Ouai Scalp Serum vs Kerastase vs Trybello: Price, Results & Reviews
BY TRYBELLO
Jan 21, 2026
Key Takeaways
- Ouai Scalp Serum prioritizes hydration over regrowth—suitable for dry scalps, but the formula lacks caffeine and results typically take 90–112 days.
- Kerastase Genesis Serum addresses breakage from brushing rather than root hair loss, requires the full system for clinical results, and offers no money-back guarantee.
- Our Trybello Hair Helper Spray delivers biotin, caffeine, and castor oil in a no-mess spray format, with reduced shedding often noticeable by week 4 and visible fullness by week 16.
- Scalp serums work best with consistent daily use—most require 6–16 weeks before visible thickness improvements appear.
- When comparing value, consider price per ml, results timeline, and what protection you have if the product doesn't work for you.
Finding the Right Scalp Serum for Thinning Hair
Noticing more hair in the drain or a wider part line? Hair thinning affects millions, and finding the right treatment often means wading through conflicting claims and confusing ingredient lists. The best scalp serums nourish follicles directly, improve circulation, and create a healthier scalp environment. But with so many options promising miracle results, separating marketing hype from genuine efficacy can feel overwhelming. This guide compares three popular options to help you make an informed decision.
“Doctor-Approved Natural Spray Rapidly Boosts Growth & Thickness.
Why 100,000+ Women Are Switching to Trybello!"
Join over 100,000 happy customers who've transformed their hair with our doctor-formulated spray in just 12 weeks, rated 4.8/5 by 40,000+ real users.
Proven Natural Ingredients
- • Caffeine Extract – Blocks DHT and boosts blood flow to follicles
- • Biotin – Direct scalp absorption, no pills needed
- • Castor Oil – Soothes inflammation and locks in moisture
- • Rice Water Extract – Strengthens hair and reduces shedding
120-Day Growth Guarantee: No results? 100% money back, no questions asked.
Ouai Scalp Serum
Ouai Scalp Serum takes a skincare-inspired approach, combining adaptogens, Sodium Hyaluronate, and peptides to support scalp health and hair density. (Image courtesy of Ouai)
Ouai takes a skincare-inspired approach to scalp health. Their serum combines adaptogens with Sodium Hyaluronate for hydration. The formula also includes Acetyl Tetrapeptide-3 alongside Red Clover Extract to support hair density.
The formula lacks caffeine to stimulate circulation, which may matter for those seeking faster visible changes. Users with sensitive or dry scalps often appreciate this gentle, hydration-first approach.
Kerastase
Kerastase Genesis Serum is a silicone-free formula targeting hair fall from brushing and styling damage with Aminexil, caffeine, and botanical extracts. (Image courtesy of Kerastase)
Kerastase’s Genesis Serum Anti-Chute Fortifiant is a silicone-free formula targeting hair fall from brushing and styling damage rather than hair loss at the root. The formula combines Aminexil 1.5% to anchor follicles and prevent collagen hardening, caffeine for scalp micro-circulation, ginger root extract for protection against external aggressors, and Edelweiss native cells for antioxidant support.
Trybello Hair Helper Spray
Our Trybello Hair Helper Spray combines biotin, caffeine, and botanical extracts in a vegan spray format, with visible results typically appearing by week 16.
Our Trybello Hair Helper Spray combines targeted ingredients in a practical spray format. The formula includes:
- Biotin for follicle strength and keratin support
- Caffeine to stimulate circulation and support the hair growth cycle
- Castor Oil for scalp nourishment and moisture
- Rice Extract (Oryza Sativa) provides amino acids for hair resilience
- Ginger Extract to invigorate the scalp and support circulation
- Botanical extracts, including Sophora Flavescens and Angelica Root, from traditional Eastern hair care practices
The spray format allows even distribution without dripping, making daily application simple. The formula is vegan and cruelty-free. Many notice reduced shedding around week 4, with improved thickness and fullness typically becoming noticeable by week 10. By week 16, customers commonly report visibly fuller, healthier-looking hair.
Price & Value Breakdown
When evaluating scalp serums, long-term costs matter as much as the initial price:
- Ouai: $54 for 60ml ($0.87/ml) without subscription options. The brand offers a 45-day return policy for unused portions of website purchases.
- Kerastase Genesis Serum: $58-62 for 90ml (approximately $0.66/ml). The larger bottle size means fewer repurchases, though there's no money-back guarantee if results don't meet expectations.
