There is no expiration date for cashier's checks. If a cashier's check isn't cashed in a timely manner, considered six months by most banks, it can be considered void or invalid. Keep Learning.
How often might 50000 IU vitamin D be taken - results of clinical trials. There have been many extremely successful vitamin D intervention trials. The trials are listed in the following table are sorted by number of days between doses of 50,000 IU. It appears that the higher the dose of vitamin D the more diseases which are prevented or treated.
Some researchers claim that *if* vitamin D levels are optimized then our immune system is in top condition to deal with flu viruses which would have minimal effect on us. I've seen recommendations that after flu virus has invaded the body to take 200,000iu daily of vit.D3 for several days.