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Stretch Mark Trials

Photobiology Laboratory of the Medical University of South Africa, 2005

Objective: To assess the efficacy of Bio-Oil in improving the appearance of stretch marks.

Sample: 20 Females aged 18-55. Stretch mark location: abdomen.

Method: Single-blind (assessor), randomized and controlled. Paired study design allowing for intra-subject comparison. Subjects had bi-lateral abdominal stretch marks, enabling half abdomen study design. Product applied twice daily for 12 weeks to the targeted area. Application performed under supervision at regular intervals. Assessments conducted at 0,4,8 and 12 weeks.

Result: Bio-Oil improved the appearance of stretch marks in both objective and subjective assessments. 50% of subjects recorded an improvement of appearance at 8 weeks.  

Full Trial pdf

proDERM Institute for applied dermatological reserach, Hamberg, Germany, 2010

Objective: To assess the efficacy of Bio-Oil in improving the appearance of stretch marks.

Sample: 38 female participants of varying ethnicities and aged 18 to 65. Stretch mark causes: various (post pregnancy, weight gain or adolescent growth spurt). Stretch mark location: abdomen, thighs and hips.

Method: Double-blind, randomized and parallel group. Subjects had matching stretch marks or a stretch mark large enough to allow a half-half stretch mark application and intra-subject comparison. Product was applied twice daily for 8 weeks. No additional massage performed on the target area. Application performed under supervision at regular intervals. Assessment conducted at 0,2,4 and 8 weeks. Different Scar parameters as defined in the Patient and Observer Scar Assessment Scale (POSAS) were evaluated.

Result: Bio-Oil is efficacious in improving the appearance of stretch marks. A statisticaly significant result after only 2 weeks (day 15), evident in 95% of subjects. After 8 weeks (day 57) 100% of subjects showed an improvement, with the extent of the improvement more than double that at 2 weeks. A continuous improvement of POSAS over the duration of the study. 

Full Trial pdf