- Trybello Hair Helper Spray: Flexible pricing includes one-time purchases from $49.97 (30-day supply) to $89.97 (90-day supply, a 35% savings). Subscribe & Save options reduce costs by 20%, bringing the 30-day supply to $39.98/month, the 60-day supply to $55.98 every two months, and the 90-day supply to $71.98 every three months. Subscriptions can be skipped or cancelled at any time.
Our 120-day Growth Guarantee also factors into value. You can use the product through a complete hair cycle before deciding. To qualify, document your journey with timestamped photos at days 1, 30, and 120 of consecutive use. Claims are processed within 3 business days.
Results & Timelines
Hair serum results require patience, with products showing improvements between 6 to 16 weeks depending on the formula and consistent daily use.
While patience is essential with any hair care product, knowing what to expect helps maintain consistency.
Ouai Scalp Serum
Users should expect results within 90 to 112 days of consistent daily use. In a 3-month consumer study of 109 participants, about 90% reported that their hair felt healthier and noticed visible improvements in hair appearance.
Kerastase Genesis Serum
The serum is designed for a minimum 6-week treatment period. Clinical brushing tests showed dramatic reductions in hair fall from breakage—users saw up to 84% less hair fall due to breakage when using the complete Genesis system (shampoo, conditioner, and serum). Results focus on strengthening existing hair and reducing mechanical damage rather than stimulating new growth.
Trybello Hair Helper Spray
Our Trybello Hair Helper Spray is designed to deliver visible improvement within 16 weeks of consistent use. Many customers notice reduced shedding in the first few weeks—by week 4, less hair in the shower drain and on your brush. Around week 10, improved thickness and fullness typically become noticeable. By week 16, customers commonly report visibly fuller, healthier-looking hair.
Application & User Experience
- Ouai Scalp Serum: Uses a glass pipette dropper for targeted application. Fill the dropper, then apply drops along your part and hairline, massaging gently to distribute.
- Kerastase Genesis Serum: Apply 3–4 pipettes to dry or towel-dried scalp, section by section, once daily.
- Trybello Hair Helper Spray: Spray 1–2 pumps directly onto affected areas and massage in. Leave for at least 30 minutes, or apply before bed and leave overnight. As a leave-in product, you can style your hair immediately. Use once or twice daily for best results.
Quick Comparison: Ouai vs. The Ordinary vs. Trybello
| Feature | Ouai Scalp Serum | Kerastase Genesis Serum | Trybello Hair Helper Spray |
|---|---|---|---|
| Price | $52 / 60ml | $58-62 / 90ml | From $39.98 / month |
| Price per ml | $0.90/ml | $0.66/ml | Varies by plan |
| Key Ingredients | Adaptogens, Hyaluronic Acid, Peptides | Aminexil 1.5%, Caffeine, Ginger Root, Edelweiss | Biotin, Caffeine, Castor Oil, Rice Extract |
| Format | Dropper | Dropper | Spray |
| Results Timeline | 90–112 days | +6 weeks | 4–16 weeks |
| Guarantee | 45-day returns | None | 120 days (with documentation) |
| Best For | Dry/sensitive scalps | Breakage from brushing/styling | Thinning/fine hair |
Who Benefits Most From Each Option?
Each product serves different hair care needs:
- Sensitive, dry scalps: Ouai's gentle, hydration-focused formula soothes without overwhelming.
- Thick or color-treated hair seeking luxury: Kerastase provides the premium experience and strengthening benefits designed for this hair type.
- Thinning hair seeking visible improvements with value: Trybello Hair Helper Spray offers the best combination of results, price, and risk-free trial.
Why Trybello Hair Helper Spray Stands Out
We offer a plant-based formula with biotin and caffeine, backed by over 50,000 verified reviews and a 120-day money-back guarantee.
Choosing a scalp serum ultimately comes down to what matters most to you. If you want visible results without premium pricing and the security of knowing you can get your money back if it doesn't work, our Trybello Hair Helper Spray delivers on all fronts.
The plant-based formula with biotin, caffeine, and castor oil supports healthier-looking hair without harsh chemicals or hormones. Over 50,000 verified reviews speak to real results, and the 120-day guarantee means you can try it completely risk-free.
For those looking to complement their topical routine with internal support, we also offer Trybello Hair Repair & Anti-Stress Gummies. These sugar-free gummies combine clinically studied Anagain™ with stress-supporting ingredients like L-theanine and zinc, addressing hair wellness from the inside out.
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Disclaimer: Individual results may vary. The information provided in this article is for educational purposes only and is not intended as medical advice. Consult a healthcare professional before starting any new hair care regimen, especially if you have underlying scalp or health conditions. Product pricing is subject to change. For full terms, visit Trybello.com.
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