Am I able to claim expenses for my sons asthma like air purifiers, covers for beds etc. Also, can I claim the additional cost to purchase gluten free for him?

[TurboTaxSusan]

You can use this Canada Revenue Agency (CRA) page to look up different expenses and see if they are eligible to be claimed as medical expenses: Lines 33099 and 33199 – Eligible medical expenses you can claim on your tax return

If you are unsure if you can claim a medical expense, you can ask the CRA directly. If you are in Canada or the United States, you can call the CRA at 1-800-959-8281. If you are elsewhere, you can call 613-940-8495. This page has more ways to contact the CRA: Contact the Canada Revenue Agency 

If you have TurboTax Live Assist & Review, see this TurboTax FAQ to learn how to talk to a Tax Expert or book a review: In TurboTax Live Assist & Review, how do I talk to a tax expert?