# Do the Math Tryptophan Turkey Phenibut and Hair of the Dog

> Do the Math: Tryptophan, Turkey, Phenibut and Hair of the Dog is the arithmetic page. Four claims that circulate constantly — milk makes serotonin, turkey makes you sleepy, phenibut is a harmless…

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Last updated: 2026-10-04
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**Do the Math: Tryptophan, Turkey, Phenibut and Hair of the Dog** is the arithmetic page. Four claims that circulate constantly — **milk makes serotonin**, **turkey makes you sleepy**, **phenibut is a harmless supplement**, **hair of the dog cures a hangover** — and in each case the useful move is the same: **work out the actual quantity, and work out what else arrives with it**. Two of the four turn out to be true in a narrower form than advertised, one is false for a reason worth understanding, and one is a **genuine physical dependence** that people walk into because it is sold in a tub.

## 1. The transporter is the whole story

Before any of it: **tryptophan does not get into the brain on its own merits.** It crosses the blood-brain barrier on **LAT1**, a transporter it **shares with the other large neutral amino acids** — leucine, isoleucine, valine, tyrosine, phenylalanine, methionine, histidine.

**So what matters is never how much tryptophan you ate. It is the ratio:**

**Trp : ΣLNAA**

That single fact explains every result below, and it is why "high-tryptophan food" lists are nearly useless. **A protein-rich food raises tryptophan and raises its competitors at the same time** — often enough to leave the ratio **unchanged or worse**. See The Tryptamine Family and Endogenous Neurochemistry and Catecholamines Transporters and Monoamine Reuptake.

### The two things that actually move the ratio

- **Carbohydrate.** Insulin drives the branched-chain and other LNAAs into **skeletal muscle**. Tryptophan is largely **bound to albumin** and is taken up much less, so after a carbohydrate load the ratio **rises**. This is the Wurtman mechanism, and it is **why a carbohydrate meal is mildly sedating and a steak is not**.
- **A protein fraction with an unusually good ratio.** Which brings us to milk.

## 2. "Tryptamine from milk" — what is actually true

**The honest correction first:** you do not get **tryptamine** from milk in any meaningful quantity. Tryptamine is a **decarboxylation** product of tryptophan and is a **trace amine** in humans. What milk supplies is **tryptophan**, and the serotonin route is **Trp → 5-HTP (via tryptophan hydroxylase, which needs BH4) → serotonin** — see L-Methylfolate for why the cofactor is the bottleneck.

**What is genuinely established:**
- **α-lactalbumin**, a whey protein fraction of milk, has **the highest tryptophan content relative to its other large neutral amino acids of any common food protein** — roughly **4–6% tryptophan by weight**, several times that of casein or most meats.
- **Markus and colleagues** showed that a diet with α-lactalbumin raised the **plasma Trp:LNAA ratio by around 48%** compared with casein, and that in **stress-vulnerable subjects** this was accompanied by **reduced depressive mood under stress** and **improved cognitive performance**. A follow-up found **improved morning alertness** after an evening dose.
- **So the real sentence is:** "a specific whey fraction raises brain tryptophan availability by about half, with modest measured effects in people who were stressed." **That is a good, small, true result** — far more interesting than the version that gets repeated.
- **Caveats:** it is **α-lactalbumin**, not a glass of milk — whole milk's protein is ~80% casein, which has a **poor** ratio. Effects were **largest in stress-vulnerable subjects** and modest otherwise. And **warm milk at bedtime** is almost entirely **habit, warmth and ritual** — which, as the odour-hedonics section argues, is a real effect of a different kind, and should be labelled as such rather than dressed up as pharmacology.
- **⚠️ And the historical warning:** **L-tryptophan supplements were withdrawn in 1989** after an epidemic of **eosinophilia-myalgia syndrome** — over a thousand cases and dozens of deaths — traced to contaminants in one manufacturer's product. Tryptophan is back on sale and modern product is not implicated, but the episode is **the reference case for why "it's just an amino acid" is not a safety argument**. Also: **tryptophan or 5-HTP with any serotonergic drug risks serotonin syndrome** — see Inert Alone, Active Together §4.

## 3. Turkey — the arithmetic, which settles it

**The claim:** turkey is high in tryptophan, therefore the Thanksgiving nap.

### Step one: how much tryptophan is in turkey?

Roughly **250–350 mg per 100 g** of cooked turkey breast.

