Soybean

Also known as: Glycine max, soy, soya, soybean isoflavones, soy protein

Evidence under review. — Not yet rated

Whole food legume. Limited human trial data; some evidence for hot flash reduction in postmenopausal women.

What it does

Soybean is a legume widely consumed as a whole food and used as an ingredient in oils, protein meals, and supplements. In one 12-week randomized trial, a low-fat vegan diet supplemented with...
Evidence quality

Evidence base hasn't been formally rated yet. See research below.
Clinical dose

No established dose from provided studies
Found in

Nature Made Vitamin D3 1000 IU Liquid Softgel, Balance of Nature Fruits & Veggies, Dymatize ISO100 Gourmet Chocolate and 7 more

What the Science Says

Soybean is a legume widely consumed as a whole food and used as an ingredient in oils, protein meals, and supplements. In one 12-week randomized trial, a low-fat vegan diet supplemented with soybeans was associated with weight loss and a reduction in severe hot flashes in postmenopausal women, largely linked to replacing animal foods with plant foods. Soybean-derived nanovesicles have also been explored in early-stage research as a potential platform for delivering phytoestrogens relevant to bone health in osteoporosis.

What It Doesn't Do

Not proven to directly reduce hot flashes on its own — the benefit seen was tied to an entire dietary pattern change, not soy alone. No human evidence from these studies that it builds muscle, boosts testosterone, or detoxifies the body. Soybean oil in IV nutrition for premature infants did not reduce bilirubin-related brain injury at lower doses. Don't assume 'plant-based' automatically means safe or effective for any specific condition.

Evidence-Based Benefits

A soybean-supplemented vegan diet reduced severe hot flashes in postmenopausal women over 12 weeks.

Weak Evidence

Effective at: Whole soybeans as part of a low-fat vegan diet (exact dose not specified)

Supporting studies (click to view on PubMed):

PMID 42345553

Replacing animal foods with plant foods including soybeans was linked to meaningful weight loss in postmenopausal women.

Weak Evidence

Effective at: Whole soybeans as part of a low-fat vegan diet over 12 weeks

Supporting studies (click to view on PubMed):

PMID 42345553

Absorption & Bioavailability

Unknown from provided studies for human supplemental use; soybean oil as parenteral emulsion is directly infused intravenously in clinical settings, bypassing digestion entirely

Red Flags to Watch For

Most provided research involves animal models (pigs, broilers, cattle) — not directly applicable to human supplementation
Soybean oil used in IV nutrition for preterm infants showed higher unbound bilirubin at higher doses, raising safety concerns in vulnerable populations
Trypsin inhibitor proteins naturally present in soy can impair amino acid absorption and may worsen gut infections — processing quality matters
Heavy metals (notably iron) have been detected at elevated levels in soybean oil in some regional analyses — sourcing and quality control are important
Hot flash reduction seen in one trial was confounded by an entire dietary overhaul, not soy supplementation alone

Supplement

Legitimate

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Frequently Asked Questions

What does Soybean do?

Whole food legume. Limited human trial data; some evidence for hot flash reduction in postmenopausal women.

What is the effective dose of Soybean?

No established dose from provided studies

Is Soybean safe?

Most provided research involves animal models (pigs, broilers, cattle) — not directly applicable to human supplementation

What doesn't Soybean do?

Not proven to directly reduce hot flashes on its own — the benefit seen was tied to an entire dietary pattern change, not soy alone.

Research Sources

PubMed
NIH DSLD

This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-07-06