France's Consumer Watchdog Tested 120 Supplements for Fatigue. Most Fell Short

One in five French adults reports chronic fatigue, and many respond by buying supplements off pharmacy and supermarket shelves. In a special issue published October 10, the consumer magazine 60 Millions de consommateurs examined 120 of the most widely sold products marketed for energy and tiredness, according to franceinfo.

The magazine's core finding is a mismatch between who buys these products and who might actually benefit. Franceinfo reports that supplement users tend to be wealthier people already paying close attention to their diets, meaning the products often reach consumers with the least physiological need for them, while those with genuine deficiencies are less likely to be reached.

This matters because supplements occupy a lighter regulatory tier than medicines. Unlike drugs, franceinfo notes, they are not required to demonstrate efficacy or safety before sale; manufacturers must simply declare ingredients and dosages to authorities rather than prove clinical benefit.

60 Millions de consommateurs does not dismiss the category outright. The magazine acknowledges that some products can be useful during genuine periods of fatigue, while cautioning that the evidence justifying many marketing claims remains thin, per franceinfo's summary of the report.

Doctors do prescribe specific supplements for documented needs: vitamin D to help fix calcium, vitamin B9 for pregnant women, among others cited by franceinfo. A 2012 study from the Institut national de veille sanitaire, referenced by FemininBio, found a vitamin D deficit in more than 80% of French people, and separate data cited by the outlet suggest nearly 40% of women consume less than two-thirds of the recommended daily intake of magnesium. These are the kinds of measurable, population-level gaps that can justify targeted use, in contrast to blanket claims of curing everyday tiredness.

The investigation also flagged safety issues beyond simple inefficacy. Some tested products contained titanium dioxide (E171), an additive suspected of being pro-inflammatory and of harming the immune system, which is set to be banned from food use in January 2020, franceinfo reported. Others contained the Allura Red dye, suspected of worsening hyperactivity in children.

Dosage is a separate risk. Vitamin C taken in excess can damage the liver and kidneys, according to a summary of the magazine's findings published by HUDSON. Because supplements are sold without the same efficacy and safety testing required of pharmaceuticals, consumers have little way of independently verifying whether a given dose is therapeutic or simply excessive.

The stakes are not trivial in commercial terms. French consumers are the largest buyers of these products in Europe, spending nearly two billion euros on them last year, franceinfo noted, a scale that the magazine's investigators argue makes the gap between marketing promises and clinical evidence worth scrutinizing product by product rather than taking label claims at face value.