what are the side effects caused by collagen?

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What are the uses of collagen ?
1. skin care products ( topical )
2. joint and bones care ( topical )
- collagen suppliment isnt a main or primary medication to any medical condition , its only a suppliments or a second line treatment 
- consult your doctor before taking this suppliments 
What are the side effects of collagen ?
- oral :
1. mouth bad taste 
2. heartburn
3. fulliness
4. stomach upset 
- topical :
1. skin irritation 
When not to take collagen :
1. collagen allergy 
2. kindey and liver chornic disease 
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