Besides from magnesium, calcium and probiotics supplement. . . what other vitamins are best to take before bed time to boost our immune system. Thanks!

None. Vitamins and supplements do not boost one immune system. You are wasting your money. Stop believing the hype. Calcium is higher doses is potentially dangerous. .
Vitamin D3. The only vitamin which appears to have some immune regulatory effect is vitamin D3. About 70% of the US population are deficient or insufficient . Most people likely need 2000 u /day as maintenance although the requirement varies greatly.