Pro Longer Concentrate by Janet St. Paul Studio for Hair and Beauty
Powered by FILLER-A100 and Amino Acid, the Serie Expert Pro Longer Ends Filler Concentrate Single Dose is the go-to treatment for long hair suffering from thinned ends. Thanks to the high concentration of the patented FILLER-A100 molecule, this disruptive professional formula instantly provides strength and durable thickness to ends.
Once a week, replace the Lengths Renewing Conditioner or Masque with the Single Dose Concentrate. Break the capsule and apply the concentrate on the ends.
Product Specifications
| Component | Filler-A100 |
|---|---|
| Amino Acid Content | Present |
| Form | Single Dose Capsule |
| Application Method | Apply directly to hair ends after breaking capsule |
| Frequency | Once per week |
FAQ
How should I apply the Pro Longer Concentrate?
Break the capsule and apply the concentrate directly to the ends of long hair. Use once per week, preferably as a replacement for your Lengths Renewing Conditioner or Masque.
Can I use this concentrate on curly or damaged hair?
Yes, the concentrate is formulated for long hair with thinned ends and can be used on curly or damaged hair as long as the ends are exposed and dry.
Is the FILLER-A100 molecule safe for all hair types?
Please contact customer service for information on compatibility with specific hair types or conditions.

Tracey Newman –
I’ve been using the Pro Longer Concentrate weekly for three months. My long hair ends, which were previously frayed and weak, now feel stronger and fuller. The application is simple and the results are noticeable after just one use.
Oliver Hunter –
It works well for adding thickness to the ends. I apply it once a week after washing. My hair feels more resilient and the split ends have reduced significantly.
Melanie Ferguson –
After trying several products, this one stands out. The FILLER-A100 seems to deliver real strength and volume to the ends. I notice a visible difference in texture and durability.
Caroline Gray –
It’s effective but I had to use it twice before seeing results. The texture is a bit thick, so I recommend applying it only to the very ends to avoid weighing down the hair.
Jennifer Mathis –
My hair has been thinning at the ends for years. After using this concentrate regularly, the ends are now more defined and less prone to breaking. I’m very satisfied with the outcome.