![]() ![]() Skin surface pH decreased at a statistically significant level. In the tap water group, skin density increased significantly, while skin thickness decreased significantly. Skin surface pH remained almost unchanged in the physiologically optimal range. ![]() However, when separately analysing those individuals from the mineral water group, who had routinely drunken comparably little before the start of the study, their skin thickness increased at a statistically significant level. Skin thickness increased slightly, albeit not at a statistically significant level. In the mineral water group measurements revealed a statistically significant decrease in skin density. Bioengineering in vivo measurements on the volar forearm included sonographic evaluation of skin thickness and density, determination of skin surface pH, assessment of skin surface morphology, and measurement of finger circumference. After an initial run-in phase of 2 weeks to monitor individual drinking habits, subjects had to drink 2.25 L day(-1) of either mineral water (n = 53) or tap water (n = 40) for 4 weeks. Ninety-three healthy subjects were included in our prospective study. ![]() The aim of our exploratory 'before-after' study was to evaluate the in vivo influence of drinking more than 2 L of mineral water or ordinary tap water per day on skin physiology. However, there is no published scientific study that has investigated this matter. It is generally stated that drinking plenty of water has a positive influence on skin condition. ![]()
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