Hi,
Thanks for writing in.
Well the commonly documented side effects of Hyaluronic acid oral preparations are skin rashes and GI side effects. There is no medical documentation of it causing palpitations.
I would certainly reassure you.
May be you must geta HOLTER done which would help to find out the rhythm abnormality.
Do get back if you need any further information.
Sincerely,
Dr Kiran