A cheap, fast-acting molecule the body makes and food supplies, phenylethylamine briefly lifts mood, drive, and focus within minutes, then fades almost immediately. Evidence for lasting benefit is modest and unproven. Everyday doses seem well tolerated, but combining it with anything that blocks its breakdown can push blood pressure dangerously high; long-term safety is unknown. (Full Review)

Protocol

Dose

100–500 mg

Oral powder or capsule; start low (~100–250 mg)

Timing

15–30 min before

Earlier in the day; late dosing risks insomnia

Frequency

Acute, as-needed

Up to 500 mg two to three times daily cited

Time to effect

Onset

~15 min

Mood, energy, and focus lift felt quickly

Duration

30–60 min

Effects fade within about an hour

Half-life

Minutes

Rapid breakdown drives as-needed dosing

Benefits

Low: Acute mood elevation

Speculative: Focus, energy & motivation; exercise-induced mood improvement; ADHD attention support; appetite suppression & weight management

Contraindications

Any MAO inhibitor (MAOI antidepressants, selegiline, moclobemide)

Uncontrolled hypertension (≥140/90 mmHg)

Cardiovascular disease, arrhythmia, or recent cardiac events

Bipolar or psychotic disorders

Anxiety or panic disorders

Pregnancy or breastfeeding

Key Interactions

MAO-inhibiting supplements (St. John's Wort, harmala/harmine, syrian rue)

Serotonergic & stimulant drugs (SSRIs, SNRIs, amphetamine, methylphenidate)

OTC sympathomimetics (pseudoephedrine, phenylephrine)

Additive stimulant supplements (caffeine, synephrine, hordenine, higenamine)

Risk & Side Effects

Medium: Hypertensive reaction when combined with MAO inhibitors

Low: Stimulant-type effects; headache and migraine trigger

Speculative: Blood pressure and heart rate elevation at high doses; adverse psychiatric effects; unknown long-term safety

Monitoring

Marker	Target	Why
Blood pressure	~110–125 / 70–80 mmHg	Detects pressor response and screens for pre-existing hypertension
Resting heart rate	~50–70 bpm	Flags stimulant-driven increases in heart rate
Body weight / waist	Stable to individual goal	Relevant only if used for appetite or weight goals

Cadence: Baseline before first dose; recheck ~30–60 min after early doses, after the first week, then every few months

Qualitative Assessment

Mood and sense of well-being in the first hour after a dose
Focus, motivation, and mental energy, and how long they last
Sleep quality, especially with afternoon or evening dosing
Anxiety, jitteriness, or palpitations as early warning signs to reduce or stop

Phenylethylamine for Health & Longevity

Protocol

Benefits

Risk & Side Effects

Monitoring

Qualitative Assessment