L-Theanine
35 associated posts. These are attributed summaries; original text remains at the linked X post and in the local archive.
- @lowmegatron · 2025-10-12 original
The author lists substances and practices that he claims lower or block serotonin, including aspirin, L-theanine, thiamine, glycine, taurine, T3, ginger, cyproheptadine, vitamin E, magnesium, DHEA, progesterone, testosterone/DHT, lysine, and avoiding seed oils. The quoted context is a Ray Peat line about serotonin overproduction and hibernation.
Source summary and thread relationship - @lowmegatron · 2025-10-16 original
The author lists supplements, foods and habits they say protect against polyunsaturated fat (PUFA) and seed oil effects. The lists cover reducing lipid peroxidation, lowering free fatty acids and supporting glucuronidation and sulfation. The author also advises eating mostly saturated fats and avoiding high-PUFA oils. The embedded lowmegatron post has an overlapping saturated fat/PUFA list plus a note on olive oil.
Source summary and thread relationship - @lowmegatron · 2025-10-16 original
The author states that blocking the glucocorticoid receptor lowers glucose and insulin in obese, diabetic mice, and that receptor activation raises free fatty acids. They list interventions said to help lower cortisol. The embedded lowmegatron post quotes a suggestion that coffee's anti-diabetic effect involves inhibiting 11β-HSD1.
Source summary and thread relationship - @lowmegatron · 2025-10-23 original
Author claims negative ion generators lower serotonin and histamine, and that oceans and waterfalls naturally produce negative ions. Bullets and a Ray Peat quote say positive ions raise serotonin and negative ions reduce brain serotonin and histamine. The embedded lowmegatron post lists substances and practices said to lower or block serotonin.
Source summary and thread relationship - @lowmegatron · 2025-10-29 own thread
lowmegatron claims that cortisol, glucagon and adrenaline inhibit T4-to-T3 conversion, lowering T3 and raising reverse T3 in a vicious cycle. He lists common, easily corrected causes of high cortisol and adrenaline (poor sleep, too little carbohydrate, sodium, potassium, magnesium or calcium, fasting, chronic caloric restriction, noise, shallow breathing, black coffee on an empty stomach, constant stimulation). He suggests acerola vitamin C, L-theanine and glycine may help.
Source summary and thread relationship - @lowmegatron · 2025-11-06 original
The post shares a Ray Peat quotation on minimizing the harmful effects of serotonin through diet, light and specific agents. The quoted lowmegatron post lists compounds and practices said to lower or block serotonin.
Source summary and thread relationship - @lowmegatron · 2025-11-11 original
The post claims aspirin can boost dopamine and may help in Parkinson's. It says aspirin increases tyrosine hydroxylase, which is needed to make dopamine, and that this was shown in lab-grown brain cells and live mice. The embedded lowmegatron post lists substances and practices claimed to lower or block serotonin.
Source summary and thread relationship - @lowmegatron · 2025-11-12 original
The author claims polyunsaturated fats such as linoleic and arachidonic acid interfere with vitamin D binding to DBP, while saturated fats do not. The embedded lowmegatron post lists strategies to protect against seed oils and polyunsaturated fats, including supplements, foods and fats to eat or avoid.
Source summary and thread relationship - @lowmegatron · 2025-11-21 original
The post author says endotoxin raises cortisol and that chronically elevated cortisol can cause low testosterone, weight gain, insulin resistance, type 2 diabetes and depression. They quote a human endotoxin-administration study reporting dose-related rises in inflammatory markers, cortisol and norepinephrine. The embedded quoted post from lowmegatron says blocking the glucocorticoid receptor lowers glucose and insulin in obese diabetic mice. It also lists many things it says help lower cortisol.
Source summary and thread relationship - @lowmegatron · 2025-11-26 original
The author lists nutrients, foods and other factors they say can help with high histamine, including correcting hypothyroidism and estrogen dominance. The embedded post from lowmegatron introduces a thread on histamine hacks and lists conditions in which histamine is implicated.
Source summary and thread relationship - @lowmegatron · 2025-12-02 own thread
lowmegatron gives a list of claimed ways to lower serotonin. He says PUFAs, estrogen, vitamin E or B1 deficiency and elevated free fatty acids raise it. He says zinc, niacinamide, aspirin, creatine, gelatin/glycine, vitamin E, vitamin D, L-theanine, inosine, coffee with food, calcium, magnesium, aged cascara sagrada, quinine, lysine and ginger lower it or help. He names antiserotonin drugs lisuride, cyproheptadine, memantine and famotidine.
