What Supplements Endurance Athletes Waste Money On

If you're an endurance athlete and you've spent money on supplements that didn't move the needle — you're not imagining it. They didn't work. The reason comes down to one thing: the supplement industry is very good at selling products that sound right for athletes but don't match the actual physiology of endurance performance.

This article covers the ones I see athletes wasting money on most consistently — and exactly why they fall short.

Prefer to watch? The full video is below — or keep reading for the expanded breakdown.

Generic Pre-Workouts

Most commercial pre-workouts are built around stimulants — high-dose caffeine, beta-alanine, and proprietary blends with minimal endurance-specific evidence. The category was developed for short, high-intensity, gym-based training. It wasn't built for endurance sport, and using it as though it transfers is where the money gets wasted.

Here's what the majority of pre-workouts actually do physiologically — and it's a shorter list than the marketing suggests. They increase heart rate through caffeine's stimulant effect and produce vasodilation, temporarily improving blood flow. That's essentially the entire mechanism. 

Here's the thing: a proper warm-up does exactly the same thing. Five to ten minutes of progressive aerobic effort raises heart rate and drives vasodilation through the same physiological pathways — without the stimulant load, without the cost, and without the sleep disruption that comes from caffeine metabolizing later in the day.

Endurance performance is limited by fuel availability, hydration, aerobic efficiency, and recovery capacity. Stimulants don't address any of those. And for athletes already consuming caffeine regularly through coffee or other sources, the additional effect is significantly blunted by tolerance anyway. Warm up properly, eat adequately, and save the money.

BCAAs

Branched-chain amino acids are one of the most heavily marketed and most consistently oversold supplements in the industry.

The proposed benefit is muscle protein synthesis and recovery support. The problem is that BCAAs — leucine, isoleucine, and valine — are only three of the nine essential amino acids required to drive muscle protein synthesis through the mTOR pathway. Leucine is an important trigger, but the full downstream process requires all nine. Without the complete amino acid profile, you're pulling the trigger without completing the shot.

If you're consuming adequate total protein — approximately 0.7 to 1 gram per pound of body weight daily from complete sources — you already have the full essential amino acid profile available. Adding BCAAs on top provides essentially no additional benefit. The research is consistent on this point: complete protein outperforms BCAAs in every meaningful outcome measure for athletes eating adequate total protein.

If your total protein intake is genuinely insufficient, the fix is more complete protein — not an isolated three-amino-acid product layered on top of an inadequate foundation.

That being said, BCAAs may provide a convenient source of leucine-rich amino acids around training that can help support muscle protein turnover and recovery, particularly during prolonged or high-volume exercise, in a pinch.

But I wouldn't rely on them solely without looking at the entire diet. 

Fat Burners

This category is almost entirely stimulant-based — elevated caffeine, synephrine, or similar compounds that raise heart rate, suppress appetite, and create a perception of increased energy expenditure.

For endurance athletes, these products aren't just ineffective — they actively impair performance and recovery. Elevated sympathetic nervous system activation directly conflicts with the parasympathetic recovery state the body needs between sessions. They disrupt sleep. And they don't address the actual determinants of body composition in endurance athletes, which are energy availability, hormonal health, and training-recovery balance. A stimulant product addresses none of those underlying drivers.

In athletes already under hormonal stress from high training loads — the exact population covered throughout this site's hormone and RED-S series — adding a stimulant burden on top of an already taxed system makes the picture worse, not better.

Detox Products

This category deserves direct attention because the marketing is sophisticated, and the basic premise is physiologically unsound.

Juice cleanses, detox supplements, liver complexes, colon cleanse protocols — the core claim is that these remove accumulated toxins, reset metabolism, and enhance recovery. It's compelling language. It's not how human physiology actually works.

Your body has a highly sophisticated, continuously operating detoxification system — primarily the liver, kidneys, and lymphatic system — that processes and eliminates metabolic waste on an ongoing basis. These systems don't require periodic resetting. They don't accumulate a backlog of toxins that a supplement or juice regimen can clear.

