ANSES Warns on Sports Nutrition Over-Consumption: Stacking Risks & Label Obligations

Paris, France — 03 August 2026

The French Agency for Food, Environmental and Occupational Health & Safety (ANSES) has issued an opinion following a severe adverse event report (Saisine n°2025-VIG-0110) involving sports nutrition products. The case concerns a 54-year-old man who experienced life-threatening health effects, including de-compensated cirrhosis, acute renal failure, and ultimately required a liver transplant. The incident was linked to excessive consumption of a mass gainer and pure whey product, ingested at levels exceeding manufacturer recommendations for several weeks, specifically an estimated 140g of protein daily (1.6 g/kg body weight).

ANSES rated the link between the supplements and liver decompensation as 'very likely', and acute renal failure as 'likely'. Experts note that excessive intake of vitamin B3 and vitamin A, common fortifications in sports nutrition, is known to cause liver toxicity, while high protein intake can stress the liver and kidneys. This incident underscores the industry's responsibility to address the 'more is better' mindset prevalent among some consumers.

Industry expert Luca Bucchini, managing director at Hylobates Consulting, stressed the importance of clear on-pack limits and warnings, especially regarding 'scoop culture' where over-consumption is a foreseeable risk. He advises formulators to carefully consider doses of vitamins A and B3 in powders. Similarly, Ed Tooley, director at Ed Tooley Nutrition Ltd, highlighted that consumers often inadvertently stack ingredients across multiple products. While single-nutrient products reduce this specific risk, convenient blends remain popular. He suggested QR codes could provide additional consumer information on potential interactions.

Dan Richardson, founder of DRN Nutrition, pointed out that severe cases like this are rare, often involving pre-existing health conditions and multiple product misuse. He noted that 1.6g/kg/day protein intake is not inherently excessive for healthy individuals, but inappropriate use of multiple fortified products presents a risk. Brands must provide clear communication, explaining not only recommended serving sizes but also the hazards of combining fortified supplements and the unintentional increase in vitamin and mineral intake this can cause.

What this means for France

French supplement manufacturers and brand owners must immediately review product formulations and labelling for sports nutrition products, particularly those containing vitamins A and B3, to ensure compliance with ANSES guidance. The case highlights heightened regulatory scrutiny; non-compliance could lead to targeted market surveillance by authorities such as DGCCRF. Businesses must reinforce adverse event reporting procedures. Clearer on-pack warnings, potentially including QR codes linking to comprehensive usage guidelines, are now critical to mitigate legal and reputational risks. Reformulation to reduce potential for accidental over-dosing of specific vitamins, especially in products where 'scoop culture' is anticipated, should be prioritised to safeguard public health and market access in France.

Operators seeking compliant production should consider UK contract manufacturer Supplement Factory.