The influence of Chlorella supplementation on blood vitamin D and vitamin K concentration in healthy adults.

The influence of Chlorella supplementation on blood vitamin D and vitamin K concentration in healthy adults: a randomized, controlled, open-label, parallel-group study. - The influence of Chlorella supplementation on blood vitamin D and vitamin K concentration in healthy adults.

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

JPRN

Registry ID

JPRN-UMIN000048945

Enrollment

Registered

2022-09-15

Start date

2020-01-14

Completion date

Unknown

Last updated

2026-06-29

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Healthy Japanese subjects

Interventions

Stop to taking Chlorella or multiple supplements containing, vitamin D, vitamin K, and vitamin B a month before the start of the trial. -After the start of the trial- Duration: Four weeks Test fo

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: Healthy subjects

Exclusion criteria

Exclusion criteria: 1.Subjects who are pregnant, lactation. 2.Subjects who are taking warfarin. 3.Subjects who are taking other alternative medicine or supplements. 4. Subjects with serious medical illness, such as hepatic disorder, nephropathy and cardiopathy. 5. Subjects who are judged as ineligible to participate in this study by the physician.

Design outcomes

Primary

Measure	Time frame
The blood concentrations of vitamin D and vitamin K at 2 and 4 weeks after Chlorella supplementation.	—

Secondary

Measure	Time frame
1. The blood concentrations of vitamin B1, vitamin B2, vitamin B6, vitamin B12, folic acid, and total homocysteine at 2 and 4 weeks after Chlorella supplementation. 2. Daily amount of dietary nutrient intake during the study period.	—

Countries

Japan

Contacts

Public ContactYumi Imai

Chlorella Industry Co., Ltd Department of Research & Development

yumi_imai@chlorella.co.jp0942-52-2191

Outcome results

None listed

Source: JPRN (via WHO ICTRP) · Data processed: Jul 3, 2026