Can I deduct the added cost of my health insurance - purchased through my wife's employer plan?

Can I deduct my cost portion for health insurance? I have health insurance through my wife's employer. Her insurance cost is higher because I am on her plan. Can I deduct the adder, or the whole amount, or none? And does this deduction apply to health, dental, vision, any other? I am a sole proprietor of an LLC filing as an S-corp. My wife works for a large employer with health coverage benefits - I am the +1 in her "self + 1" health insurance through her plan.