The Most Overhyped Supplements of All Time | Episode 24

It’s here—the last episode of Dr. Layne Norton’s no-nonsense supplement series! In this finale, Layne takes a hard, evidence-based look at some of the most overhyped supplements in fitness and bodybuilding. He cuts through the marketing claims, examines the actual research, and tells you exactly what works, what doesn’t, and who (if anyone) should actually be spending money on these products.

In this episode, Layne covers:

BCAAs – Do they build muscle, boost strength, or speed recovery more than just eating enough total protein?
HMB – Why the “like deca” claims from the ’90s never panned out, and what it actually does (and doesn’t) do
Glutamine & Arginine – Poor bioavailability, gut-first metabolism, and why they rarely deliver the muscle-building or performance benefits promised
Ecdysterone & Turkesterone – The “natural steroid” hype meets high-quality human RCTs
Electrolytes – When they actually matter (and when plain water is sufficient)
“Better” Creatine forms (CEE, buffered creatine, HCl, etc.) vs. good old Creatine Monohydrate – spoiler: you’re usually just paying 2–4× more for the same (or worse) results

Layne breaks down the bold claims vs. reality for each supplement, explains what the science shows they actually do in the body, and identifies the very narrow populations who might see real benefit.

Stop wasting money on supplements that underdeliver. Focus on what actually moves the needle.

I. BCAA

A. Claims vs. Reality

Builds muscle – not compared to sufficient overall protein. 1 2 3
Strength – not compared to sufficient overall protein. 2 3
Fat Loss – they don’t increase fat loss. 4

B. What it actually does

Increases MPS but no more than sufficient protein. 5
Increases fat oxidation but not fat loss. 6
Decreases delayed onset muscle soreness, unclear if it is better than just eating more overall protein. 7

C. Specific populations that may benefit from supplementation

Vegans who struggle to consume enough high quality protein
Elderly
People suffering from wasting diseases

II. HMB

A. Claims vs. Reality

Original 90s claim was it was ‘like deca’ (an anabolic steroid)
Builds muscle – HMB may reduce muscle loss in wasting conditions such as cancer, but it does not build muscle or strength in healthy adults who resistance train. 8 9 10 11
Builds muscle in elderly – HMB increases lean mass in elderly, but it does NOT increase lean mass or improve body composition in elderly who already resistance train. 12 13 14 15

B. What it actually does

Reduces muscle protein breakdown through inhibition of the ubiquitin-proteosome pathway. 16 17 18
Increases MPS (though not as much as leucine). 19 20
May enhance muscle mass in conditions where muscle protein breakdown is elevated or there is muscle wasting.
Reduces muscle damage and delayed onset muscle soreness. 21

C. Specific populations that may benefit from supplementation

Elderly
Cancer patients undergoing treatment
People with wasting conditions due to elevated MPB

III. Glutamine

A. Claims vs. Reality

Any claims about what glutamine does peripherally outside of the splanchnic tissues is a tough sell due to it’s poor bioavailability. It is well absorbed by the enterocyte, but the majority of glutamine is extracted by the gut and liver as fuel, especially for the enterocyte with only ~10-20% of orally ingested glutamine surviving first pass metabolism. 22 23
Increases muscle mass and this claim was supported by the fact that people who suffer from wasting have increased rates of glutamine metabolism and infusions with glutamine may reduce muscle loss. 24 Research has repeatedly demonstrated that supplemental glutamine does not increase muscle mass or any measure of performance. 25
Prevents muscle wasting by reducing MPB. This is also not supported by the research literature. While infused glutamine may have an effect, oral glutamine did not decrease MPB. 26

B. What it actually does

May improve gut permeability at a high dose (~30g/day). 27
Any benefits will likely be isolated to the gut and liver due to low bioavailability
Some evidence it decreases DOMS but it is not a consistent effect and there are better options with more proven track record. 28 29

