Hi Thank you for asking HCM I have gone through your query.It is difficult to say which content is allergic for you as any contents can be allergic to anyone. The content DMAA (1,3 Dimethylamylamine) which FDA has given warning as a potentially danger product.Almost 86 adverse events reported.Depression, anxiety, loss of conciousness and even death has reported after taking this.So it is better to avoid this product and do your work outs naturally.You can take plain protein supplements.You can also take glucose when you feel tired which gives a natural stimulation.Hope this may help you. Let me know if anything not clear. Thanks.