Hair Building Fibers Refill for Thinning Hair – Instantly Fuller, Thicker Look – Seamless Keratin Hair Fiber Powder

Price range: £19.39 through £28.35

Instantly Fuller Hair: Natural keratin fibers blend with your own hair to cover thinning areas in seconds.
Refill Bag: Top up your existing fiber bottle with 25g or 100g of powder.
10 Shades: Black, Gray, White, Dark Brown, Medium Brown, Light Brown, Blonde, Medium Blonde, Light Blonde and Auburn.
For Men and Women: Use it on hairlines, crowns and parting lines, or to fill in patchy beard areas.

Color

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100% NO-RISK MONEY BACK GUARANTEE

We think you’re going to love your products! But if you aren’t completely satisfied with anything, you can return or exchange the item(s) within 28 days of purchase.

You can see all the details about our return policy here. More questions? Just reach out—our customer service team is happy to help!

All UK Orders over £40 Get Free Shipping.

Estimated delivery dates: Oct 26, 2026 - Nov 2, 2026

Keep your hair looking full without buying a whole new bottle. The Sevich Hair Building Fibers Refill is made with natural keratin fibers that cling to your existing hair through electrostatic attraction. Thin areas look thicker with a natural finish. Pour the powder into your empty bottle and you’re ready to go.

Pick 25g for everyday use or 100g if you use fibers regularly and want to stock up. With 10 shades, you can match your hair or beard colour closely.

Hair building fibers are designed to disguise thinning or very thin patches. They aren’t suitable for completely bald or hair-free areas, because the fibers need existing hair to cling to.

How to Use

1. Pour the powder from the bag into your fiber bottle.
2. Sprinkle the fibers over the thinning area. Adjust with your hands or a comb, then pat gently so the fibers settle into your hair.
3. For the front hairline, hold your hand or a hairline optimizer in front of the hairline while you apply, for a cleaner edge.

Color	100g auburn, 100g black, 100g blonde, 100g dk brown, 100g grey, 100g lt blonde, 100g lt brown, 100g md blonde, 100g md brown, 100g white, 25g auburn, 25g black, 25g blonde, 25g dk brown, 25g grey, 25g lt blonde, 25g lt brown, 25g md blonde, 25g md brown, 25g white

Here are 5 more great reasons to buy from us:

Ordering from Grizzly Adam is 100% safe and secure so you can rest easy. Your personal details are never shared, sold or rented to anyone either.

Right now we're offering FREE Delivery in the UK to all orders over £40

Returns are easy, simply contact us for a returns number and send your item to our returns centre for fast processing. We'll get you a replacement or refund in a snap!

We insist that you love everything you buy from us. If you're unhappy for any reason whatsoever, just let us know and we'll bend over backwards to make things right again.

At Grizzly Adam we offer a ‘No Quibble’ Refund or Exchange Promise which is a 30 Day Money Back Guarantee! We are so confident that you will love our products that if for any reason you are not completely satisfied with your purchase, we will give you your money back with our 30 day no quibble promise.

Frequently Asked Questions

Are Grizzly Adam products high quality?

If you are looking for quality assurance on the products you buy then look no further than Grizzly Adam. We are truly dedicated to providing the highest quality products and literally go to the extra mile to source original and genuine raw materials and extracts, which are made from raw material to finished product in the UK to Good Manufacturing Practice (GMP) standards. GMP offers complete quality assurance; it is a set of strict pharmaceutical regulations, codes, and guidelines that ensure that products are constantly manufactured and controlled to a high standard which is suitable for use. GMP is highly regarded as it verifies manufacturing excellence and demonstrates a manufacturer’s ability to produce products that meet both the industry’s high standards of quality and safety as well as label claims, for consistently reliable clinical outcomes. No matter which country the raw materials are sourced from, Grizzly Adam’ GMP approved products are manufactured with strict compliance to the GMP pharmaceutical guidelines in the UK.

Are your products cruelty free?

Yes, Our products are only tested on the guys in our company, and no other animals. Grizzly Adam is 100% cruelty-free and we do not test our products on animals. We love all animals (especially grizzly bears).

