Does HairCovery make hair look thicker?
Quick answer
Yes, over time. Choose HairCovery® Strengthening & Thickening Hair Serum, our leave-in serum, to strengthen hair with SenePlex+® and enhance hair thickness by adding volume, for thicker-looking hair with shine and a silky finish, while it supports a balanced scalp microbiome.
By SeneGence · 
Alan Kante, publisher · Updated
- 2 min read
- SenePlex+®
- Peptides
How do you use HairCovery Serum?
Its lightweight leave-in formula goes straight to the scalp. Apply dime-sized amount directly onto scalp with wet or dry hair every 2-3 days. Do not rinse. Massage it directly onto the scalp and the hair roots. See HairCovery Serum’s benefits and directions or HairCovery Strengthening & Thickening Hair Serum.
What is in HairCovery Serum?
HairCovery® Strengthening & Thickening Hair Serum strengthens hair with SenePlex+®, pairs Acetyl Tetrapeptide-3 with Trifolium Pratense (Clover) Flower Extract, and enhances hair thickness by adding volume, replenishes shine and leaves hair silky. See what HairCovery Serum carries or what SenePlex+ is. The ingredient’s maker has studied that peptide-and-clover material for fuller-looking hair and lashes; see the hair and lash studies. Earlier, HairCovery Thickening & Volumizing Shampoo paired the same peptide and clover with Hydrolyzed Rice Protein, which helps fortify hair and improves its volume and manageability for a more substantial-looking hair fiber and lifted finish. Read the HairCovery Shampoo history.
HairCovery® Strengthening & Thickening Hair Serum balances the scalp microbiome, soothes and reduces excess oil with Epilobium Angustifolium (Willowherb) extract. Willowherb’s antioxidants defend against free radicals. A phospholipid complex forms a lightweight film for lasting hydration. Epilobium Angustifolium (Willow Herb) Extract comes from fireweed, among the first plants to appear after Mount St. Helens erupted in 1980. It helps calm scalp irritation and dryness in HairCovery® Strengthening & Thickening Hair Serum. See fireweed’s skin and scalp care. Beauty Book 2026 (p. 51).
How long does HairCovery take?
HairCovery® Strengthening & Thickening Hair Serum helps strengthen and thicken hair over time, hydrates the scalp without buildup and supports a balanced scalp microbiome. Stay with the every-two-to-three-days rhythm to enjoy its fuller-looking results. Beauty Book 2026 (p. 51).
Which hair routine fits you?
Choose HairCovery when visible density, crown lift and fuller-, thicker-looking volume from the root are the goal; its scalp-balancing care is a bonus. For oil-prone roots, HairBalance leads, and for dry or frizz-prone hair, HairPlenish Scalp & Hair Serum. Compare HairBalance, HairPlenish and HairCovery or see the complete scalp-first decision guide.
Study results at a glance
Acetyl Tetrapeptide-3 with Clover and Dextran — hair and lash studies8 results
| Result | Kind of result | When it was measured |
|---|---|---|
| For the full Butylene Glycol, Water, Dextran, Acetyl Tetrapeptide-3, and Trifolium Pratense (Clover) Flower Extract material, the ingredient’s maker reports follicle elongation 58%, 51%, and 87% higher than untreated follicles at days 4, 7, and 11 in an ex vivo assay of 22 treated and 34 untreated follicles from one donor using 1% material. | Measured result | day 4; day 7; day 11 |
| For exact Acetyl Tetrapeptide-3, the ingredient’s maker reports 47% greater elongation than untreated follicles at day 7 in an ex vivo assay of 15 peptide-treated, 27 minoxidil-reference, and 27 untreated follicles; its stated reference comparison belongs only to that assay. | Measured result | day 7 |
| For the full Butylene Glycol, Water, Dextran, Acetyl Tetrapeptide-3, and Trifolium Pratense (Clover) Flower Extract material, the ingredient’s maker reports mean anagen density 9% higher, mean telogen density 42% lower, and anagen-to-telogen ratio 88% higher at day 90 in a 23-person baseline-controlled rinse-off scalp study using 1.5% material in shampoo and conditioner every two days. | Measured result | day 90 |
| For the full Butylene Glycol, Water, Dextran, Acetyl Tetrapeptide-3, and Trifolium Pratense (Clover) Flower Extract material, the ingredient’s maker reports the two specified Cutibacterium acnes scalp-microbiome ratios 36% and 62% lower at day 90 in 21 people using the rinse-off regimen. | Measured result | day 90 |
| For the full Butylene Glycol, Water, Dextran, Acetyl Tetrapeptide-3, and Trifolium Pratense (Clover) Flower Extract material, the ingredient’s maker reports a 15% favorable anagen-density delta, 52% favorable telogen-density delta, and 79-point between-group anagen-to-telogen-ratio delta after four months in a randomized 29-person leave-on scalp study using 5% material nightly. | Measured result | four months |
Show 3 more results
| Result | Kind of result | When it was measured |
|---|---|---|
| For the full Butylene Glycol, Water, Dextran, Acetyl Tetrapeptide-3, and Trifolium Pratense (Clover) Flower Extract material, the ingredient’s maker reports up to 27% lash-density improvement with a 93% responder rate at week 8 in a 17-woman split-eye study of a 2.5% material gel versus opposite-eye placebo, used morning and evening. | Measured result | week 8 |
| For the full Butylene Glycol, Water, Dextran, Acetyl Tetrapeptide-3, and Trifolium Pratense (Clover) Flower Extract material, the ingredient’s maker reports 45.5% more new lashes on the active side at week 8 while the placebo side recorded no new lashes in the same 17-woman split-eye study. | Measured result | week 8 |
| For the full Butylene Glycol, Water, Dextran, Acetyl Tetrapeptide-3, and Trifolium Pratense (Clover) Flower Extract material, the ingredient’s maker reports lash length increased by up to 0.70 mm at week 4 in the same 17-woman split-eye study and puts the active-side improvement at three times placebo at week 4 and five times placebo at week 8. | Measured result | week 4; week 8 |
See the full finding: Acetyl Tetrapeptide-3 with Clover and Dextran — hair and lash studies · Open the source document (PDF)
Full ingredient list
HairCovery® Strengthening & Thickening Hair SerumIngredient guide
Water / Aqua / Eau Butylene Glycol Sodium Acrylates Copolymer Acetyl Tetrapeptide-3 Aloe Barbadensis (Aloe Vera) Leaf Juice Orchis Morio (Orchid) Flower Extract Epilobium Angustifolium (Willow Herb) Extract Panthenol Tocopheryl Acetate Trifolium Pratense (Clover) Flower Extract Phenoxyethanol Fragrance / Parfum Lecithin Ethylhexylglycerin Amyl Cinnamal Hexyl Cinnamal Propylene Glycol Tetrasodium EDTA Linalool Benzyl Cinnamate Galactoarabinan Citronellol Dextran Limonene Hydroxycitronellal Sodium Hydroxide Sodium Metabisulfite Citric Acid Titanium Dioxide (CI 77891).
Ingredient list updated October 28, 2026. View HairCovery® Strengthening & Thickening Hair Serum on SeneGence