Phosphatidylcholine

Major phospholipid component of cellular membranes and source of choline, essential for brain function, liver health, and cellular integrity

Scientific namePhosphatidylcholine (PC) FormulaC44H88NO8P Molecular weight790.15 g/mol CAS8002-43-5

85 absorption score

8 safety / 10

35 USD per month

6 documented interactions

Check it against something

Evidence level A

Phosphatidylcholine with:

82 out of 100

Works better together Compatible. Timing differs, so follow each supplement's own window.

Check it against your whole stack →

What it does

mechanism and evidence for each claim

Brain health and cognitive function

Supports memory, learning, and overall cognitive performance

Source of choline for acetylcholine synthesis and membrane structure Evidence B-grade 4-8 weeks for cognitive benefits

Liver health and fat metabolism

Supports healthy liver function and prevents fatty liver accumulation

Essential for hepatic fat metabolism and membrane integrity Evidence B-grade 6-12 weeks for liver benefits

Cellular membrane function and integrity

Major component of all cellular membranes affecting fluidity and function

Provides structural phospholipids for optimal membrane composition Evidence A-grade 4-8 weeks for membrane incorporation

Neurotransmitter production support

Essential source of choline for acetylcholine neurotransmitter synthesis

Provides choline substrate for cholinergic neurotransmission Evidence B-grade 2-6 weeks for neurotransmitter benefits

Cardiovascular health support

May support healthy cholesterol metabolism and cardiovascular function

Involved in lipoprotein formation and lipid transport Evidence C-grade 8-16 weeks for cardiovascular benefits

Others take these for the same thing

Same goal, different mechanism — check any of them against this one

Vitamin B12 (Cyanocobalamin) Energy & nerve support 250-1000 mcg A 70% Fish Oil (EPA/DHA) Heart & brain health 1-2g EPA/DHA A 85% L-Theanine Calm focus & stress relief 100-400mg B 90% Vitamin B8 (Inositol) Mental health & PCOS support 2-18g (condition dependent) B 95% SAM-e Mood support & liver health 400-800mg A 70% Lithium Orotate Mood & brain support 1-20mg C 60%

Every pair we checked

12 combinations scored by the engine

Phosphatidylcholine + Betaine HCl Low betaine increases demand for phosphatidylcholine Needs attention 52

Phosphatidylcholine + Caffeine No documented interaction either way No known interaction 70

Phosphatidylcholine + Creatine Monohydrate No documented interaction either way No known interaction 70

Phosphatidylcholine + Vitamin D3 No documented interaction either way No known interaction 70

Phosphatidylcholine + Calcium Carbonate No documented interaction either way No known interaction 70

Phosphatidylcholine + Whey Protein No documented interaction either way No known interaction 70

Phosphatidylcholine + Lactase No documented interaction either way No known interaction 70

Phosphatidylcholine + Bovine Collagen No documented interaction either way No known interaction 70

Phosphatidylcholine + DHA No documented interaction either way No known interaction 70

Phosphatidylcholine + Folate (5-MTHF) Improved choline metabolism and methylation support Works better together 78

Phosphatidylcholine + Omega-3 + Curcumin + Vitamin D Triple Anti-Inflammatory Formula Synergistic effects on brain health and membrane function Works better together 78

Phosphatidylcholine + Choline (Bitartrate) Enhanced cognitive benefits and optimal choline status Works better together 82

Dosage

With meals for absorption

Daily500-1,500 mg

Cognitive support500-1,500 mg daily

Liver health1,000-3,000 mg daily

Pregnancy support450-550 mg choline equivalent daily

General health500-1,000 mg daily

Upper limit 3500 mg NIH ODS

When to expect it

First Effects2-4 weeks for initial cognitive and membrane benefits

Peak Benefits8-12 weeks for maximum brain and liver benefits

Deficiency DevelopmentCholine deficiency can develop within weeks on deficient diet

Toxicity OnsetGenerally safe - minimal adverse effects at normal doses

How to measure it

$150-300

MarkerCholine levels, phospholipid status, liver function tests

OptimalAdequate choline levels, normal liver function markers

Deficient belowLow choline levels, elevated liver enzymes

FrequencyMonitor every 3-6 months during supplementation

What people actually reported to the FDA

CAERS, 5 reports naming it as the suspect

Most reported effects

Back pain 1

Tenderness 1

Thrombosis 1

Cystitis 1

Dehydration 1

Named as the suspect 5 reports of 9 that mention it at all

Serious outcome 75% hospitalisation, emergency room or worse

Other Serious or Important Medical Event4

Hospitalization3

Allergic Reaction2

Reports are voluntary and unverified — they record what someone experienced while taking something, not what the compound caused. Counts skew towards products people take a lot of, and a serious outcome is more likely to be reported than a mild one, so these are not rates. How we filter them →

What actually reaches you

The label counts the carrier, your body does not

Absorption Very high 85 of 100 · best absorbed form of this compound

Delivered daily 850 mg

Cost per 100 mg delivered $0.14 comparative — uses the absorption score, not a measured percentage

