An interventional study of DAP-HAI-403 and Placebo in Hair Damage, Hair Health and Hair Strength, sponsored by Dong-A Pharmaceutical. Completed at 1 site in South Korea. Open to participants aged 19 Years to 60 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-03-09.
Sponsored by Dong-A Pharmaceutical · Not applicable, Interventional, and Treatment
This study is designed to evaluate the efficacy and safety of Hydrolyzed Keratin Peptide Powder in promoting hair health in adult with mild to moderate hair damage, compared to a placebo control.
Dong-A Pharmaceutical is the lead sponsor of 3 studies on the registry; none are open to participants now.
Counted across the registry records on this site, refreshed daily.
Exclusion Criteria:
250mg/capsule (Hydrolyzed Keratin Peptide Powder 500mg/day)
Dietary Supplement: DAP-HAI-403
250 mg/capsule (500 mg/day as placebo)
Dietary Supplement: Placebo
Each subject takes two capsules per day for 24 weeks. Each capsule contains DAP-HAI-403 250mg.
Each subject takes two capsules per day for 24 weeks.
The change of hair elasticity
Elasticity is measured using a Universal Testing Machine (UTM) at a stretching rate of 2 cm/min, and the mean tensile resistance prior to breakage was recorded. A higher score indicates a better outcome.
Time frame: Change of the week 24 from baseline
The change of hair luster
Hair luster is evaluated using visual grading (5-point scale）, glossymeter （mean value ）, and scanning electron microscopy (SEM、 12-point scale ). Both visual grading and glossymeter indicate better outcomes with higher scores. For SEM, lower scores indicate better outcomes.
Time frame: Change of the week 24 from baseline
The change of Self-evaluated satisfaction
Participants assessed their satisfaction of overall changes from baseline across 7 questions, rating perceived satisfaction on a 10-point scale (1 = not at all, 10 = very much).
Time frame: Change of the week 24 from baseline
The change of Hair diameter
Hair diameter is evaluated by phototrichogram device (Folliscope 5.0) at 50× magnification. A higher score indicates a better outcome.
Time frame: Change of the week 24 from baseline
The change of Hair density
Hair density is measured using Folliscope 5.0 at 14× magnification. A higher score indicates a better outcome.
Time frame: Change of the week 24 from baseline
The change of Hair root volume
Hair root volume was quantified using I Max-plus image analysis software by measuring the angle (°) between the parting's origin and its highest lateral points-smaller angles after treatment indicated improved root lift and volume.
Time frame: Change of the week 24 from baseline
The change of Scalp moisture
Scalp moisture is measured using the DermaLab Hydration Pin Probe. A higher score indicates a better outcome.
Time frame: Change of the week 24 from baseline
The change of Scalp TEWL
Scalp TEWL is assessed using a Tewameter TM Nano. A lower score indicates better outcomes.
Time frame: Change of the week 24 from baseline
The change of Self-improvement evaluation
Participants were asked to complete a self-evaluation questionnaire regarding their overall improvement in the study across 5 questions, rating perceived improvement on a 10-point scale (1 = no improvement, 10 = marked improvement).
Time frame: Week 24
Plan to share: No
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This study is completed, as verified in Feb 2026. You cannot join it, but the record below documents what was studied.
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