The Last Word with Matt Cooper The Pros And Cons Of Vitamins And Other Supplements
Jan 8, 2026
Ilona Duffy, a GP from Monaghan, shares her insights on vitamins and supplements, offering medical advice on cautions around their use. Sarah Keogh, a registered dietitian and founder of Eat Well, discusses dietary deficiencies and the importance of vitamin D, especially in winter. They shed light on the pros and cons of creatine, the limited benefits of magnesium for sleep, and the necessity of checking dietary sources for hair health. The duo stresses informed decision-making regarding supplements, emphasizing evidence-based recommendations.
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Daily Vitamin D And Practical Multivitamin Use
- Take vitamin D daily in winter (about 15 micrograms for adults) because sunlight in Ireland is too weak from October to March.
- Use a basic multivitamin or fish oil if your diet isn't excellent, and consider a multivitamin for older adults to help reduce cognitive decline.
When To Supplement Vitamin B12
- Consider B12 supplementation if you follow a strict plant-based diet or have signs of malabsorption.
- Check with a clinician because low B12 can indicate celiac disease or other absorption problems.
Use Creatine Carefully And Get Expert Advice
- Use creatine cautiously and follow dosing guidance; excessive intake can harm kidneys.
- Seek evidence-based advice from a dietitian or GP rather than marketing or gym sellers before starting creatine.