False. 5 doses of Novorapid insulin (first one I found on Google) is 22.07 EUR in France. After the public insurance scheme, that's 7.72 EUR (or 2.20 EUR in my region). And then you can get further reimbursement from the employer's (or your own) private insurance.

Edit: I just remembered that diabetes is recognised as a long term condition, so you would be 100% reimbursed by the public insurance scheme.