What detox protocols actually do is impose significant caloric restriction. For endurance athletes, this is directly counterproductive. As covered in detail in the RED-S series, chronic energy insufficiency suppresses hormones, impairs recovery, reduces immune function, and disrupts bone remodeling. A multi-day juice cleanse before a training block is essentially a self-induced period of energy deficiency. You're not cleaning your system. You're depleting it.

If liver or kidney health is a genuine concern, that's a specific medical conversation with appropriate testing — not a supplement category to self-treat with.  Liver-supportive nutrients such as milk thistle, NAC, and phosphatidylcholine may help support normal antioxidant defenses, hepatocyte function, and healthy liver detoxification pathways.

Electrolyte and Energy Drinks for Every Workout

Electrolyte and energy drinks genuinely have a place in endurance performance. The problem is indiscriminate use across all sessions regardless of duration, intensity, or conditions.

For sessions under 60 to 75 minutes at moderate intensity in temperate conditions, a well-fueled athlete does not meaningfully benefit from electrolyte drinks or carbohydrate products during the session. Water is sufficient. The glycogen stores and electrolyte status a well-fueled athlete brings into a short session simply aren't significantly depleted by that effort.

Where these products become genuinely valuable is in sessions exceeding 75 to 90 minutes — particularly at higher intensities, in heat, or across multiple sessions in a day. Sodium, potassium, and magnesium replacement matters during long efforts. Carbohydrate delivery during prolonged high-intensity work meaningfully supports performance. In those contexts, a quality electrolyte product is a legitimate and worthwhile tool.

The problem is athletes consuming high-sugar electrolyte drinks during every 45-minute easy run — adding unnecessary caloric and sugar load, spending money on products their physiology doesn't need for that effort, and sometimes using these drinks as a substitute for eating adequate whole food around training.

The framework is simple: duration, intensity, and conditions determine whether these products are warranted. Short and easy — water. Long, hard, or hot — targeted electrolyte and carbohydrate support becomes genuinely useful.

Cheap Greens Powders

Greens powders have become one of the fastest-growing supplement categories. A scoop a day, the marketing says, provides multiple servings of vegetables, supports gut health, and fills nutritional gaps.

Here's the reality. Most commercial greens powders are significantly underdosed relative to the amounts of individual ingredients that research actually supports. Proprietary blend structures mean you often don't know how much of any single ingredient you're getting. And the processing required to create a shelf-stable powder degrades the bioavailability of heat-sensitive nutrients.

But the more fundamental problem is this: a greens powder doesn't come close to approximating what you get from a real diet of fruits and vegetables. Not even close. Whole fruits and vegetables provide thousands of phytonutrients, antioxidants, and bioactive compounds in combinations and concentrations that a processed powder cannot replicate.

There's also a critical element greens powders almost entirely lack: fiber. Dietary fiber from whole produce is essential for gut microbiome diversity, bowel regularity, cardiovascular health, and blood sugar regulation. A scoop of greens powder provides a negligible amount.

If your diet is lacking in produce, a greens powder is not the solution — it's a way to feel like you've addressed the problem without actually addressing it. Eat the vegetables. If micronutrient coverage specifically is the goal, a quality multivitamin is more transparent, better dosed, and less expensive than most greens powders on the market. And if you want to know specifically which nutrients you're actually deficient in, that's what targeted lab testing is for — which is exactly what the comprehensive testing article in this series covers.

The Pattern That Connects All of These

Every supplement on this list fails for the same underlying reason: it doesn't match the actual physiological limiting factors of endurance performance, or it's built on a premise that doesn't hold up to scrutiny.

The supplements that actually work — covered in the previous article in this series — target specific systems that genuinely limit endurance performance: energy production, inflammation resolution, connective tissue integrity, nervous system recovery, hormonal function. That framework is what determines whether a supplement belongs in your protocol or in the category covered here.

Before spending money on anything new, the question worth asking isn't "does this sound like it could help?" It's "what specific physiological system does this target, and is that system actually my limiting factor?" That question alone eliminates most of what's covered in this article.

Dr. Jason Barker is a naturopathic doctor with over 20 years of clinical experience working with endurance athletes. He is a two-time Ironman finisher and the founder of Natural Athlete Clinic. For individualized testing and supplement protocols built around your specific physiology, visit naturalathleteclinic.com.