How old should you be to take keragro and is it safe to take ? and will there be any negative results with in it ?

Get checked: It sounds like you are trying to get more hair growth. Looking online, there seem to be some questionable products out there - risky, especially if you don't know exactly what you need. Are you able to see a primary physician or dermatologist? You may not even need anything special; on the other hand, you may need a specialized treatment plan. Hope that helps.