Source summary and thread relationship - @lowmegatron · 2025-12-22 original
The author cites a paper suggesting that stress-related high histamine combined with vitamin C depletion damages arterial endothelium and predisposes to atherosclerosis and myocardial infarction. The author lists agents said to help lower histamine, depending on context, and common causes of elevated histamine.
Source summary and thread relationship - @lowmegatron · 2026-01-06 original
The author lists common causes of elevated histamine (such as high estrogen, endotoxin, hypothyroidism and nutrient deficiencies) and conditions in which histamine is implicated. They list things that 'can help', including vitamin E, progesterone, lidocaine, magnesium, l-theanine, thiamine, DAO and vitamin C. The embedded quoted post from lowmegatron opens a thread on 'histamine hacks' and lists the same implicated conditions.
Source summary and thread relationship - @lowmegatron · 2026-01-10 own thread
lowmegatron says L-theanine lowers the cortisol response to stress. The quoted study was a double-blind, placebo-controlled crossover in which subjective stress fell at one hour and cortisol response at three hours. The active treatment was a combination of L-theanine, alpha GPC, phosphatidylserine and chamomile, not theanine alone.
Source summary and thread relationship - @lowmegatron · 2026-02-04 own thread
lowmegatron claims that cortisol, glucagon and adrenaline inhibit thyroid hormone conversion, lowering T3 and raising reverse T3. He lists factors he says commonly raise cortisol and adrenaline, including poor sleep, too few carbohydrates, sodium, potassium, magnesium or calcium, fasting, chronic caloric restriction, noise, shallow breathing, black coffee on an empty stomach and constant stimulation. He suggests acerola vitamin C, L-theanine and glycine as possibly helpful.
Source summary and thread relationship - @lowmegatron · 2026-03-23 original
L-theanine may stabilize mast cells, lower stress and cortisol, reduce depression and anxiety, improve sleep and cognition, and decrease inflammatory markers and oxidative stress.
Source summary and thread relationship - @lowmegatron · 2026-04-02 original
Author describes L-theanine, a natural tea constituent, as inducing calm focused state via increased alpha brain waves. Defines alpha waves (meditation, relaxed wakefulness, reduced mental effort). Cites research showing L-theanine significantly increases alpha frequency band indicating mental relaxation without drowsiness and affects attention. Embedded quote from lowmegatron lists extensive L-theanine benefits including mast cell stabilization, stress/anxiety/depression reduction, sleep and cognitive improvement, and immune/inflammatory markers.
Source summary and thread relationship - @lowmegatron · 2026-04-03 original
Author explains mechanism by which tea consumption reduces cold and flu risk via L-theanine priming of Vγ2Vδ2 T cells to increase IFN-γ production. Cites human study showing 30% reduction in cold/flu incidence with L-theanine and EGCG supplementation, and notes both compounds have independent anti-infective properties. Includes embedded quoted post on glycine's role in collagen-based barrier immunity.
Source summary and thread relationship - @lowmegatron · 2026-04-09 original
Author explains paradoxical excitatory response to glycine in some people via NMDA receptor activation, and proposes l-theanine as an alternative by dampening glutamate activity and supporting inhibitory balance.
Source summary and thread relationship - @lowmegatron · 2026-04-09 original
Author claims l-theanine improves gut barrier integrity and reduces inflammation via TLR4 inhibition; lists conditions associated with upregulated TLR4, noting research was conducted in pigs and clarifying that blood DAO indicates gut leakiness rather than gut DAO levels.
Source summary and thread relationship - @lowmegatron · 2026-05-29 original
Post explains that chronic stress enlarges adrenal glands and increases glucocorticoid output, and that l-theanine prevents adrenal hypertrophy and stress-related behavioral depression in mice under confrontational stress. Cites detailed mouse study and references Hans Selye's General Adaptation Syndrome. Embedded quote lists multiple purported l-theanine benefits.
Source summary and thread relationship - @lowmegatron · 2026-06-01 original
Practical tips for lowering prolactin and serotonin through thyroid optimization, nutrient status, dietary fat composition, light exposure, supplements, and specific compounds; includes embedded quote on cyproheptadine mechanism for SSRI sexual dysfunction.
