Biohackers Are Ditching TB-500 After Cancer Warnings Hit Home

Biohackers Are Debating TB-500 Risk After One User Drops It From Their Stack

A Reddit user in the biohacking community posted about dropping TB-500 after further personal research raised concerns. The thread sparked debate about how biohackers weigh cancer-related risks against potential benefits.

Commenters pushed back on the fear. One user identifying as a cancer metastasis researcher called the logic behind dropping TB-500 flawed, saying the issue was being oversimplified—while still acknowledging there simply isn't enough data to call these peptides safe. Another commenter argued that people routinely accept risk from endocrine disruptors in skincare, glyphosate, food dyes, alcohol, and UV exposure without hesitation, questioning why peptides taken in the interest of health get treated differently. A third commenter pointed to immune system health as the key variable, arguing that a well-funded immune system already targets cancer cells daily.

The thread also raised a basic definitional question: whether users were even discussing the same compound, noting that most products labeled TB-500 actually contain TB-4, which appears in various commercial blends. No consensus emerged. The comments reflect a community navigating genuine uncertainty—no human trial data, no shared risk framework, and no clear answer on what they're even injecting.

Gobble's Take: When the debate starts with "are we even sure what's in this vial," that's your cue to sit out.

Source: r/Biohacking

Gut Tests Are Booming—But Your Results Are Harder to Interpret Than They Look

Dozens of companies now sell stool analysis kits with ambitious claims linking gut bacteria to your brain, weight, and longevity. The underlying science is real and growing. But significant gaps remain between what a result means statistically and what it means for you specifically.

A handful of organisms have accumulated strong evidence across multiple research methods. Faecalibacterium prausnitzii—probably the single most studied beneficial gut bacterium—produces butyrate, fuels colon cells, regulates inflammation, and is consistently depleted in inflammatory bowel disease, obesity, and depression across dozens of independent cohorts. It increases with dietary fiber from vegetables, legumes, and whole grains. Akkermansia muciniphila is associated with better metabolic health; a 2019 randomized controlled trial found pasteurized supplementation improved insulin sensitivity and reduced cardiovascular risk markers in overweight adults. Bifidobacterium species, well-characterized and supported by clinical trials for specific conditions, reliably increase with prebiotic fibers like inulin.

The catch: no single research method can fully answer the causation question. Animal findings frequently don't replicate in humans. Cohort studies can't isolate the microbiome from dozens of other variables. And two tests run on the same sample can produce different results depending on lab methods. One organism—Prevotella copri—illustrates the complexity perfectly: associated with healthy plant-rich diets in some studies, and with rheumatoid arthritis and gut inflammation in others.

Gobble's Take: The fiber and fermented foods your grandmother recommended are still outperforming the $300 kit.

Source: Dr. Glorioso Substack

Two Anti-Aging Breakthroughs: What Yeast and Mole Rats Reveal About Longevity

Afshine unpacks two findings that landed almost simultaneously. First: a research team led by Charalampos Rallis at Queen Mary, London tested Rapalink-1—a next-generation TOR inhibitor—in fission yeast. It extended chronological lifespan comparably to rapamycin, but with a more precise mechanism. Rapalink-1 upregulates agmatinases, triggering a feedback loop that further suppresses TORC1 activity. That link between agmatine metabolism and TOR opens a real possibility: dietary or microbiome interventions could amplify the drug's anti-aging effects.

Second: a landmark paper in Science revealed how subtle mutations in the naked mole rat's cGAS protein convert an immune sensor into a DNA repair booster. That tweak may help explain how naked mole rats live up to ~37 years—far beyond what their body size predicts—with near-complete cancer resistance. In mammalian cells, Rapalink-1 has already shown it can reduce DNA damage markers and lower p21 expression, suggesting biological activity beyond yeast. But the jump from cultured cells to systemic human aging remains vast, and Rapalink-1 is still largely untested for aging in humans.

The caveats are real: agmatine disruption could carry neuropsychiatric or vascular risks, and any chronic TOR modulation affects immunity, metabolism, and wound healing. Evolution already found these hacks—the hard part is borrowing them safely.

Gobble's Take: Your gut bacteria may already hold part of the anti-aging formula—the mole rat and the yeast just confirmed it's worth finding.

Source: Afshine Substack

Senolytics and NAD+: The Multi-System Science Behind Real Anti-Aging Breakthroughs

Longevity science has moved beyond wrinkle creams. Researchers now target the fundamental "hallmarks of aging"—nine biological processes that deteriorate over time. The most exciting recent work zeroes in on cellular senescence, mitochondrial dysfunction, and stem cell exhaustion. Senescent "zombie cells" linger in tissues, secreting inflammatory cytokines (the SASP) that degrade function and turn neighboring cells senescent too. In mice, senolytic drugs like Dasatinib plus Quercetin and Fisetin have cleared these cells, extending median lifespan, improving cardiac function, and reducing frailty. Early human trials are ongoing—for diabetic kidney disease and pulmonary fibrosis—but long-term safety and optimal dosing remain undefined. These are pharmaceutical agents, not daily supplements.

NAD+, a coenzyme critical for energy metabolism and DNA repair, declines dramatically with age. Restoring it in old mice improves mitochondrial function, insulin sensitivity, and cognitive performance. The main vehicles are precursors NMN and NR—supplements that bypass the rate-limited NAD+ synthesis pathway. Human studies confirm they safely raise blood NAD+ levels and show promising biomarkers like improved vascular function. Conclusive healthspan data is still forthcoming.

Underpinning all of it: resistance training is described as the single most potent senolytic and mitochondrial booster available—clearing damaged cells, stimulating mitophagy, and combating muscle loss. Sleep, protein sufficiency, and stress management complete the foundation no pill can replace.

Gobble's Take: The most powerful anti-aging intervention you can start today costs nothing—pick up heavy things and sleep eight hours.

Source: Faisal Substack

mTOR vs. AMPK: Flip the Switch, Unlock 20 Extra Years

William H. Bestermann Jr., MD, mapped a 60-year-old's bloodwork: sky-high mTOR from junk food and stress, crushing AMPK repair crews. Result? Accelerated rot at 1.5x normal speed.

The synergy: hit mTOR with rapamycin mimics (growth off), amp AMPK via exercise—trials show 25% lifespan extension in mice. Insulin spikes kill it; one meal-free day flips the switch, slashing inflammation 40%. Bryan Johnson lives this: his epigenetic age at 0.48, telomeres of a 12-year-old, by stacking basics first.

Integrated therapy isn't theory—it's the stack that beats solo hacks.

Gobble's Take: Skip meals to flip your survival switch; Johnson's teen biomarkers prove it trumps any pill alone.

Source: Bestermann Substack

In Case You Missed It

Yesterday's top stories:

• After 20 Years and Hundreds of Compounds, One Drug Keeps Winning: Rapamycin
• Two Cheap Amino Acids Matched Rapamycin's Best Results — and Also Fixed the Mice's Skin
• Scientists Have Named 12 Reasons You Age — and They're Building a Drug for Each One
• Bryan Johnson Spends $2M a Year on 11 Numbers — Here's the One That Matters Most