Evidence-based·Last reviewed May 30, 2026·How we grade evidence

Betaine

Amino-acidAmino acid derivativeBest with a meal

Useful mainly for people with elevated homocysteine, particularly those with inadequate folate or B12 intake, or with homocystinuria.

Quick decision guide

May help most

People with elevated homocysteine, particularly those with inadequate folate or B12 intake, or with homocystinuria

Common dosing range

500–3,000 mg/day for homocysteine; 2,500 mg/day for exercise performance

When to expect effects

Weeks for homocysteine reduction; 4–6 weeks for exercise performance assessment

Watch out for

High doses may raise LDL cholesterol — monitor lipids with prolonged use above 3 g/day

What is it

Betaine, also called trimethylglycine (TMG), is a naturally occurring compound found in many plants and animals, particularly beets (from which it gets its name), spinach, wheat bran, and seafood. In the body, it functions as a methyl donor in one-carbon metabolism and as an osmolyte protecting cells from osmotic stress.

Is it worth it for you?

Use this as a quick fit check, not a diagnosis.

Worth considering if…

You have elevated plasma homocysteine, especially if B12 and folate are already optimized

You are a strength or power athlete seeking modest performance gains on top of a solid training base

You have homocystinuria (prescription dosing under clinician supervision)

Probably skip if…

You have elevated LDL or cardiovascular risk without lipid monitoring plan

You have trimethylaminuria — high doses produce fishy body odor

You are pregnant without clinician guidance

You expect homocysteine reduction alone to prevent cardiovascular events — this is a biomarker, not a proven CVD outcome

Evidence at a glance

Goal	Effect	Best fit	Time
homocysteine reduction Strong Evidence	Reduces plasma homocysteine by 10–20% in adults with elevated levels	Adults with hyperhomocysteinemia, especially when folate/B12 supplementation is already in place	Weeks
exercise performance (strength and power) Limited Evidence	Modest but consistent improvements in power output and work capacity in several RCTs	Trained athletes doing resistance or mixed-sport training	Weeks
body composition Limited Evidence	Small reductions in fat mass and modest muscle mass gains in some RCTs	Resistance-trained adults using betaine as an adjunct to structured training	Weeks to months
liver health (NAFLD/NASH) Mixed Evidence	Modest reductions in liver enzymes in small trials	Adults with non-alcoholic fatty liver disease and elevated liver enzymes	Months

homocysteine reduction

Strong Evidence

Effect: Reduces plasma homocysteine by 10–20% in adults with elevated levels
Best fit: Adults with hyperhomocysteinemia, especially when folate/B12 supplementation is already in place
Time: Weeks

exercise performance (strength and power)

Limited Evidence

Effect: Modest but consistent improvements in power output and work capacity in several RCTs
Best fit: Trained athletes doing resistance or mixed-sport training
Time: Weeks

body composition

Limited Evidence

Effect: Small reductions in fat mass and modest muscle mass gains in some RCTs
Best fit: Resistance-trained adults using betaine as an adjunct to structured training
Time: Weeks to months

liver health (NAFLD/NASH)

Mixed Evidence

Effect: Modest reductions in liver enzymes in small trials
Best fit: Adults with non-alcoholic fatty liver disease and elevated liver enzymes
Time: Months

Evidence for 4 uses

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

homocysteine reduction

Biomarker support

Strong Evidence

Betaine donates a methyl group to homocysteine via betaine-homocysteine methyltransferase (BHMT), converting it back to methionine. Multiple RCTs and meta-analyses confirm consistent, dose-dependent reduction in plasma homocysteine. Betaine is complementary to folate and B12 (which work through a different remethylation pathway); it is particularly useful when folate availability is limited. Homocysteine is a cardiovascular risk biomarker — betaine's direct effect on CVD outcomes has not been established.

Effect size

Reduces plasma homocysteine by 10–20% in adults with elevated levels

Time to effect

Weeks

Best fit

Adults with hyperhomocysteinemia, especially when folate/B12 supplementation is already in place

Less likely

Adults with normal homocysteine — little room for meaningful further reduction

Bottom line: Reliably lowers elevated homocysteine — a well-evidenced biomarker effect, though whether this reduces cardiovascular events is not proven.

SourceImani et al., 2019 — PubMed Lu et al., 2023 — PMC

exercise performance (strength and power)

Supplement benefit

Limited Evidence

Several RCTs of betaine anhydrous (2,500 mg/day) in resistance-trained athletes show improvements in sprint power, bench press volume, and work capacity compared to placebo. The proposed mechanism involves both osmolyte protection of muscle cells under hypertonic stress and creatine precursor effects. Meta-analytic pooling shows statistically significant but modest effect sizes; not all trials are positive.

