Here is the design of a clinical trial:

Official Title: Effects of Vitamin K2 on Recovery From Muscle Damaging Exercise in Young and Older Adults

Included conditions:
- Inflammation
- Oxidative Stress
- Vitamin K
- Exercise
- Strength
- Recovery

Study Armgroups:
- {'label': 'Placebo', 'type': 'PLACEBO_COMPARATOR', 'description': '380 mg capsule/day micro-crystalline cellulose', 'interventionNames': ['Dietary Supplement: Micro-crystalline cellulose']}
- {'label': 'Vitamin K2', 'type': 'ACTIVE_COMPARATOR', 'description': '380 mg capsule/day micro-crystalline cellulose including 240ug/day Vitamin K2', 'interventionNames': ['Dietary Supplement: Vitamin K2']}

Interventions:
- {'type': 'DIETARY_SUPPLEMENT', 'name': 'Vitamin K2', 'description': 'Vitamin K2', 'armGroupLabels': ['Vitamin K2']}
- {'type': 'DIETARY_SUPPLEMENT', 'name': 'Micro-crystalline cellulose', 'description': 'Micro-crystalline cellulose', 'armGroupLabels': ['Placebo']}

Primary Outcomes:
- {'measure': 'Change in post exercise recovery of muscle strength', 'description': 'Muscle strength (MVC) of the knee extensor muscles will be measured before and after (3h, 24h, 48h, 72h) an acute bout of resistance exercise', 'timeFrame': 'Change from baseline to 12 weeks'}

Please estimate the sample size based on the assumption: 
power of 80% and alpha level of 0.05, accounting for dropout
Sample size {14}
        We have based our sample size on being able to (within age groups) detect a physiologically relevant difference in muscle strength of 10% with an SD of 10%, based on data from within our laboratory, with a power of 80% and alpha level of 0.05. This would require a sample size of 17 in each group and so we will aim to recruit 20 participants to each group (within age groups) to account for dropout.