### Step two: is that high?

**No. It is unremarkable.** Per 100 g, **chicken is about the same**. **Pork, beef, salmon and tuna** are comparable or higher. **Parmesan** is roughly **double**. **Soybeans, pumpkin seeds, sesame and spirulina** are higher still per 100 g. **Turkey is not special, and the entire premise of the myth is a food-composition error.**

### Step three: what dose actually does anything?

Studies of **L-tryptophan** for sleep onset use **1 g and upward**; the sedative and mood literature generally works in the **1–5 g** range.

**To get 3 g of tryptophan from turkey you would need roughly 1 kilogram of turkey breast.** Not a portion — **a kilogram**.

### Step four: the step that actually kills the myth

**Even the kilogram would not work**, because turkey is **protein**. Eating it delivers tryptophan **together with all of its competitors** at LAT1. The **Trp:LNAA ratio does not rise — it typically falls.** **A high-protein meal reduces brain tryptophan availability.** That is the opposite of the claimed mechanism.

### So why is everyone asleep?

- **The size of the meal.** A large meal is sedating on its own.
- **The carbohydrate** — potatoes, stuffing, bread, pie — which **does** raise the Trp:LNAA ratio, by the insulin mechanism in §1. **If anything on the table makes you sleepy, it is the stuffing, not the bird.**
- **Alcohol.**
- **Postprandial physiology** and, honestly, **a day off and an armchair**.

**The turkey myth is the best short exercise in the library for why "contains X" is never an answer.** The questions are always **how much**, **compared to what**, and **what came with it**. Compare Molar Stoichiometry Powder Density and Tolerance Kinetics.

## 4. Phenibut — the one that is genuinely physically addictive

**⚠️ This section is a warning, and it is the most important on the page.**

### What it is

- **Phenibut** is **β-phenyl-γ-aminobutyric acid** — GABA with a phenyl ring added, which is what lets it cross the blood-brain barrier when GABA itself cannot.
- Developed in the **Soviet Union in the 1960s** (Perekalin's group, Leningrad), used clinically there for anxiety, and famously **carried in the Soyuz cosmonaut medical kit** because it is anxiolytic **without** being notably sedating or impairing performance.
- **Two mechanisms:** it is a **GABA-B receptor agonist** (like baclofen, which it closely resembles — baclofen is the 4-chlorophenyl analogue) **and** it blocks the **α2δ subunit of voltage-gated calcium channels**, which is the gabapentin and pregabalin target. **That dual action is why it does not feel like either drug alone.**

### Why it catches people

- It is **sold as a dietary supplement** in several countries, in **bulk powder**, with no prescription and no warning label. It is **not** an approved medicine in the US, UK, EU or Australia, and the **FDA issued warning letters in 2019** over its sale as a supplement.
- **Tolerance develops within days.** This is the trap. A dose that worked on Monday does less by Friday, and the natural response — take more — is exactly wrong.
- **Onset is slow** (two to four hours orally), which encourages redosing before the first dose has peaked. **Stacking doses blind is how overdoses happen.**

### The withdrawal, stated plainly

**Phenibut withdrawal is a GABAergic withdrawal, and it belongs in the same category as benzodiazepine and alcohol withdrawal — not in the same category as caffeine.** Documented features include:
- **severe rebound anxiety**, **insomnia** for days to weeks, **tremor**, **palpitations**, **derealisation**;
- **psychosis** and **hallucinations** in case reports;
- **seizures** in case reports.
- It has required **hospital admission**, and clinicians have managed it with **baclofen substitution and a slow taper** or with benzodiazepines, **exactly as they would alcohol withdrawal**.

**The harm-reduction content, which is the reason this is on the page rather than omitted:**
- **Do not stop abruptly from a sustained daily habit.** Abrupt discontinuation is where the seizures and psychosis appear. **Taper.**
- **Do not use it daily.** The tolerance curve means daily use is the mechanism of dependence, not an intensity of it.
- **Never combine with alcohol, benzodiazepines, opioids, or other GABAergics.** Additive respiratory depression — the pharmacodynamic synergy in Inert Alone, Active Together §8, which is the leading mechanism of combination overdose death.
- **Tell the hospital what it is.** Most emergency clinicians have not heard of it, and **"it is like baclofen and pregabalin together, and I have been taking it daily"** is the sentence that gets the right treatment.
- See Eugeroics Wakefulness and Sleep Pharmacology and Psychotomimetics Sedation and the Evolution of Psychiatry.

