Your immune system works best when the basics are covered: sleep, food, movement and a few key nutrients. No food or supplement “boosts” immunity like a switch, and nothing here prevents or treats infections. But some remedies have a long tradition and a little research behind them for everyday colds.
Get medical help first if…
- You have trouble breathing, chest pain, confusion, or lips turning blue: call 911.
- A fever lasts more than 3 days, goes above 39.4 °C (103 °F), or you feel worse after starting to improve.
- You’re pregnant, over 65, or have a long-term condition and catch the flu or COVID: antiviral medicine works best when started early, so call your doctor.
- Infections keep coming back.
Everyday steps with the best support
- Sleep 7–9 hours. People who sleep less catch colds more easily.
- Stay up to date on vaccines your doctor recommends.
- Wash your hands, especially before eating and touching your face.
- Eat plenty of vegetables, fruit, beans and some protein at each meal.
- Move most days, and keep alcohol low.
Remedies people traditionally use
| Remedy | What’s known | Safety |
|---|---|---|
| Vitamin D | Low levels are common in Canadian winters. Adults need 600 IU a day (800 IU over 70). | The upper limit is 4,000 IU a day unless your doctor advises more. |
| Zinc | Lozenges started within a day of cold symptoms may shorten a cold a little; results are mixed. | Stay under 40 mg a day long term. Never use zinc nasal sprays: they’ve caused loss of smell. Can cause nausea. |
| Elderberry | Small studies suggest it may shorten colds and flu slightly. | Use prepared products only: raw berries, leaves and stems can make you sick. Check first if you have an autoimmune condition. |
| Honey | Can ease a cough in adults and children over 1. | Never give honey to babies under 1. |
| Ginger and garlic | Traditional warming foods for colds. | Garlic supplements can thin the blood. |
Typical amounts are from product labels and general guidance, not a prescription. Check with your doctor or pharmacist before you start, especially if you take medication or have a health condition.
Supplements we like (affiliate)
Three supplements we like for immune support, sold by an outside company.
Sponsored link. If you buy through it, Clif may earn a commission at no extra cost to you. The claims on the seller’s page are theirs, not ours, and haven’t been checked by us. It’s not a substitute for seeing your doctor.
Related
- Health Testing (ask about a vitamin D test)
- Lymphatic protocol (Vault)
- Remedy Library
Sources
- Health Canada: vitamin D and calcium, Dietary Reference Intakes
- NIH Office of Dietary Supplements: vitamin D; zinc
- NCCIH: European elder; flu and colds
- US FDA: zinc nasal products and loss of smell
- Public Health Agency of Canada: flu symptoms and treatment
Affiliate notice: this page contains affiliate links. If you buy through them we may earn a commission at no extra cost to you. How we choose products.
Educational only, not medical advice. This information has not been evaluated by the FDA or Health Canada and is not intended to diagnose, treat, cure, or prevent any disease. Talk to your healthcare provider before starting any remedy, supplement, or detox, especially if you are pregnant, nursing, taking medication, or managing a health condition. Read our full Medical Disclaimer.