The Medicines and Healthcare products Regulatory Agency (MHRA) has advised caution on the use of Ayurvedic medicines after it was alerted to cases of heavy metal poisoning.
The medicines which caused the poisoning had been obtained from the Indian sub-continent and brought back to the UK for self use.
All six cases of poisoning occurred over the past three to four years, most caused bylead. One case involved arsenic.
Patients were using them to treat diabetes, chronic fatigue syndrome and hypertension.
The MHRA has said patients should consult their GP before using the medicines.