C. Specific populations that may benefit from supplementation

Those with increased gut permeability

IV. Arginine

A. Claims vs. Reality

Most claims around arginine supplementation are built on a foundational axis that arginine is the precursor to nitric oxide (NO) production. More NO = better blood flow = more anabolic environment. While it is true that arginine is the precursor to NO, oral arginine has poor bioavailability and is mostly extracted by the splanchnic tissues and arginine supplemenetation does not reliably raise NO levels or improve blood flow. 30 31 32
Arginine supplementation can help build muscle and enhance strength. The reality is research consistently shows it does neither. There are few direct studies on muscle growth and the one study that demonstrated a growth effect from arginine was not placebo controlled and the statistics did not make a group x time comparison, only time, which is extremely odd and inappropriate to draw conclusions from. 34

B. What it actually does

May increase systemic growth hormone and IGF-1 but have the opposite effect by blunting the resistance exercise-induced rise in GH. 35 36 Either systemic changes in GH and IGF-1 are insufficient to result in hypertrophy. 37
May help with wound healing as arginine availability may be limited for NO production, collagen synthesis, and immune cell function, under those conditions. 38

C. Specific populations that may benefit from supplementation

Clinical conditions where arginine availability becomes limiting like wound healing

V. Ecdysterone and Turkesterone

A. Claims vs. Reality

Increases muscle mass and strength. Any studies demonstrating this provide no viable mechanism and are funded by supplement companies. The highest quality human RCTs show no effect on muscle growth, strength, or muscle. 39 40 41 42

B. What it actually does

Disrupts molting in bugs…

C. Specific populations that may benefit from supplementation

Plants who don’t want bugs to eat them…

VI. Electrolytes

A. Claims vs. Reality

“Water isn’t enough.” Most people are not dehydrated and those who are it is usually not due to a lack of electrolytes but rather a lack of fluid intake. 43 44 45
“Electrolytes help you absorb water better.” Most people already consume enough electrolytes for sufficient hydration, particularly sodium and while oral rehydration solutions (ORS) do help dehydrated people hydrate better, in most people who are not exercising or sweating excessively, water hydrates as well as ORS. 46 47
“Prevents cramping.” Very little evidence that electrolytes reduce the risk of muscle cramps and most cramps are driven by neuromuscular fatigue. 46 48
“Boosts performance.” Electrolytes do not ‘boost’ performance. They prevent a decline in performance in those that lose electrolytes during long duration exercise and excessive sweating but consuming electrolytes under non-dehydrating conditions does not improve performance relative to water alone. 49
“Helps with brain fog.” Absolutely no evidence to support this claim. Electrolyte supplementation does not improve cognitive function in people who aren’t dehydrated. 50
“Sugar free, no junk.” Electrolytes, particularly sodium, actually absorb and hydrate significantly better with a small amount of carbohydrate present as a hypotonic solution. 51

B. What it actually does

Replaces electrolytes lost in sweat during hot climates, intense exercise, or prolonged exercise. 47
Helps prevent fatigue during prolonged exercise, especially when paired with carbohydrate. 52
ORS improve rehydration, maintain plasma volume, and prevent hyponatremia, especially when paired with carbohydrate in a hypotonic solution. 53

C. Specific populations that may benefit from supplementation

People who work or exercise in hot climates
People who sweat excessively
People who exercise intensely for prolonged durations (>60 min continuously)

VII. Creatine Ethyl Ester (CEE), Buffered Creatine, Creatine HCl (CrHCl), and forms other than creatine monohydrate monohydrate (CM)

A. Claims vs. Reality

Better absorption – Nonsense. CM already has ~99% absorption. 54
Increases muscle creatine content better – NONSENSE. CM maximizes intramuscular creatine stores and no other version of creatine has been demonstrated to do it better including CEE, buffered creatine, and CrHCl. 55 56 57
Less water retention – Nonsense. No evidence to support this and the increase in body water and cellular hydration is likely one of the reasons creatine increases muscle and strength. 58 59 60
Lower conversion to creatinine – Nonsense and CEE actually has a greater conversion to creatinine compared to CM.⁵⁹
Less bloating and GI distress – No evidence to support this statement 59
More stable in stomach acid (buffered creatine) – CM already has excellent stability in stomach acid. 61

B. What it actually does

You pay 2-4x more for equally or less effective forms of creatine

C. Specific populations that may benefit from supplementation

People who like wasting money

References

Intro
BCAAs
HMB
Glutamine
Arginine
Ecdysterone and Turkesterone
Electrolytes
Alternate Forms of Creatine
Honorable Mentions
Outro