Effect size

Modest but consistent improvements in power output and work capacity in several RCTs

Time to effect

Weeks

Best fit

Trained athletes doing resistance or mixed-sport training

Less likely

Sedentary individuals or endurance-only athletes — less evidence in these groups

Bottom line: A reasonable ergogenic with moderate trial support, best suited to athletes doing high-volume resistance or sprint training.

Evidence is mixed

Not all RCTs show benefit; effect sizes vary considerably. Positive results are most consistent for power output rather than absolute strength (1RM).

SourceZawieja et al., 2024 — PubMed· conflicting Nobari et al., 2021 — PMC· conflicting

SourceZawieja et al., 2024 — PubMed Nobari et al., 2021 — PMC

body composition

Supplement benefit

Limited Evidence

Some RCTs in resistance-trained subjects report small betaine-associated improvements in body fat percentage and lean mass compared to placebo. Effect sizes are small and not consistent across all trials. Changes in body composition are unlikely to be clinically meaningful independent of exercise and dietary context.

Effect size

Small reductions in fat mass and modest muscle mass gains in some RCTs

Time to effect

Weeks to months

Best fit

Resistance-trained adults using betaine as an adjunct to structured training

Bottom line: Possible modest body composition benefit in resistance-trained athletes; too small to matter as a standalone fat loss aid.

SourceCholewa et al., 2018 — PMC Nobari et al., 2021 — PMC

liver health (NAFLD/NASH)

Biomarker support

Mixed Evidence

Betaine's role in hepatic methylation and osmolyte balance has prompted small trials in non-alcoholic fatty liver disease. Some studies report reductions in ALT and AST and modest improvement in liver histology. Evidence is preliminary; studies are small, short-term, and methodologically heterogeneous. Betaine is not a substitute for lifestyle intervention as first-line NAFLD treatment.

Effect size

Modest reductions in liver enzymes in small trials

Time to effect

Months

Best fit

Adults with non-alcoholic fatty liver disease and elevated liver enzymes

Bottom line: Early-stage evidence only — not ready to recommend as a NAFLD intervention.

SourceTrujillo-Gonzalez et al., 2026 — PMC Miglio et al., 2000 — PubMed

How it works

Betaine donates methyl groups to homocysteine, converting it to methionine via the enzyme betaine-homocysteine methyltransferase (BHMT). This pathway lowers blood homocysteine, an amino acid linked to cardiovascular disease risk when elevated. Folate, vitamin B12, and betaine all participate in homocysteine remethylation; betaine becomes more important when folate intake is inadequate. As an osmolyte, betaine helps cells maintain volume under stress, accumulating in tissues like the kidney and brain. This protective function may underlie some of its effects on cellular function and exercise performance, where it may improve muscle endurance and power output. Betaine is also a precursor to dimethylglycine (DMG), which then becomes sarcosine and finally glycine, contributing to broader methylation and one-carbon metabolism. The body produces some betaine from choline, but dietary intake supplements this internal production.

How to take it

1. Typical dose

1,500–3,000 mg/day for homocysteine; 2,500 mg/day for exercise

2. Timing

With meals at any consistent time of day; pre-workout timing for performance use

3. With food

With food — reduces GI upset

4. Split dosing

Split doses above 3 g into 2–3 administrations across the day

5. How long to try

6–12 weeks for homocysteine; 4–6 weeks for exercise performance assessment

What to track

Plasma homocysteine if the primary goal

LDL and total cholesterol at baseline and after 8–12 weeks

Exercise performance metrics (strength, power output)

Body odor (trimethylamine signal at high doses)

3 commercial forms

Compare the main delivery options and what they’re best suited for.

Betaine anhydrous (TMG)

Standard form for general supplementation. Available as powder or capsules.

Most common supplement form; well absorbed.

Betaine HCl (with hydrochloric acid)

Different use case (gastric acid support), not interchangeable with betaine anhydrous for methylation.

Combined with HCl; used for digestive support, not methylation.

Prescription betaine anhydrous (Cystadane)

Used in medical settings for genetic homocystinuria.

FDA-approved for homocystinuria at very high doses.

Safety

Know the common side effects, key cautions, and who should avoid it.

