Pre-workout: what to look for on the caffeine label

If you are comparing pre-workout products at all, find the caffeine amount per serving — or notice if caffeine is hidden inside a proprietary blend that does not list an amount — and look for a recognizable testing mark. FDA does not approve dietary supplements before they are sold. ODS summarizes research on caffeine and also summarizes FDA’s statement that 400 mg/day caffeine does not usually have dangerous adverse effects for healthy adults; that is not a serving size we recommend, and it is not advice to consume that amount. This is not medical advice.

• Anyone looking for medical advice, a performance plan or a dose. We will not provide those.
• Teenagers and children. ODS cites the American Academy of Pediatrics warning that caffeine-containing energy drinks have no place in the diets of children or adolescents and are not suitable for use during routine physical activity.
• People who are pregnant, have a heart condition, or take stimulant medicines, unless a clinician is already involved.
• Shoppers who wanted a ranked list of tubs. This is a label checklist, not a product review.

The ODS health-professional exercise fact sheet describes caffeine as a stimulant that can reduce perceived pain and exertion and that, in studies, might enhance performance in some endurance and intermittent activities when taken before activity. Those are statements from a professional fact sheet, not a recommendation from us, and we are not repeating study protocols as a personal dose. The same sheet discusses safety observations, including insomnia, restlessness, nausea, vomiting, tachycardia and arrhythmia, and it notes a risk of death with a very large acute oral dose of pure caffeine. It also states that, for healthy adults, FDA says 400 mg/day caffeine does not usually have dangerous adverse effects, and it mentions other organizations’ different daily limits. Treat those as dated, attributed statements, not as a target we set.

ODS also notes that many sports supplements contain several ingredients in combinations that have not been studied as sold, and that some labels list a proprietary blend without the amount of each ingredient. That is the main label problem on a pre-workout tub: you cannot evaluate caffeine — or anything else — if the amount is not disclosed. The consumer companion sheet dated March 22, 2021 covers the same category in general terms and is the dated consumer document we already use on our creatine and protein guides.

FDA’s consumer pages state that the agency does not approve dietary supplements for safety or effectiveness, or approve their labeling, before they are sold. Manufacturers are responsible for safety and for truthful labeling. A Supplement Facts panel must list serving size, servings per container, and dietary ingredients and amounts per serving. A proprietary blend can still hide individual amounts unless the maker chooses to disclose them. If a product is marketed to treat, cure or prevent a disease, FDA treats it as a drug. Serving size is chosen by the manufacturer, so two scoops labeled “one serving” are not equivalent across brands.

NSF Certified for Sport is especially relevant here because NSF’s official page describes testing for banned stimulants and other substances when the product is taken at the recommended serving size. That still is not an FDA approval, and it is not a guarantee the product is appropriate for you. USP Verified remains a quality-verification mark for labeled amounts, specified contaminants, manufacturing and dissolution or disintegration. Confirm any mark in the certifier’s current database.

• The product is labeled as a dietary supplement and has a Supplement Facts panel.
• Caffeine is listed with an amount per serving, including caffeine from teas, guarana, yerba mate or other named sources, if those appear in the ingredients.
• A proprietary blend does not hide the caffeine figure. If the amount is missing, you cannot compare the product honestly.
• A recognizable testing mark is present and can be confirmed in a current database, especially if you are drug-tested.
• You have a plan to talk with a clinician before using it, and you already know how much caffeine you get from coffee, tea or other products the same day.