Phen24 is a safe formula and anyone can use it. However; if you are going to become a mother, avoid using it. If you are suffering from certain diseases such as liver and kidney diseases, diabetes, depression, stresses, breast cancer; you cannot use the formula. Also, if you are using any medicines or antidepressants; you should not use Phen24. People suffering from endocrine and autoimmune disorders and the teenagers under the age of 18 must also avoid the use of this solution for getting slim fast.