I am self employed. Is it true that my health insurance premium can be fully deductible for income tax.

Self employed individuals are able to purchase health insurance plan to cover for all family members (spouse/ common law partner and children) and have the premiums deducted as a business expense.  This would cover up to $1500  annual premium per adult and $750 annual premium per child.  Should the premiums exceed this cap, the difference can be claimed under “medical expense tax credit.”
Please see this article from Sun Life insurance or talk to your insurance agent.