Gluconacetobacter hansenii GK-1 Ingestion for 8 Weeks Improves Skin Discomfort in Healthy Adults: A Randomized, Double-Blind, Placebo-Controlled Study — Oak Academic Publishing
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Gluconacetobacter hansenii GK-1 Ingestion for 8 Weeks Improves Skin Discomfort in Healthy Adults: A Randomized, Double-Blind, Placebo-Controlled Study
R&D Division, Kewpie Corporation, Tokyo, Japan
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R&D Division, Kewpie Corporation, Tokyo, Japan
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R&D Division, Kewpie Corporation, Tokyo, Japan
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R&D Division, Kewpie Corporation, Tokyo, Japan
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R&D Division, Kewpie Corporation, Tokyo, Japan
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R&D Division, Kewpie Corporation, Tokyo, Japan
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Miura Medical Clinic, Osaka, Japan
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Department of Dermatology, Graduate School of Medicine, Ehime University, Toon, Japan
1 R&D Division, Kewpie Corporation, Tokyo, Japan
2 R&D Division, Kewpie Corporation, Tokyo, Japan
3 R&D Division, Kewpie Corporation, Tokyo, Japan
4 R&D Division, Kewpie Corporation, Tokyo, Japan
5 R&D Division, Kewpie Corporation, Tokyo, Japan
6 R&D Division, Kewpie Corporation, Tokyo, Japan
7 Miura Medical Clinic, Osaka, Japan
8 Department of Dermatology, Graduate School of Medicine, Ehime University, Toon, Japan
Gluconacetobacter hansenii GK-1 is an acid-resistant gram-negative bacterium used in vinegar brewing. Oral ingestion of GK-1 was previously reported to help maintain immunity and reduce nasal discomfort. Considering the suggested mechanism of action of activation of regulatory T cells via TLR4 to control Th1/Th2 balancing, GK-1 is also assumed to reduce skin discomfort secondary to immune reactions; however, this has not been validated in humans. Thus, we conducted a randomized, double-blind, placebo-controlled, parallel-group study on 100 healthy Japanese men and women (mean age, 47.6 ± 1.01 years) aged 20–64 years who consumed GK-1 (9 × 10 9 cells) daily for 8 weeks. Visual analog scale for overall, facial, arm, and leg skin discomfort was assessed before and after ingestion. The cumulative days of skin discomfort during the ingestion period were assessed. Compared with the placebo group, the G. hansenii GK-1 group had a significantly lower visual analog scale for overall and facial skin discomfort after 8 weeks and cumulative days of skin discomfort. Moreover, there were no adverse events attributable to G. hansenii GK-1. This study confirmed that oral ingestion of G. hansenii GK-1 contributed to skin integrity. The study protocol was preregistered at the Clinical Trials Registry System (registration no. UMIN000053005, December 7, 2023).
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