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clinical finding

Acetyl Tetrapeptide-3 with Clover and Dextran — hair and lash studies

in the study

Manufacturer studies of the Acetyl Tetrapeptide-3, Clover Flower Extract, and Dextran material, plus a separate exact-peptide follicle assay

what it showed

Clariant reports up to 27% lash-density improvement at week 8 in a split-eye study, plus hair-cycle, scalp-microbiome, and follicle findings across distinct human and ex vivo studies.

You will find Acetyl Tetrapeptide-3 with Clover Flower Extract and Dextran in current brow, hair-serum, mascara, and lash-primer formulas.

For fuller-looking brows, lashes and hair, Acetyl Tetrapeptide-3 appears in five current formulas. Choose BrowSense® Volumizing Brow Gel for brows and HairCovery® Strengthening & Thickening Hair Serum for scalp and roots. For lashes, UnderSense® 3-in-1 Maximizing Lash Primer goes before mascara; LashSense® VolumeIntense® Mascara and LashSense® VolumeIntense® Waterproof Mascara give you the two mascara choices.

Complete measurements and study notes

9 details
How it was evaluated
Randomized leave-on scalp study, baseline-controlled rinse-off scalp work, scalp-microbiome analysis, split-eye lash imaging, and ex vivo human-hair-follicle assays
Who took part
Human studies included 29 leave-on participants, 23 rinse-off participants, 21 microbiome participants, and 17 split-eye lash participants
Statistical context
Across distinct studies, Clariant reports fuller-looking hair and lashes, scalp-microbiome changes, and follicle elongation.
Information checked
2026-09-12

Measured results · four months

Anagen density, telogen density, and anagen-to-telogen ratio

15% favorable anagen-density delta, 52% favorable telogen-density delta, and 79-point anagen-to-telogen-ratio delta

For the full Butylene Glycol, Water, Dextran, Acetyl Tetrapeptide-3, and Trifolium Pratense (Clover) Flower Extract material, Clariant 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.

When it was measured
four months

Measured results · day 90

Anagen density, telogen density, and anagen-to-telogen ratio

mean anagen density 9% higher, mean telogen density 42% lower, and anagen-to-telogen ratio 88% higher

For the full Butylene Glycol, Water, Dextran, Acetyl Tetrapeptide-3, and Trifolium Pratense (Clover) Flower Extract material, Clariant 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.

When it was measured
day 90

Specified Cutibacterium acnes ratios

specified scalp-microbiome ratios 36% and 62% lower

For the full Butylene Glycol, Water, Dextran, Acetyl Tetrapeptide-3, and Trifolium Pratense (Clover) Flower Extract material, Clariant reports the two specified Cutibacterium acnes scalp-microbiome ratios 36% and 62% lower at day 90 in 21 people using the rinse-off regimen.

When it was measured
day 90

Measured results · week 8

Lash density

up to 27% lash-density improvement with a 93% responder rate

For the full Butylene Glycol, Water, Dextran, Acetyl Tetrapeptide-3, and Trifolium Pratense (Clover) Flower Extract material, Clariant 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.

When it was measured
week 8

New-lash count

45.5% more new lashes on the active side

For the full Butylene Glycol, Water, Dextran, Acetyl Tetrapeptide-3, and Trifolium Pratense (Clover) Flower Extract material, Clariant 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.

When it was measured
week 8

Measured results · week 4; week 8

Lash length

lash length increased by up to 0.70 mm

For the full Butylene Glycol, Water, Dextran, Acetyl Tetrapeptide-3, and Trifolium Pratense (Clover) Flower Extract material, Clariant reports lash length increased by up to 0.70 mm at week 4 in the same 17-woman split-eye study and describes the active-side improvement as three times placebo at week 4 and five times placebo at week 8.

When it was measured
week 4; week 8

Measured results · day 4; day 7; day 11

Follicle elongation

follicle elongation 58%, 51%, and 87% higher than untreated follicles

For the full Butylene Glycol, Water, Dextran, Acetyl Tetrapeptide-3, and Trifolium Pratense (Clover) Flower Extract material, Clariant 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.

When it was measured
day 4; day 7; day 11

Measured results · day 7

Follicle elongation

47% greater elongation than untreated follicles

For exact Acetyl Tetrapeptide-3, Clariant 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.

When it was measured
day 7

Measured results

Acetyl Tetrapeptide-3 with Clover and Dextran — hair and lash studies

For fuller-looking lash care, Acetyl Tetrapeptide-3 has been studied with Trifolium Pratense (Clover) Flower Extract and Dextran. UnderSense® places that combination beside Biotinoyl Tripeptide-1 and conditioning Jojoba Esters in its buildable lash primer.