Common side effects

Mild GI upset and nauseaFishy body odor at high doses (trimethylamine production)Potential LDL rise with prolonged high-dose use

Who should avoid it

People with trimethylaminuria
People with elevated LDL without lipid monitoring
People with kidney disease — consult clinician

Pregnancy & breastfeeding

Food-level intake is safe; high-dose supplementation during pregnancy lacks safety data — consult a clinician.

Interactions

folate and vitamin B12Minor

Synergistic homocysteine-lowering; combination is rational and well-studied

lipid-lowering medicationsMinor

Betaine may raise total cholesterol or LDL at high doses — monitor lipids if combining with statins or fibrates

Protocols featuring Betaine

Evidence-backed routines where Betaine plays a role.

NAD+ & Cellular Energy

longevity

NAD+ (nicotinamide adenine dinucleotide) is a coenzyme essential for mitochondrial energy production, DNA repair (via sirtuins and PARPs), and cellular signaling. NAD+ levels decline measurably with age — roughly 50% by middle age in some tissues. The 2020s have seen explosive interest in NAD+ precursors (NMN, NR) as longevity interventions, popularized by researchers like David Sinclair. The honest framing: NAD+ precursors RELIABLY raise blood NAD+ levels in human trials. What''s less clear is whether this translates to meaningful longevity, cognitive, or healthspan endpoints in humans — most positive evidence is from animal models or small short-duration human trials. This stack is for adults interested in cellular energy support, especially over 40 — with the explicit caveat that this is experimental territory relative to the rest of the library. Foundational Longevity remains the better starting point for general healthspan; this protocol is for adults who want to specifically explore the NAD+ pathway.

Food sources

Food	Amount	%DV
Beets	1/2 cup cooked	—
Spinach	1 cup cooked	—
Wheat bran	1/4 cup	—
Quinoa	1 cup cooked	—
Shrimp	3 oz	—
Sweet potatoes	1 medium	—
Whole grain bread	1 slice	—
Lamb	3 oz	—

Beets

Amount: 1/2 cup cooked
%DV: —

Spinach

Amount: 1 cup cooked
%DV: —

Wheat bran

Amount: 1/4 cup
%DV: —

Quinoa

Amount: 1 cup cooked
%DV: —

Shrimp

Amount: 3 oz
%DV: —

Sweet potatoes

Amount: 1 medium
%DV: —

Whole grain bread

Amount: 1 slice
%DV: —

Lamb

Amount: 3 oz
%DV: —

Choosing a product

What to look for on the label — and what to be skeptical of.

Look for…

Betaine anhydrous specified (most studied form for performance)

Dose in grams clearly stated

No hidden ingredients in blended performance products

Third-party tested for purity

Be skeptical of…

'Burns fat directly'

'Proven to build muscle'

'Detoxes the liver'

'Prevents heart disease by lowering homocysteine'

Frequently asked questions

What's the difference between betaine and betaine HCl?⌄

Betaine anhydrous (TMG) is used for methylation and homocysteine reduction. Betaine HCl is combined with hydrochloric acid and used as a digestive aid for low stomach acid. They are not interchangeable for most purposes.

Does betaine help with workouts?⌄

Several clinical trials suggest 2,500 mg per day for 1 to 2 weeks may modestly improve muscular power and endurance. Effects are subtle but reasonably consistent. Common in pre-workout formulas.

Should I take betaine with B vitamins?⌄

Betaine, folate, and vitamin B12 all work in the same homocysteine remethylation pathway. Combining them can be more effective for homocysteine reduction than betaine alone.

Can betaine raise cholesterol?⌄

Some studies suggest betaine may raise total or LDL cholesterol in some individuals at higher doses (3 g or more daily). Monitor lipids if using long-term at higher doses.

Is betaine safe long-term?⌄

Short to medium-term safety is well established. Long-term safety at high doses has less data; monitor lipids and overall health markers if using chronically.

References by claim

homocysteine reduction

Imani et al., 2019 — PubMed (2019) link

Lu et al., 2023 — PMC (2023) link

exercise performance (strength and power)

Zawieja et al., 2024 — PubMed (2024) link

Nobari et al., 2021 — PMC (2021) link

body composition

Cholewa et al., 2018 — PMC (2018) link

Nobari et al., 2021 — PMC (2021) link

liver health (NAFLD/NASH)

Trujillo-Gonzalez et al., 2026 — PMC (2026) link

Miglio et al., 2000 — PubMed (2000) link

Track Betaine with Pilora

Set up dose reminders, check interactions, and join the community in the Pilora iPhone app.

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Evidence-based·Last reviewed May 30, 2026·Evidence current as of May 30, 2026·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.