What you will notice

Weeks 1 to 2, during the 10-day course: most people feel little, sometimes a lift in energy or better sleep. Weeks 2 to 4: blood counts shift toward a younger T-cell pattern. Weeks 4 to 8: fewer colds, faster recovery when you do get sick, better resilience to stress. Longer: with a course every 6 months the gain builds over years, in infections avoided and in heart, joint and bone health.