If you are self-employed, enter health insurance premiums that you paid for yourself, your spouse, and your dependents (under age 27) under Other Common Business Expenses. (Click the screenshots below for reference.) Don't include premiums you paid for your employees or premiums paid through Healthcare.gov or your state marketplace.
The FAQ below provides instructions for getting to Other Common Business Expenses in TurboTax.
Where do I enter my health insurance premiums if I'm self-employed? https://ttlc.intuit.com/replies/4230299