The short answer
A complete plant protein that supports muscle and can modestly lower LDL when replacing higher-saturated-fat foods.
- Evidence and scope
- Supported for specific outcomes
This status does not grade the ingredient for every goal, outcome, or person.
- Important limitation
- Evidence supports a specific outcome, not a general wellness or longevity effect.
- Before deciding
- Key concern: Soy allergy; separate from levothyroxine and maintain consistent intake.
01 / PRACTICAL GUIDE
Dose, absorption, and combinations
These are indication-specific reference or studied ranges—not a personalized prescription. Start with the objective, then check the form, label, medicines, and health conditions.
Reference or studied range—not a personalized prescription. The product label or a clinician may specify a different dose.
Dose source ↗More is not automatically better. A clinician or product label may specify a different amount.
Fat/water solubility is not the useful decision point; preparation, fluid, timing, or strain identity matters more.
Use as part of meals or after training.
Soy allergy; separate from levothyroxine and maintain consistent intake.
Dose and use links lead to primary or official source material. Search links are discovery tools, not proof that every returned paper applies.
02 / EVIDENCE
What the research says
We keep supportive, mixed, negative, safety, and contextual findings together. The headline never replaces the underlying papers.
These are audited counts for this JIVANA collection, not search-result totals. Participants are counted once when multiple papers use the same cohort; review papers are not added again to participant totals.
Open the research timelineResearch timeline+
Entries are ordered by publication year. A study period appears only when the source reports it.
No Significant Differences in Muscle Growth and Strength with Leucine-Matched Soy and Whey Protein
Lean mass and strength increased in both groups with no between-source difference; muscle-thickness increase did not reach significance. Matching leucine removed the whey advantage seen in some earlier trials, but there was no no-supplement control.
Study design and methods
- Design
- Randomized, double-blind, active-comparator trial
- Population
- 61 untrained adults aged 18–35; 48 completed
- Intervention
- Soy isolate 26 g or whey isolate 19 g, each providing 2 g leucine, during supervised resistance training
- Outcome
- Lean mass, muscle thickness, and leg-extensor and flexor strength
Funding or conflict note: The authors declared no conflicts and reported that funders had no role in the study or publication decisions.
A Meta-Analysis of 46 Studies Identified by the FDA Demonstrates that Soy Protein Decreases LDL and Total Cholesterol
Soy protein lowered LDL by 4.76 mg/dL and total cholesterol by 6.41 mg/dL, about a 3–4% LDL effect. Most individual trials favored soy but only a minority were individually significant; clinical cardiovascular events were not tested.
Study design and methods
- Design
- Meta-analysis of 43 controlled trials from 46 studies identified by the FDA
- Population
- Adults with baseline LDL cholesterol of 110–201 mg/dL
- Intervention
- Soy protein, median 25 g/day, versus non-soy protein
- Outcome
- LDL and total cholesterol
Funding or conflict note: One author was affiliated with the Soy Nutrition Institute. The abstract did not report an aggregate participant count, so none is inferred.
Whey protein supplementation during resistance training augments lean body mass
Lean-mass gain was smaller with soy (1.8 kg) than whey (3.3 kg) and similar to carbohydrate (2.3 kg); fat-mass change did not differ. The result conflicts with later leucine-matched evidence and cannot separate source from leucine or dose differences.
Study design and methods
- Design
- Randomized, isocaloric three-arm resistance-training trial
- Population
- 63 previously untrained adults
- Intervention
- Daily soy protein, whey protein, or carbohydrate supplement during supervised training
- Outcome
- Lean body mass, fat mass, and plasma amino-acid response
Unscreened discovery appendix—not evidence2 candidate publicationsSearch run: Aug 21, 2026
Complete for the displayed PubMed query at the search timestamp—not for all databases or every possible synonym. Candidates can be irrelevant, duplicate the same study, or report negative findings. They are never summed as evidence or participants until screened.
03 / SOURCES
Start with the source material
The live search is for discovery only. Search-result counts change and are not included in the audited totals above.
Recent PubMed discovery recordsDirect links to the first 12 records returned by the reproducible search. These are discovery candidates—not reviewed summaries or a count of supportive findings.
- Effects of soy protein and resistance exercise on body composition and blood lipids in postmenopausal women.Maesta N, Nahas EA, Nahas-Neto J et al. · 2007 · Maturitas · PMID 17084566Open on PubMed ↗
- Effects of soy protein on endothelium-dependent vasodilatation and lipid profile in postmenopausal women with mild hypercholesterolemia.Blum A, Lang N, Vigder F et al. · 2003 · Clinical and investigative medicine. Medecine clinique et experimentale · PMID 12659466Open on PubMed ↗
04 / EXPERT CONTEXT
Expert context—not evidence
Expert positions are dated context—not scientific evidence. They never raise the evidence status or become consensus by repetition.
No direct, source-verified endorsement is currently recorded. Research authorship or discussion alone is not treated as endorsement.