Source summary and thread relationship - @lowmegatron · 2026-06-01 original
Explanation of reverse T3 elevation as stress marker; cortisol and other counterregulatory hormones shift T4 conversion toward rT3 while raising free fatty acids that impair thyroid function; lists interventions to lower cortisol and suggests T3:T4 ratio optimization in levothyroxine users.
Source summary and thread relationship - @lowmegatron · 2026-06-01 original
Evidence-based review of cortisol's role in glucose dysregulation in diabetes; cites clinical and animal studies showing cortisol effects on blood sugar, insulin resistance, and reversal with glucocorticoid receptor blockade; discusses mechanisms and dietary strategies affecting cortisol.
Source summary and thread relationship - @lowmegatron · 2026-06-08 original
Personal anecdote of using topical progesterone to rapidly calm a severely distressed woman who had been drinking heavily and exhibiting aggressive behavior, after other supplements (magnesium, l-theanine, taurine) showed limited effect.
Source summary and thread relationship - @lowmegatron · 2026-06-16 own thread
lowmegatron claims cortisol, glucagon and adrenaline inhibit T4-to-T3 conversion and raise reverse T3. He lists modifiable causes of high cortisol and adrenaline: poor sleep, too few carbs, sodium, potassium, magnesium or calcium, fasting, chronic caloric restriction, noise, shallow breathing, black coffee on an empty stomach, and constant stimulation. He suggests acerola vitamin C, L-theanine and glycine may help.
Source summary and thread relationship - @lowmegatron · 2026-06-29 original
Author presents Ray Peat quote on hypothyroidism causing sodium and glucose deficiency, followed by embedded lowmegatron post on stress hormone suppression of thyroid hormone conversion and lifestyle factors affecting cortisol and adrenaline.
Source summary and thread relationship - @lowmegatron · 2026-07-01 original
List of compounds and conditions that lower or elevate histamine; embedded post by lowmegatron reporting personal experience with PEA for histamine symptoms and citing clinical/veterinary/animal evidence for PEA in mast cell disorders.
Source summary and thread relationship - @lowmegatron · 2026-07-03 original
lowmegatron says stinging nettles are a source of serotonin and histamine. He quotes text that nettle sting fluid contains formic acid, leukotrienes, acetylcholine, histamine and serotonin, with estimated serotonin per sting. The quoted parent lists things he says lower or raise histamine.
Source summary and thread relationship - @lowmegatron · 2026-08-04 original
Glycine 3g before bed improves subjective and objective sleep measures without altering sleep architecture; lists study-documented benefits including sleep latency reduction, deep sleep improvement, and daytime cognitive gains; notes paradoxical sensitivity in some people.
Source summary and thread relationship - @lowmegatron · 2026-08-05 original
Study findings on L-theanine reducing subjective stress and cortisol in double-blind placebo-controlled trial, with specific dose and co-ingredient details.
Source summary and thread relationship - @lowmegatron · 2026-08-12 own thread
The author claims L-theanine lowers the cortisol response to stress. Quotes a double-blind, placebo-controlled crossover study where subjective stress fell at one hour and cortisol response at three hours; the active treatment also contained alpha GPC, phosphatidylserine and chamomile, not just theanine.
Source summary and thread relationship - @lowmegatron · 2026-08-17 original
Author lists interventions claimed to decrease chronically elevated cortisol, including light exposure, dietary fats, micronutrients, supplements, and lifestyle factors. Quoted source discusses mold-induced stress lowering thyroid hormone T3 conversion and successful T3 supplementation in four patients previously unresponsive to levothyroxine.
Source summary and thread relationship - @lowmegatron · 2026-09-03 original
List of interventions for high histamine including thyroid correction, DAO enzyme, micronized PEA, progesterone, B vitamins, magnesium, L-theanine, copper, vitamins C and E, low PUFA diet, and hypoglycemia avoidance; author notes context-dependent efficacy. Embedded quote details personal PEA experimentation with symptom reduction and extensive research on PEA mechanisms in mast cell modulation.
Source summary and thread relationship - @lowmegatron · 2026-09-20 original
L-theanine reduces stress, cortisol, depression and anxiety while improving sleep, with cited evidence of reduction in Hamilton Depression Rating Scale scores and improvement in anxiety and sleep parameters.
Source summary and thread relationship