## 5. Coffee, alcohol and nicotine — subtler, and not equivalent

The operator's framing is right: these three are **more subtle** than phenibut, and they are **not subtle in the same way as each other**. The variable that separates them is **what withdrawal does**.

- **Caffeine** — an **adenosine A1/A2A antagonist**. Tolerance comes from **adenosine-receptor upregulation**, which is why a habitual drinker's morning coffee is largely **restoring baseline rather than exceeding it** — a result that survives blinded testing better than coffee drinkers like. Withdrawal is a **headache, fatigue and irritability at 12–24 hours**, peaking at a day or two. **Unpleasant. Not dangerous.** Note the A2A link to istradefylline and the Parkinson's epidemiology.
- **Nicotine** — **nicotinic acetylcholine receptor** agonist, with **receptor upregulation** driving tolerance. **The fastest-escalating dependence of the three**, with withdrawal that is **psychologically severe and physically safe**. **And the distinction that matters for harm reduction: nicotine is the addictive agent; combustion is what causes most of the mortality.** Conflating the two has made public-health messaging worse, not better.
- **Alcohol** — **GABA-A positive modulation plus NMDA antagonism**. Chronic use adapts in both directions: GABA-A downregulates, NMDA upregulates. **⚠️ Alcohol withdrawal is one of the very few withdrawals that can kill you** — **seizures** and **delirium tremens**, with meaningful mortality untreated. **A physically dependent drinker should not stop without medical cover.** This is the asymmetry people get backwards: **opioid withdrawal is agonising and rarely fatal; alcohol and GABAergic withdrawal is sometimes fatal.**

## 6. Hair of the dog

### Why it works, which is also why it is a bad idea

**There is a real mechanism**, and it is instructive:
- Alcoholic drinks contain **congeners**, including **methanol** — most in **dark spirits, brandy and whisky**, least in **vodka and gin**.
- **Methanol** is itself fairly harmless. **Alcohol dehydrogenase** converts it to **formaldehyde** and then **formic acid**, which are not, and which correlate with hangover severity.
- **Ethanol competes for the same enzyme** — with far higher affinity. So **drinking more ethanol delays methanol metabolism** and postpones the formic-acid load. (This is the **same principle** as the clinical treatment of actual methanol poisoning, where **ethanol or fomepizole** is given as an ADH competitor. Mechanistically identical, therapeutically nothing alike.)
- **So "hair of the dog" does not cure anything. It defers.** And in a **physically dependent** drinker, a morning drink is not a remedy at all — it is **relieving early withdrawal**, which is the beginning of a day-drinking cycle and a diagnostic sign in its own right.

### What the evidence supports

Honestly: **not much, and nothing cures a hangover.**
- **Time** and **sleep** are the only things that reliably work.
- **Water and electrolytes** for the diuresis. **Food**, particularly carbohydrate, for the hypoglycaemia.
- **An NSAID** — ibuprofen, aspirin, naproxen — for the headache and the prostaglandin component.
- **⚠️ NOT paracetamol / acetaminophen.** Alcohol induces **CYP2E1** and **depletes glutathione**, which is exactly the combination that turns paracetamol's **NAPQI** metabolite into liver injury. **This is the single most dangerous ordinary drug combination in the library** — see Inert Alone, Active Together §4.
- **Clear spirits over dark** genuinely reduces congener load, with blinded studies to back it (bourbon vs vodka).
- **Prickly pear (*Opuntia*)** extract has a small randomised trial showing reduced nausea and dry mouth; **mechanism is probably anti-inflammatory** and the effect is small. **Plausible, not established.**
- **What does not work:** more coffee (adds diuresis), "detox" products, B-vitamin megadoses, and anything claiming to "flush" alcohol. **Elimination is zero-order at about one standard drink per hour and nothing speeds it up.**