Can I see your customer reviews?

Sure, we have reviews on all product pages and a dedicated reviews page. Just click the link below to see what our customers think of us. If your new around here or never heard of us, why not join us on Facebook and get to know us! See All Our Reviews Here

Can I Get a Discount?

Simple answer YES, You can get 20% OFF your first order by simply signing up to our newsletter at the bottom of this page. A discount code will be emailed to you in your welcome email. Newsletter subscribers get exclusive discounts emailed to them a few times a month which we also share on our Facebook page We also offer various discounts on site such as spend over £70 and get 15% off etc. We from time to time change these offers and only 1 coupon code at a time may be used. Any customer abusing coupon codes or excessively trying to stack coupon codes will have their order refunded and cancelled.

How much Postage and Packing do you charge?

Right now were offering FREE Delivery in the UK & Ireland to all orders over £40 UK Express Delivery (2 days): £8.99 UK Standard Delivery (3 – 7 days): £3.99 – All orders under £30 • Domestic Delivery Charge (5-30 days): £1.99 (sometimes this delivery option appears on certain products when we are shipping the item from our overseas warehouse and takes a little longer than normal). • International Delivery (Approx 5 to 10 working days): We can now ship orders internationally the New Zealand, United States (US), India, Japan, Singapore, Canada and Australia for £9.95 • International FREE Delivery (Approx 5 to 10 working days): We can now ship orders internationally the New Zealand, United States (US), India, Japan, Singapore, Canada and Australia for FREE when you spend £75+ If you live in a country not mentioned above, please contact us first for a quote and we will do our best to get you a good shipping rate. We are offering FREE Delivery in the following European countries for all orders over £50 France, Germany, Italy, Spain, Belgium, Bulgaria, Croatia, Czech republic, Denmark, Estonia, Finland, Hungary, Ireland, Latvia, Lithuania, Luxembourg, Netherlands, Poland, Romania, Slovakia, Slovenia and Sweden. European Standard shipping 5-10 days and under £30 spend is charged at £9.95 European Express shipping 3-5 days is charged at £19.99 We do not ship to BFPO addresses at this time as our products are not covered for damage or loss.

What is the delivery time once I have submitted my order?

With our ‘Same Day Dispatch Guarantee’ (excluding weekends and public bank holidays in the UK) all orders placed before 1.00pm will be dispatched on the day of receipt. Orders placed after 1.00pm are guaranteed to be sent on the next working day. For our express delivery service orders must be placed before 1.00pm Monday to Friday to arrive the next working day. For our standard delivery service we advise approximately 2-3 working days for delivery.

Where do I go if I can’t find the product I want to order?

There are two facilities available to you to search for the products you are looking for. By either typing the product name or description in the ‘Product Search” facility at the top right of any web page, or if you know the product code for the product you are looking for, you can enter the product code into the search bar. You can also shop by category for easy navigation. If you cannot find the product you are looking for, please do not hesitate to call our Customer Services on 01512003351 where one of our staff will be happy to help.

How can I view the status of my order or change my account details?

At Grizzly Adam we can track the progress of all orders being delivered to a UK address. Please call our Customer Services Department on 01512003351 to speak to a member of our team who will be happy to provide you with live details of your order.

Who do I need to contact if I’m having trouble logging in or have a general query?

If you have any queries regarding our website or our products please do not hesitate to call our Customer Service Department on 01512003351 or contact us via email nigel@project1-mke5mv4jgx.live-website.com

Who do I contact if I receive the incorrect items or my products have been damaged in the post?

In the unlikely event that your order arrives damaged or you have received the incorrect products, simply call our Customer Services Department on 01512003351 who will be happy to ensure that you are re-sent the correct products without delay.

Can I return my products for a refund or exchange?

At Grizzly Adam we offer a ‘No Quibble’ Refund or Exchange Promise which is a 30 Day Money Back Guarantee! We are so confident that you will love our products that if for any reason you are not completely satisfied with your purchase, we will give you your money back with our 30 day no quibble promise. Please contact our Customer Services Department on 01512003351 for further assistance. For information on how Grizzly Adam uses your personal details please refer to our Privacy Statement.