Too much vitamin D can backfire — spot the warning signs and trim your dose
The NHS advises a daily 10 microgram vitamin D supplement from October to March, but overdoing it can cause symptoms such as excessive thirst and urination, nausea, stomach upset, headaches or brain fog, and new aches or cramps, which may indicate hypercalcaemia. With many people taking higher-dose products and some supplements delivering up to 12.5 times the safe limit, it’s easy to double up from tablets, sprays, gummies, or fortified foods. Use only one vitamin D source and consult a clinician if warning signs appear.










