Lithium safe up to 85 mg/day
The European Chemical Agency concluded that up to 85 milligrams of lithium per day causes no long-term harm — 85 times the recommended 1 mg dose.
Snapshot · The Tucker Carlson Show
The Number One Way to Fight Alzheimer’s, Depression and Anxiety Before It’s Too Late
Explore episode
Jul 3, 2026
Where this was said
Autophagy, Lithium, and Cellular Immortality
At 1:14:43 · chapter starts 1:12:10
Nehls zooms out to the deepest biology: every neuron you are born with must last 100 years. Because neurons cannot be replaced (unlike hippocampal index neurons), they must self-maintain through autophagy — the process of digesting worn-out proteins and dysfunctional mitochondria before they accumulate as toxic debris. Autophagy is activated when the IMPASE enzyme is inhibited; magnesium activates IMPASE (like a gas pedal) and lithium inhibits it (like a brake). Homeostasis requires both. Fasting also promotes autophagy, but Nehls argues it works much better with adequate lithium. He traces this mechanism back to the last universal common ancestor — the first cell that ever existed — making autophagy and its lithium dependence as old as life itself. Tucker asks about fasting; Nehls confirms it is a powerful trigger, but lithium is the 'key that makes it actually work.'
Autophagy: The Oldest Survival Mechanism on Earth
Autophagy — the process by which cells digest their own damaged components — is the oldest cellular defense in life's history. Lithium activates it by inhibiting the IMPASE enzyme; without lithium, even fasting cannot fully engage it, leaving neurons to accumulate toxic debris.
Similar snapshots
High morning cortisol = cheat code
Making the first hour of your day high-cortisol and the last hour low-cortisol is described as the single most impactful daily habit for mood, focus, alertness, stress resilience, and sleep quality.
Sleep vs Ritalin attention effects equal
A Washington University in St. Louis study found that a great night's sleep produces attention-improvement effects effectively equal to Ritalin.
4–6 hours post-exercise focus boost
In the 4 to 6 hours after exercise, dopamine and norepinephrine are elevated, making you more alert and better able to focus — unless you've exercised to exhaustion.
Physiological sigh discovered 1930s
The physiological sigh — two big inhales followed by a full exhale — was discovered by physiologists in the 1930s and is the fastest way to reduce autonomic arousal.
10 deliberate exhales raise HRV significantly
Doing just 10 deliberate exhales throughout the day can significantly elevate heart rate variability by the evening, by repeatedly activating the vagal sinoatrial node pathway.
Nicotine performance dose: 3–6mg, max 2x/week
For nicotine to have a genuine cognitive-enhancing effect rather than merely rescuing withdrawal deficit, Huberman recommends using it only once or twice per week at 3–6 mg.
Vaping = higher total nicotine than smoking
Because vaping can be done anywhere and is more palatable, people consume far more nicotine via vaping than they ever did smoking, potentially making vaping more dangerous in aggregate despite being safer per puff.
BPC-157: 2 injections cleared shoulder pain
Huberman reported that two injections of approximately 100–200 micrograms of BPC-157 eliminated persistent shoulder pain that had resisted months of other interventions.
Pinealon: 2.5–3 hrs REM in 6 hrs sleep
Huberman reported that on nights he used the peptide pinealon, he achieved 2.5 to 3 hours of REM sleep inside 6 hours — an unusually high proportion normally only found in the final hours of longer sleep.
