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what are cinnamon tablets side effects :

- as a suppliment , this product havnt go through the medical paths to prove its benefits and side effects , but its possible to have those side effects :
1. low blood pressure 
2. abdominal pain 
3. voimiting and nausea 
4. headache 
5. diarrhea or constipation 
- large consuming amounts  complication :
1. liver diseases 
2. mouth and oral cavity lesion and sores 
3. shortness of breath

can cinnamon tablets cause chest pain or enlargment :

cinnamon tablet dont really specificly cause chest enlargment and pain , but its possible according to the info you have mentioned in your question such as training and whey protien and your life style 

what is the nest step :

1. its better not to use cinnamon if there is no medical need 
2. drink plenty of water
3. have a rest days and avoid over stressed work out this period 
4. massage and warm showers , and use topical analgesic medications 
5. if the pain presist or new symptoms appeared , consult your doctor as soon as possible 
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