Background　We have already reported that konjac extract can improve skin condition in cheeks, but the effects for the whole body did not show it. In this report, to study whether konjac extract can improve transepidermal water loss（TEWL）of whole body, a randomized placebo controlled double blind test was performed in healthy volunteers who had reported dryness of the skin.
Methods　157 health volunteers took a drink（340 mL/day）with or without konjac extract including 1.8 mg of glucosylceramide for 12 weeks and did not take it for the following 4 weeks. TEWL was evaluated at the neck, upper back, elbow and dorsum pedis using a Tewameter.
Results　On elbow and dorsum pedis, TEWL of the konjac extract uptake group was significantly reduced at 8 and 12 weeks compared with the control group.
Conclusions　These results demonstrate that dietary konjac extract containing glucosylceramide improves skin condition of whole body.