### The recipes, as culture

Worth having because they are **real traditions** and because almost all of them are **salt, acid, capsaicin, broth and carbohydrate** — i.e. **rehydration and food wearing a costume**:
- **Bloody Mary** / **Michelada** — tomato (salt, potassium, acid), capsaicin, and the alcohol that does the deferring.
- **Prairie Oyster** — raw egg, Worcestershire, hot sauce, vinegar. **Raw egg carries a *Salmonella* risk**, and the cysteine story is folklore.
- **Fernet-Branca** and **Underberg** — bitter amari, traditionally digestive, and the bitters lineage is on Spiced Wine, Bitters and the Colas.
- **The broth tradition is the one with the best case**: Korean **haejangguk** (literally "soup to chase a hangover"), Mexican **menudo** and **birria**, Vietnamese **phở**, Turkish **kelle paça**, Polish **żurek**, Russian **rassol** (pickle brine — genuinely an electrolyte solution). **Salt, water, fat, protein and warmth.** Which is, in fact, the evidence-based answer, arrived at by every culture that drinks.

## 7. Nootropics generally — the tiers

Since this is the page people arrive at from that word:
- **Has real evidence:** **caffeine** (and caffeine plus **L-theanine** for the jitter); **creatine**, particularly in **vegetarians and the sleep-deprived**, where the cognitive effect is measurable — see Creatine; **omega-3** in actual deficiency; **treating your sleep, hearing, blood pressure and exercise**, which beats every capsule discussed here.
- **Prescription, real effects, real costs:** **modafinil** and the stimulants. They work, and the literature on **well-rested high performers** shows **much smaller gains than users believe**, with **sleep architecture** and dependence as the price. See Eugeroics Wakefulness and Sleep Pharmacology.
- **Weak or specific-context evidence:** the **racetams** — see Racetams — and the **choline donors** — see Choline Donors. Mostly clinical-population data, thin in healthy adults.
- **The pattern to notice:** nearly every nootropic with a strong effect also has a **withdrawal or a tolerance curve**. **That is not a coincidence** — anything that pushes a receptor system gets pushed back on. **A substance with no tolerance and no withdrawal is usually a substance with no effect.**
- Stack Substances · The Amplification Framework · Building Brains · Brain Balance · Chemistry and Your Brain

## Sources

- Fernstrom J. D. and Wurtman R. J., "Brain serotonin content: physiological regulation by plasma neutral amino acids", *Science* 178 (1972) — the carbohydrate/LNAA mechanism.
- Markus C. R. et al., "The bovine protein α-lactalbumin increases the plasma ratio of tryptophan to the other large neutral amino acids, and in vulnerable subjects raises brain serotonin activity, reduces cortisol concentration, and improves mood under stress", *American Journal of Clinical Nutrition* 71 (2000).
- Markus C. R. et al., "Evening intake of α-lactalbumin increases plasma tryptophan availability and improves morning alertness and brain measures of attention", *AJCN* 81 (2005).
- Silber B. Y. and Schmitt J. A. J., "Effects of tryptophan loading on human cognition, mood, and sleep", *Neuroscience & Biobehavioral Reviews* 34 (2010).
- Swygert L. A. et al., "Eosinophilia-myalgia syndrome: results of national surveillance", *JAMA* 264 (1990).
- Lapin I., "Phenibut (β-phenyl-GABA): a tranquilizer and nootropic drug", *CNS Drug Reviews* 7 (2001).
- Ahuja T. et al., "Phenibut withdrawal: a case report and systematic review", and the clinical-toxicology case series on phenibut dependence and baclofen-assisted taper.
- US FDA warning letters on phenibut in dietary supplements (2019).
- Rogers P. J. et al., "Association of the anxiogenic and alerting effects of caffeine with ADORA2A and ADORA1 polymorphisms and habitual level of caffeine consumption", *Neuropsychopharmacology* 35 (2010).
- Rohsenow D. J. et al., "Intoxication with bourbon versus vodka: effects on hangover, sleep, and next-day neurocognitive performance", *Alcoholism: Clinical and Experimental Research* 34 (2010).
- Wiese J. et al., "Effect of *Opuntia ficus indica* on symptoms of the alcohol hangover", *Archives of Internal Medicine* 164 (2004).
- Zakhari S., "Overview: how is alcohol metabolized by the body?", *Alcohol Research & Health* 29 (2006).