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Redken Acidic Grow Full Scalp & Hair Serum
Returns & Exchanges
Thank you for shopping at Zennkai.com.
ONLINE EXCHANGE POLICY
You have 10 calendar days to return an item for EXCHANGE ONLY from the date you received it. As the purchaser you would be responsible for return shipping charges.
Final sale items are not eligible for exchange or store credit. Final Sale items include Litres, Litre Duos, Clearance, Last Chance, Hot Tools, Hair Accessories, Brushes, Combs, Nail Polishes, Nail Accessories, Hair Extensions, and Appliances.
To be eligible for a exchange:
- your item(s) must be either be unused or no more than a quarter of the volume missing.
- your item(s) must be in the original packaging.
- your item(s) need to have the receipt or proof of purchase.
STEP 1 - Complete the online return form in full. Incomplete forms will not be accepted: Click here to download a return form
STEP 2 - Ship your item(s) back to us. You are responsible for return shipping charges. Shipping costs are non-refundable.
STEP 3 - We will immediately notify you on the status of your exchange after inspecting your returned item(s)
STEP 4 - You can exchange your item(s) or receive an online shop credit in the form of an e-gift card
In the event that you cannot find a suitable exchange a merchandise credit for the same value of the product purchased will be issued to you in the form of a store credit. Store credits cannot be redeemed for cash or refunded. You will receive your e-gift card within 5 business days after the exchange is confirmed
RETURNING TO A ZENNKAI SALON LOCATION
Should you prefer to return your online purchases to a location near you, come visit us! Simply bring your items and proof of purchase to our salons, following our set out Exchange Policy.
Final sale items are not eligible for exchange or store credit. Final Sale items include Litres, Litre Duos, Clearance, Last Chance, Hot Tools, Hair Accessories, Brushes, Combs, Nail Polishes, Nail Accessories, Hair Extensions, and Appliances.
If you are not fully satisfied with your purchase we will EXCHANGE it within 10 days with proof of purchase. EXCHANGE OR STORE CREDIT ONLY, NO CASH REFUNDS.
Hair Tools & Appliances
Zennkai provides a 1 year warranty on electrical tools with a manufacturer defect. They can be exchanged within one year of original purchase date, with proof of purchase and in its original packaging/box.
All electrical tools may be returned for exchange only due to manufacturer defect, with proof of purchase and all original components. No exchanges will be given without proof of purchase. Items must be in the original box/packaging. In the event that you cannot find a suitable exchange a merchandise credit for the same value of the product purchased will be issued to you in the form of a store credit.
Hot Tools & Appliances are a FINAL SALE unless manufacturer defect and are not eligible for exchange or store credit.
Shipping
You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are nonrefundable.
Contact Us
If you have any questions on how to return your item to us, contact us via email at zennkai@megahairfamily.com.
Corporate Office
310-5491 REGENT ST
BURNABY BC V5C 4H4
Email: zennkai@megahairfamily.com
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Densifying scalp & hair serum for thin, flat hair
Start at the source. This lightweight scalp serum works where density begins — directly at the root. Formulated with a 5% Strength Complex and pH-rebalancing Azelaic Acid, it nourishes the scalp, reduces breakage, and creates the ideal environment for thicker, denser-looking hair over time. Use on damp or dry hair, no rinsing required.
Best for:
✔ Thin, flat, or fine hair
✔ Hair prone to fall and breakage from brushing
✔ All hair types, including color-treated
KEY BENEFITS
- Denser, fuller-looking hair — part of the Acidic Grow Full System, designed to unlock the fullness of +5,000 hair fibers*
- 2X stronger strands — clinically tested to fortify hair from within
- 2X less breakage — from brushing and everyday styling
- Scalp pH rebalancing — Azelaic Acid restores the scalp's natural acid mantle for a healthier growth environment
- Clinically tested to hydrate the scalp — moisture where it matters most
- Lightweight, no-rinse formula — works on both damp and dry hair, no disruption to your routine
*91% of users in a consumer study agreed hair feels thicker.
HOW TO USE:
- On damp or dry hair, spray directly onto the scalp and roots from about 1 inch away.
- Use fingertips to massage the serum into the scalp.
- Do not rinse. Style as usual.
Pro tip: For full system results, pair with the Redken Acidic Grow Full Densifying Shampoo, Conditioner, and Instant Densifying Spray.
The Science Inside
| Ingredient | What It Does |
|---|---|
| Azelaic Acid | Rebalances the scalp's pH to support a healthier growth environment |
| Caffeine | Energizes and awakens the scalp |
| Prebiotics | Hydrate and protect the scalp's acid mantle |