@onehottrail's natural testosterone claims, fact-checked

What did @onehottrail actually say?

The creator claims that LabCorp falsely elevated free testosterone readings on a specific test, and that this same error fooled carnivore diet advocate Paul Saladino into crediting his diet for "unnatural levels" of free testosterone. To prove it, the creator ran two tests 20 minutes apart, one at LabCorp and one at Quest, and found significantly different results. He also notes that Derek's supplement company (More Plates More Dates) pulled the specific test from its website entirely.

To the creator's credit, he opens by refusing to monetize the confusion. "All you have to do is give me your money is what I would say if I didn't have any morals," he says, then pivots to explaining the actual problem. That's a decent way to frame a legitimate concern about lab accuracy. Whether the underlying science holds up is a different question.

Does the science back this up?

Yes, actually, in meaningful ways. Free testosterone measurement is a genuinely contested area of clinical lab science, and the specific test the creator is referencing is almost certainly the analog immunoassay method, which has a well-documented accuracy problem.

The Endocrine Society published a position statement as far back as 2007 (Rosner et al., Journal of Clinical Endocrinology and Metabolism) explicitly stating that direct analog immunoassays for free testosterone are unreliable and should not be used clinically. The gold standard is equilibrium dialysis, which is what both LabCorp and Quest offer under specific test codes, but the two labs can still return different values depending on which dialysis protocol and mass spectrometry pipeline they run. A 2019 analysis by Travison et al. in the Journal of Clinical Endocrinology and Metabolism found meaningful inter-laboratory variation even between accredited labs using similar methods.

So the claim that a specific LabCorp test inflated free testosterone compared to Quest or compared to a calculated free testosterone formula is scientifically plausible. It is not a fringe position.

What did they get wrong (or right)?

The creator gets the core lab science right. Analog immunoassays are garbage for free testosterone, and inter-lab variation is real. Full credit there.

Where it gets murkier is the leap to "falsely elevated." Two tests taken 20 minutes apart on the same person is not a controlled study. Testosterone is pulsatile, meaning levels fluctuate throughout the day in short bursts driven by luteinizing hormone pulses. A 20-minute gap could introduce real biological variation, not just analytical error. Without knowing which specific LabCorp test code was used, whether it was the analog immunoassay or an equilibrium dialysis method, the comparison is hard to evaluate precisely.

The Paul Saladino example is compelling anecdote but still anecdote. There is no published data on Saladino's labs, and crediting a carnivore diet for high free testosterone has no solid mechanistic support in the literature. But the conclusion that his numbers were a lab artifact is not proven, just inferred. The creator presents it as settled. It is not.

The point about Derek's company pulling the test is circumstantial evidence, not confirmation. Companies remove products for many reasons.

What should you actually know?

If you are tracking testosterone for any clinical reason, the method used to measure free testosterone matters enormously. Equilibrium dialysis paired with mass spectrometry is the reference standard. Calculated free testosterone using total testosterone, sex hormone-binding globulin, and albumin is a reasonable second option, which is exactly what the creator demonstrates in the video.

Quest and LabCorp use different reference ranges and different internal protocols, so comparing absolute numbers across labs without knowing the methodology is not straightforward. If your free testosterone result looks unusually high or low, the right move is to ask your provider which specific test code was ordered, and whether it was analog immunoassay or equilibrium dialysis.

For anyone on a telehealth platform getting hormone panels ordered, this matters practically. A falsely elevated free testosterone could mask hypogonadism. A falsely low result could lead to unnecessary treatment. Neither outcome is harmless. Always ask for the test methodology, not just the number.