If you take a daily vitamin and mineral supplement, you may want to stock up before August 1.
For after that date, the shelves of your local health food shop could be decidedly bare as tablets containing selenium yeast, boron, chromium picolinate and a further 300 nutrients are withdrawn from sale.
The European Food Supplements Directive, which comes into force at midnight on July 31, outlaws products containing ingredients not on its "positive list" of 140 permitted substances.
"The August legislation will have a major impact," says David Adams, director of the Health Food Manufacturers' Association (HFMA), which represents producers and suppliers such as Holland & Barrett, Solgar and Biocare.
Jenny Seagrove, now starring in BBC TV's Judge John Deed, a supporter of the campaign by the Consumers for Health Choice (CHC), says she is "angry, desolate and bewildered" by the forthcoming legislation.
The suggestion is that supplements fill the gaps left by a hurried diet and act as insurance against illness.
Campaigners argue that modern food is a shadow of what it was 50 years ago because of the way it is produced.
There are groups of people, however, highlighted in the 2004 National Diet and Nutrition Survey (a study carried out periodiocally by the Food Standards Agency), who do need supplements.
"It is true that many people don't eat the healthy balanced diet recommended for good health," says Lyndel Costain, a dietitian and spokesperson for the British Dietetic Association.
"Teenage girls are at higher risk of poor intakes of certain vitamins and minerals such as iron, calcium and magnesium.