Works better with

3 documented

Choline

Enhanced cognitive benefits and optimal choline status

PC provides choline while additional choline optimizes levels · level A

Folate

Improved choline metabolism and methylation support

Folate spares choline in methylation reactions · level B

Omega 3 Fatty Acids

Synergistic effects on brain health and membrane function

Both support optimal membrane composition and brain function · level B

What not to take with Phosphatidylcholine

3 documented

Alcohol Excess

Excessive alcohol increases choline requirements and damages liver

Alcohol affects phospholipid metabolism and liver function · high significance

Betaine Deficiency

Low betaine increases demand for phosphatidylcholine

Both serve as methyl donors in methylation reactions · moderate significance

Oxidative Stress

High oxidative stress can damage phospholipid membranes

Free radicals attack phospholipid membrane components · moderate significance

Medication interactions

Discuss these with a pharmacist before combining

anticholinergic-medications Minor

May counteract anticholinergic effects through choline provision

What to do: Monitor for changes in medication effectiveness

lipid-lowering-medications Beneficial

May provide complementary benefits for lipid metabolism

What to do: Can be used alongside lipid medications

Available forms

bioavailability compared

Soy-derived phosphatidylcholine 85

Soy-derived phosphatidylcholine: Well-researched, High choline content, Good stability, Proven effectiveness

Food sources

before you supplement

Egg yolks Highest natural concentration of PC · 95

Organ meats (liver, brain) Rich source of phospholipids · 90

Soybeans and soy lecithin Good plant-based source · 80

Phosphatidylcholine supplements 500-3,000 mg standardized PC content · 85

Too little

deficiency signs

Phosphatidylcholine/choline deficiency symptoms:
Cognitive decline including memory and learning difficulties
Fatty liver disease and compromised liver function
Poor cellular membrane integrity and function
Reduced neurotransmitter production and brain function
Muscle damage and elevated liver enzymes
Compromised fetal brain development during pregnancy

Too much

toxicity signs

Generally safe with potential for mild adverse effects:
Digestive discomfort including nausea and loose stools
Fishy body odor with very high doses in susceptible individuals
Allergic reactions in soy or egg sensitive individuals
Safe for long-term use at appropriate doses

Who benefits most

brain-cognitive-health

Essential source of choline for brain function and memory

500-1,500 mg daily

liver-health-support

Prevents fatty liver and supports hepatic fat metabolism

1,000-3,000 mg daily

pregnant-breastfeeding-women

Essential for fetal brain development and maternal health

450-550 mg choline equivalent daily

cellular-membrane-optimization

Major component essential for all cellular membrane function

500-1,500 mg daily

aging-cognitive-support

Supports cognitive function and prevents age-related decline

750-2,000 mg daily

Where to buy it

compare forms first

Look for Phosphatidylcholine at 500-1,500 mg per serving. The form that matters here is Soy-derived phosphatidylcholine.

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What else affects it

Beyond other supplements

Alcohol excess

Excessive alcohol increases choline requirements and damages liver

Alcohol affects phospholipid metabolism and liver function

Oxidative stress

High oxidative stress can damage phospholipid membranes

Free radicals attack phospholipid membrane components

How it works

Major structural component of all cellular membranes
Primary dietary source of bioavailable choline for neurotransmitter synthesis
Essential for hepatic very low-density lipoprotein (VLDL) formation
Supports membrane fluidity and permeability regulation
Required for proper brain development and cognitive function
Involved in lipid transport and cholesterol metabolism

Key findings

what the evidence supports

Essential role in cellular membrane function and brain health
Important for liver health and prevention of fatty liver
Critical during pregnancy for fetal brain development
Good safety profile with minimal adverse effects

Sources: NIH Examine.com · data reviewed 2026-08-02

Compiled by Denis, who maintains this database and holds no medical qualification — every figure here is sourced or derived, never asserted. How we calculate it →

Common questions

What are the benefits of Phosphatidylcholine?

Documented effects: Brain health and cognitive function; Liver health and fat metabolism; Cellular membrane function and integrity; Neurotransmitter production support. Supports memory, learning, and overall cognitive performance

How much Phosphatidylcholine should you take per day?

The common daily range is 500-1,500 mg. By goal — cognitive support: 500-1,500 mg daily; liver health: 1,000-3,000 mg daily; pregnancy support: 450-550 mg choline equivalent daily; general health: 500-1,000 mg daily.

When is the best time to take Phosphatidylcholine?

With meals for absorption. First effects are typically reported within 2-4 weeks for initial cognitive and membrane benefits.

What are the side effects of Phosphatidylcholine?

At excessive doses: Generally safe with potential for mild adverse effects:, Digestive discomfort including nausea and loose stools, Fishy body odor with very high doses in susceptible individuals, Allergic reactions in soy or egg sensitive individuals, Safe for long-term use at appropriate doses. Safety rating at normal doses is 8 out of 10.

What should you not take with Phosphatidylcholine?

Separate it from Alcohol Excess, Betaine Deficiency, Oxidative Stress by two to four hours. Excessive alcohol increases choline requirements and damages liver

Does Phosphatidylcholine interact with medications?

Documented interactions with anticholinergic-medications, lipid-lowering-medications. Discuss these with a pharmacist before combining.

How much Phosphatidylcholine is too much?

The tolerable upper intake level is 3500 mg per day for adults, per NIH ODS. Above that, the risk of adverse effects rises: Generally safe with potential for mild adverse effects:, Digestive discomfort including nausea and loose stools, Fishy body odor with very high doses in susceptible individuals.

How do you know if you need Phosphatidylcholine?

The marker is Choline levels, phospholipid status, liver function tests, optimal range Adequate choline levels, normal liver function markers. Common deficiency signs: Phosphatidylcholine/choline deficiency symptoms:, Cognitive decline including memory and learning difficulties, Fatty liver disease and compromised liver function, Poor cellular membrane integrity and function.

Taken for

52 Brain & Focus

Caffeine · DHA · Fish Oil (EPA/DHA)