Alpha-Methylselenobutanoic Acid

MineralSeleniumBest with a meal

What is it

Alpha-methylselenobutanoic acid is an organoselenium compound related to methylselenocysteine and methylselenic acid, found in selenium-enriched yeast and certain selenium-accumulating plants such as garlic and onions.

Evidence for 1 use

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

General selenium status

Mixed Evidence

There is no published human clinical evidence specifically for alpha-methylselenobutanoic acid.

How it works

Like other methylated selenium compounds, alpha-methylselenobutanoic acid is thought to enter selenium pools that produce methylselenol, a redox-active species investigated for chemopreventive activity in preclinical models. It is not a direct substrate for the major selenoproteins in the same way selenomethionine is. Human supplementation evidence for this specific compound is essentially nonexistent.

Dosage

There is no established dose. Selenium intake overall is set by the RDA (55 mcg/day for adults) and the upper limit (400 mcg/day). DSLD does not report a standardized supplement dose for this specific compound.

When and how to take it

Selenium supplements are usually taken with food.

1 commercial form

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

Component of selenium-enriched yeast or garlic

Usually present alongside selenomethionine and methylselenocysteine.

Part of a mix of organoselenium species

Safety

Selenium toxicity (selenosis) can occur above 400 mcg/day from any combination of forms, with symptoms including hair loss, brittle nails, GI upset, and neurological effects. Specific data on alpha-methylselenobutanoic acid in humans are lacking.

Who should be cautious

Stay within total selenium upper limits. Pregnant and breastfeeding people should use general selenium supplements rather than experimental organoselenium compounds. People with thyroid disease, autoimmune disease, or on chemotherapy should consult a clinician.

Interactions

Selenium can interact with anticoagulants, chemotherapy drugs, and other antioxidants. Specific interactions for this compound are not characterized.

Food sources

Selenium-enriched garlic

Amount
Small amount
%DV
—

Selenium yeast

Amount
Trace
%DV
—

Frequently asked questions

Is it the same as selenomethionine?⌄

No. It is a different organoselenium compound and has different metabolism.

Should I take it?⌄

For general selenium needs, well-studied forms such as selenium-enriched yeast or selenomethionine are more appropriate.

References

Alpha-Methylselenobutanoic Acid on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on Alpha-Methylselenobutanoic Acid (PubMed search) — PubMed link

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Evidence-based·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.