Exclusion criteria
muscle soreness, allergy, osteopathy, volume of blood collected
ALLERGY, DISEASES, OSTEOPATHY, FISH SKIN
The exclusion criteria were as follows: (1) previous or current medical history of serious diseases of the circulatory, respiratory, gastrointestinal, urinary, or endocrine systems; (2) routinely using pharmaceutical products or quasi-pharmaceutical products that may affect the study results, or unable to stop such use during this clinical trial; (3) allergy to medicine or food (including collagen or gelatin); (4) routinely consuming dietary supplements that may affect the study results or unable to stop such consumption during this clinical trial; (5) preferring collagen-rich foods such as fish skin or beef tendon and consuming them at least 4 times a week; (6) engaged in any exercise or physical activity followed by muscle soreness for 1 month prior to the screening-test; (7) planned to engage in any exercise or physical activity that could cause muscle soreness during this trial; (8) regularly receiving treatments such as massage, osteopathy, chiropractic, or acupuncture, or unable to refrain from such treatments during the period of this clinical trial; (9) unable to participate according to the schedule of this clinical trial; (10) smoker; (11) heavy alcohol drinker; (12) extremely irregular eating habits or an irregular life schedule, such as with shift workers or late-night workers; (13) participating in other clinical trials have finished doing so within 4 weeks, or planned to do so after providing informed consent for this study.; (14) donated 200 mL of component blood or whole blood in the month prior to the start of the study; (15) donated 400 mL of whole blood within 3 months prior to the start of the study; (16) total volume of blood collected in the 12 months prior to the start of this study plus that planned to be collected in the present study, exceeding 1200 mL; (17) judged ineligible to participate in the study by the principal investigator physician.