What are the best supplements for athletic performance in the UK?

The framework the institutes use: four classes by evidence and risk, and what sits in class A, the five performance aids, the three foods and the three medical supplements, each with the situation it is for

What are the best supplements for athletic performance in the UK is a question that a national sports institute has to answer for real athletes with real consequences, and the framework it uses to do so is more useful than any list, because it sorts every product by two things, the evidence and the risk, into four classes that decide what an athlete is given, what is trialled, what is ignored and what is forbidden. Class A holds the products with strong evidence for use in specific situations, and the phrase specific situations is the point: nothing in class A is for everyone all the time, each is for an event, a phase or a deficiency. The five performance aids in class A are the international consensus list. Caffeine at 3 to 6mg per kilogram, for the perception of effort in any event. Creatine at 3 to 5g a day, for repeated high-intensity efforts, strength and power sports and the work between sets, with its authorised claim. Beta-alanine, for efforts of one to four minutes. Sodium bicarbonate, for the same window, with a gut cost managed by protocol. Dietary nitrate from beetroot, for continuous efforts of five to thirty minutes and for recreational more than elite athletes. Each has a situation it is for and a situation it is not, and an institute's dietitian matches the aid to the athlete's event rather than handing out all five. Beside them in class A are three sports foods, which are supplements only in form: carbohydrate as drinks, gels and bars for efforts beyond about ninety minutes and for sessions close together; protein as powder for the athlete whose meals cannot carry the per-meal dose; and electrolytes for heavy sweat losses in heat. And three medical supplements, given on a blood test and not on a hunch: iron for the athlete ferritin finds low, vitamin D for the athlete whose winter level is low, and calcium for the athlete whose diet cannot supply it, each correcting a deficiency that limits performance and none boosting a replete athlete.

Class A, read whole, is five aids, three foods and three nutrients, and the striking thing about it is how little of the sports nutrition shelf it contains: a lifter's cupboard with creatine, caffeine, a protein powder for the shortfall, a winter vitamin D and a magnesium for the plate holds most of what a national institute gives its athletes, with the beta-alanine, bicarbonate and nitrate reserved for the events that last the minutes they cover.

Classes B, C and D: what is trialled with a reason, what is left alone, what is never touched, the tested athlete's extra step on every class A tub, the worked example, and the verdict

Class B holds products with emerging evidence that deserves further research, which an institute might trial with an individual athlete under supervision and with a reason: the polyphenols and tart cherry for recovery in congested fixture periods, collagen with vitamin C before loading for a tendon that is being rehabilitated, curcumin for a joint, fish oil for the concussion-prone sports, and a handful of others whose trials are promising and not yet replicated at the standard class A requires. A lifter reads class B as a list of things to try for a specific problem with a defined period and an honest expectation, and not as a list of things to take. Class C holds products with little evidence of benefit, and it is most of the shelf: the testosterone boosters, the fat burners, the branched-chain and essential amino acid blends in anyone eating enough protein, the nitric oxide boosters, the adaptogens and mushroom extracts sold for stress and cortisol, the greens powders, the glutamine and the HMB in trained athletes. An institute does not give class C to its athletes, not because any of it is dangerous but because none of it has shown a benefit worth the money or the pill burden, and a lifter who buys class C has bought the part of the shelf the professionals leave alone. Class D holds products that are banned or at high risk of contamination: the stimulants beyond caffeine, the prohormones and designer steroids sold as supplements, and anything bought from a source that cannot show a batch certificate, since under strict liability an athlete is responsible for whatever is in their sample and contaminated supplements have ended careers. The tested athlete adds one step to every class A tub that an untested lifter does not need: the lot number on the tub checked in a banned-substance programme's public database, with the record kept, because class A describes the evidence and not the contamination risk, and a class A creatine from an uncertified source is a class A molecule in a class D tub.

