Supplements – what, why and how?

I’ve been asked so many times what I think about X supplement and approached by brands to promote new bizarre sounding pills claiming to solve all your training problems. Whilst some of them may have tentative supporting evidence, a lot don’t. I know the supplements market is a total minefield, so here are some of the most popular supplements out there, and evidence for and against them. Obviously research is always coming out saying X, Y or Z – I’ve included a lot of reviews and meta analyses to try to get a balanced view of the literature but always think critically about what people are trying to sell you. Just remember: there’s no magic pill that’ll suddenly make you fit or give you the perfect abs. Training is hard whatever supplements you take, and quite often it’s worth spending the £50 you spend on supplements on a personal training session or a few books on nutrition. Knowledge is power (literally in this case!).



Our muscles are made up of protein fibres, some of which are broken down and rebuilt each time we exercise. Protein supplements/shakes claim to enhance recovery of muscles and aid growth, thereby improving performance. However, the level of conflicting information (and the price of a lot of the supplements) warrants a closer look at the evidence of their efficacy.

The evidence: Looking at muscle recovery time, muscle soreness and muscle growth, the data are inconclusive. Some meta-analyses state that here’s no evidence to suggest that muscle recovery is faster when someone consumes protein before, after or during a workout. However, a lot of the studies looked at small sample sizes, and measures of ‘muscle soreness’ and recovery are often hard to quantify. There is, however, fairly strong evidence to suggest that people in a calorie deficit may benefit from taking protein supplements, and that protein can reduce muscle catabolism (break down) following a workout. Verdict: if you’re looking to build muscle and/or are in a calorie deficit, protein may help you out. However, if you’re looking to reduce DOMS or decrease recovery time, the jury is out on whether protein can help. Because of the mixed evidence, it may be worth trying it out, especially if you’re vegan or struggling to fit in enough protein in your diet and wanting to train hard. Find what works for you!



BCAAs or branched-chain amino acids are amino acids with side chains. There are three types: leucine, isoleucine and valine. The supplements are sold to increase protein synthesis, purportedly increasing muscle mass (even while in a calorie deficit) when paired with the right training. When taken regularly, supplementation may decrease fatigue during exercise by reducing the increase in serotonin during exercise, which contributes to fatigue.

The evidence: BCAAs are one of the most heavily studied supplements on the market. In terms of exercise (there are many other uses of BCAA supplementation), there are two main factors looked at: increased exercise performance and reduced muscle breakdown. The former has much mixed evidence, mostly suggesting that BCAAs are unlikely to significantly improve exercise performance. The latter, however, has much more evidence supporting it. Multiple studies show that supplementation before and after exercise reduce muscle breakdown after strenuous exercise, reducing delayed onset muscle soreness (DOMS).



Creatine is produced naturally in the body and stored predominantly in skeletal muscle. However, it is also sold as a supplement and marketed as helping to improve energy production for short duration, high intensity exercises. Theoretically, it is used by the body as a substrate to form ATP (the little packets of energy our body uses), and therefore supplementing with it means more ATP (energy) can be produced.

The evidence: Creatine is one of the more sound supplements on the market. According to one review paper, creatine is the most effective supplement to increase high-energy exercise capacity and muscle mass during training. As it turns out, of the 500 peer-reviewed papers looking into the effects of creatine, 70% concluded that it benefitted high intensity performance. However, when looking at more endurance exercises, the evidence is inconclusive, showing that if you want something for long-distance running, you should probably look elsewhere.

Nb/ There have been concerns that creatine supplementation may alter liver and kidney function, so if you have underlying conditions, creatine use should be avoided. In general though, it seems to be relatively safe!



Beta-alanine is a naturally occurring amino acid that is used by athletes to improve performance. Purported benefits include improving exercise capacity, building lean muscle mass and improving physical functions in the elderly.

The evidence: This supplement definitely shows some clear evidence that it can improve performance by reducing fatigue, thus making building muscle easier for those who take it. The benefits are seen most clearly in high intensity activities lasting 60s to 300s. However, the side effects are not widely studied but commonly experienced. If you’ve ever taken beta alanine you’ll probably be aware of the tingly feeling you can get, which is unpleasant at best. Few studies if any have looked into the safety of this supplement, and whilst it appears safe at recommended doses, take it at your own risk.



When we exercise we sweat, losing salts as well as water. Salts are important for our muscles to function properly and too few of them cause the body to cramp up. If you’re into endurance exercise or workout in hot places, chances are you’ve considered taking electrolytes. Electrolytes help replenish the salts lost when we sweat, thus keeping our muscles working properly, and are provided in a way that doesn’t give our body too much of any one type of salt (e.g. sodium). Supplementation aims to reduce heat stress, muscle cramps and aid rehydration.

The evidence: electrolyte supplementation has been shown to reduce cramping caused by electrolyte loss (lots of sweating), but cramping can still occur due to other factors. It reduces heat stress, so if you’re working out hard in a hot country (e.g. racing or competing abroad) this may be something to consider. If you’re not working out in extreme heat for extended periods of time, electrolytes are probably not required for your everyday training schedule.


I hope this helps clarify some things for you!


Choosing supplements to aid your workouts can be a minefield

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