There's not huge downside to taking once, but for adults the benefit isn't huge either. Especially as you get older (like older than 40 they only recommend it f

There's not huge downside to taking once, but for adults the benefit isn't huge either. Especially as you get older (like older than 40 they only recommend it for highly exposed people). There is a huge protective effect in young children, especially young infants. https://www.cdc.gov/nceh/radiation/emergencies/ki.htm#How_to_Take https://www.cdc.gov/nceh/radiation/emergencies/ki.htm#How_to...