The worked example is class A's electrolyte line, for the claim it has: {FL}, 1500mg magnesium bisglycinate stated as 300mg elemental at 80% NRV, two capsules with the evening meal, carrying the authorised claims for electrolyte balance, normal muscle function, normal energy-yielding metabolism and the reduction of tiredness and fatigue, and no performance claim because none exists for it, batch tested for lead, mercury, arsenic and cadmium with the certificate on request, UK made under GMP and BRC, not enrolled in a banned-substance programme and stated as such so that a tested athlete treats it accordingly, 180 capsules for £19.99 at 22p a day. The verdict on the best supplements for athletic performance in the UK is the institutes' own: class A matched to the athlete's event and situation, five aids, three foods and three nutrients on a test; class B trialled with a reason and a defined period; class C left on the shelf where the professionals leave it; class D never touched; the lot number checked by anyone who can be tested; and the honest observation that the framework's first class is almost entirely what a sensible lifter's cupboard already holds, which is the quietest possible answer to a question the shelf wants answered loudly.

What to check on the label

Questions people also ask

What supplements do professional athletes actually take?

What their institute's framework puts in class A, matched to their event: caffeine, creatine, beta-alanine, sodium bicarbonate or dietary nitrate as the performance aid their duration calls for, carbohydrate, protein and electrolytes as sports foods for long efforts, close sessions and heat, and iron, vitamin D or calcium when a blood test finds them short; class B products such as collagen before tendon loading or tart cherry in congested fixtures are trialled with a reason, class C, which is most of the shelf, is not given, and class D, the stimulants, prohormones and anonymous-source tubs, is never touched under strict liability.

What is the AIS supplement classification?

A framework a national sports institute uses to decide what its athletes are given, grouping every product by evidence and risk into four classes: A, with strong evidence for use in specific situations, holding the five performance aids, the sports foods and the medical supplements given on a test; B, with emerging evidence deserving further research, trialled under supervision; C, with little evidence of benefit, which covers most of the commercial shelf; and D, banned or at high risk of contamination, which athletes avoid entirely; a lifter who sorts their cupboard by the same four classes has used the professionals' method.

Is creatine a class A supplement for athletes?

Yes, for the specific situations it covers: repeated high-intensity efforts, strength and power sports and the work between sets, where saturated phosphocreatine stores refill faster between bouts, at 3 to 5g a day with the authorised claim for performance in successive bursts of short-term high-intensity exercise and the strength meta-analysis behind it; it is not for continuous endurance beyond a minute, where its kilogram or so of stored water is a cost rather than a benefit, and a tested athlete checks the lot number of any creatine in a banned-substance programme's database, since class A describes evidence and not contamination.

Which performance supplements have little evidence?

Class C, which is most of what the shelf sells hardest: the testosterone boosters, audited at fifty with under a quarter showing any data; the fat burners, measured in grams over months; the branched-chain and essential amino acid blends in anyone eating enough protein; the nitric oxide boosters with a pump and no outcome trial; the adaptogens and mushroom extracts sold for stress and cortisol; the greens powders; glutamine; and HMB in trained athletes; an institute does not give any of it to its athletes, not because it is dangerous but because none has shown a benefit worth the money or the pill burden.

How do tested athletes avoid contaminated supplements?

By treating class D as a question about the source rather than the molecule: under strict liability an athlete is responsible for whatever is in their sample regardless of how it got there, contaminated supplements have produced anti-doping violations and ended careers, so every tub, including a class A creatine or caffeine, is bought from a product enrolled in a banned-substance certification programme, the lot number on the tub is checked in the programme's public database under the product's exact name, and the tub or a photograph of its lot number is kept with the record until any testing window has passed.

Sources

1. The Australian Institute of Sport supplement framework: supplements are grouped as A, with strong evidence for use in specific situations, B, with emerging evidence deserving further research, C, with little evidence of benefit, and D, banned or at high risk of contamination, the classification used by sports institutes to decide what athletes are given. https://www.ais.gov.au/nutrition/supplements
2. Maughan RJ, et al. IOC consensus statement: dietary supplements and the high-performance athlete. British Journal of Sports Medicine 2018;52(7):439-455: the performance supplements with good evidence are caffeine, creatine, nitrate, beta-alanine and sodium bicarbonate, with most other products lacking support. PubMed record
3. UK Anti-Doping guidance on supplements: strict liability means an athlete is responsible for any prohibited substance in their sample regardless of how it got there, contaminated supplements have produced UK anti-doping violations, and batch testing under a recognised programme is the risk-reduction step the agency describes while stating no supplement can be guaranteed free of prohibited substances. https://www.ukad.org.uk/athletes/supplements
4. Kreider RB, et al. International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. Journal of the International Society of Sports Nutrition 2017;14:18. PubMed record

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