Did you enter a 1095-A? If you did and you selected that you were self-employed and linked the form to your business, then this would be automatically transferred.
The Self-Employed Health Insurance deduction is limited to your earnings. Meaning, you cannot deduct more than you earned. This is entered in the business expense section. So if you paid $10,000 in premiums but your profit was $6,000, your deduction would only be $6,000.
Taking Business Expense Deductions