A
Free Of Side Effects
3 Years Of Research
Made In U.S.A
Free Of Side Effects
3 Years Of Research
Made In U.S.A
Free Of Side Effects
3 Years Of Research
Made In U.S.A
Free Of Side Effects
3 Years Of Research
Made In U.S.A
Free Of Side Effects
3 Years Of Research
Made In U.S.A
Free Of Side Effects
3 Years Of Research
🔒 The SYNRG Guarantee
We stand by the power of bright, brass-free hair. That’s why every purchase of Bye Bye Yellow Shampoo™ is backed by our 30-day money-back guarantee. Experience noticeably cooler, fresher tones and healthier-looking hair—or receive a full refund, no questions asked.
You’ve got nothing to lose—except the yellow and brassy tones.
Trustpilot reviews
Excellent 4.8 / 5
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Keeps My Silver Hair Bright
As someone with natural silver hair, this shampoo is a lifesaver. No more dull or yellow tones—just bright, shiny silver. My hair feels clean and soft every time.
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Game-Changer for Highlighted Hair
This shampoo keeps my highlights cool-toned and vibrant. I get so many compliments on my hair now. Plus, it smells great and doesn’t leave any purple residue.
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Worth Every Penny
I can’t believe the difference after just two uses. My balayage looks like I just left the salon. Bye Bye Yellow Shampoo™ is definitely worth every penny!
