How can I actually boost my immune system?
The unglamorous truth: the immune system is boosted by sleep, not products. Seven-plus hours, regular exercise, a varied fiber-rich diet, healthy weight, managed stress, no smoking, moderate alcohol and staying vaccinated outperform every capsule sold with the word immunity on it.
Correcting a real vitamin D deficiency helps; megadosing without deficiency does not, and vitamin C after a cold starts changes little.
Frequent genuine infections, ones needing antibiotics or hospitalization repeatedly, are a medical question about the immune system, not a supplement question. Everything else is lifestyle compounding quietly.
Source: NHS, common cold
See a doctor promptly if
- Blood pressure repeatedly at or above 180/120 mmHg, especially with headache, chest pain, breathlessness or visual change
- Unintentional weight loss, night sweats, or a lump anywhere that is new and persistent
- Any bleeding that is not expected, including blood in stool or urine, coughing blood, or bleeding after the menopause
- Chest pain or breathlessness on exertion, which needs assessment now rather than at your next checkup
- A change in a mole, a sore that has not healed in weeks, or a persistent cough lasting more than three weeks
Answered by the AskDoc Medical Team · Medically reviewed under our Medical Director, MBBS · How we review
If you are buying a thermometer
A basic digital stick thermometer is accurate and costs a few dollars. Forehead scanners are fine for quick checks on children; ear thermometers need good technique to read true.
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