Soy Protein

What does the research say about Soy Protein?

4 health outcomes synthesised

Soy protein has been studied across 4 health outcomes, with the strongest evidence supporting its role in reducing blood cholesterol. In 9 studies, 6 reported beneficial effects, typically at doses of 10–40 g/day over 8–12 weeks in clinical populations such as postmenopausal women and individuals with chronic kidney disease. Moderate evidence also suggests benefits for walking speed in frail elderly adults, based on 3 studies.

Strongest evidence

The highest-quality evidence is for reduced blood cholesterol, classified as high evidence strength. Across 9 studies, 6 reported beneficial effects with small-to-moderate effect sizes (e.g., total cholesterol reductions of 10.4% in one RCT or -20.55 mg/dL in a meta-analysis). Effective doses ranged from 10–40 g/day, typically over 8–12 weeks. For improved walking speed, moderate evidence from 3 studies all showed beneficial moderate-sized effects in pre-frail and frail elderly adults at a dose of 14.5 g/day over 8–12 weeks.

Mixed or weaker evidence

Evidence for reduced LDL cholesterol is low in strength and mixed: 2 of 3 studies reported benefit (one moderate, one small effect), while 1 found no effect at 40 g/day over 90 days. For reduced C-reactive protein levels, evidence is also low: 1 of 3 studies (a meta-analysis in adults with chronic inflammatory diseases) showed a moderate benefit, while 2 other studies found no significant effect.

Effective dose patterns

Across outcomes, the most consistent effective dose range is 10–40 g/day, particularly for cholesterol reduction. For walking speed, 14.5 g/day was the specific dose reported. Doses of 40 g/day were common across multiple studies but showed mixed results for LDL and CRP outcomes.

Population insights

Beneficial effects on cholesterol were most often seen in clinical populations—adolescents with overweight/obesity, chronic kidney disease patients, type 2 diabetic nephropathy patients, and postmenopausal women. For walking speed, benefits were specific to pre-frail and frail elderly. The cholesterol benefit may depend on baseline cholesterol levels or health status, as neutral studies in older men after prostatectomy found no effect.

Notable caveats

Publication bias is a concern across the literature, as null-result studies are less likely to be published. Most evidence bases are small (3–9 studies per outcome), and conclusions for moderate and low-strength outcomes should be considered preliminary. For two of three walking speed studies, the form of soy protein was not reported, and benefits may depend on concurrent exercise training.

Frequently asked

What is Soy Protein good for according to research?
The strongest research support is for reducing blood cholesterol, with 6 of 9 studies showing benefit, typically at doses of 10–40 g/day. Moderate evidence from 3 studies also supports improved walking speed in frail elderly adults.
What dose of Soy Protein is typically used in studies?
Doses of 10–40 g/day are most commonly studied, particularly for cholesterol reduction. For walking speed, a specific dose of 14.5 g/day was reported in one study. Higher doses around 40 g/day have also been used in research on LDL cholesterol and C-reactive protein, though results are mixed.
Who benefits most from Soy Protein?
Beneficial effects on blood cholesterol are most evident in clinical populations such as adolescents with overweight/obesity, chronic kidney disease patients, and postmenopausal women. For walking speed, benefits are specific to pre-frail and frail elderly adults. Soy protein may not be effective for cholesterol reduction in older men after prostatectomy.
Are there caveats or limitations in the research on Soy Protein?
Yes. Publication bias is a concern—null-result studies are less likely to be published. Most evidence bases are small (3–9 studies per outcome), and conclusions for moderate and low-strength evidence should be considered preliminary. For walking speed, benefits may depend on concurrent exercise training, and the form of soy protein was not always reported.
Does Soy Protein help with reduced LDL cholesterol?
Evidence is mixed and low in strength. Of 3 studies, 2 reported small-to-moderate reductions in LDL cholesterol, while 1 found no effect at 40 g/day over 90 days. The benefit was observed mainly in patients with type 2 diabetic nephropathy, and results may not generalize to other populations.
Does Soy Protein help with inflammation?
Research is limited and inconsistent. Of 3 studies, one meta-analysis found a moderate reduction in C-reactive protein in adults with chronic inflammatory diseases, but two other studies (including an RCT) found no significant effect. The overall evidence strength is low.

High evidenceReduced Blood Cholesterol
Moderate evidenceImproved Walking Speed
Low evidenceReduced LDL Cholesterol
Low evidenceReduced C-Reactive Protein Levels
Increased Lean Mass
Reduced Proteinuria
Reduced Uric Acid Levels
Reduced Triglyceride Levels
Reduced Total Cholesterol Levels
Improved Leg Strength

Most-studied combinations with Soy Protein

most supplement research is combination research

Also studied with:Casein Protein (4), Whey Protein (4), Milk Protein (4), Soy (3)

Phytoestrogen with Wild Yam

By Solaray

5 (26 reviews)

In Stock

Pricing Information
Ingredient	Soy Protein
Amount per Pill	150 mg
Total Amount	4.5 g
Price per mg	USD 0.005

Supplement Ingredients
Ingredients	Amount Per Serving
wild yam (Dioscorea villosa) (root) Wild Yam	200 mg
guaranteed to contain 2.5% diosgenin	5 mg
soy (Glycine max) (bean concentrate) SoySoy Protein	150 mg
total isoflavones	60 mg
genistin	33 mg
daidzin	25.5 mg
black cohosh (Cimicifuga racemosa) extract Black Cohosh	40 mg
root	-
guaranteed to contain 27-deoxyactein	-
Dong Quai (Angelica sinensis) Dong Quai	40 mg
root	-

Product Description

Promotes hormonal balance with natural phytoestrogens.
Contains 2.5% diosgenin from wild yam, known for its endocrine-supporting properties.
Provides total isoflavones 60 mg, derived from soybeans, supporting menopausal comfort.
Enriched with Black Cohosh extract, traditionally used for easing menopausal symptoms.
Includes Dong Quai, revered in herbal medicine for its potential to support female health.
Features genistin and daidzin, components of soy that may support bone health.
Formulated using vegetarian capsules, making it suitable for plant-based diets.
Encapsulates centuries of herbal wisdom with a blend that supports overall well-being during hormonal transitions.

Other ingredients

grapefruit juice concentrate
vegetable cellulose capsule
maltodextrin
cellulose
pygeum (bark extract)
silica
magnesium stearate
african cherry (berry)
saw palmetto (berry)
ginger (root)
licorice (root)
alpha galactosidase

Free of

Serving Size: 1

Servings per Container: 30

Pill Type: Vegetable Capsule

Flavor: -

UPC: 076280375862

Testralin

By Metagenics

5 (2 reviews)

In Stock

Pricing Information
Ingredient	Soy Protein
Amount per Pill	62.5 mg
Total Amount	3.75 g
Price per mg	USD 0.02

Supplement Ingredients
Ingredients	Amount Per Serving
Vitamin D	9.4 mcg
Vitamin B6 Vitamin B6	25 mg
Folate	330 mcg DFE
Vitamin B12 Vitamin B12	15 mcg
Zinc Zinc	2.5 mg
Selenium Selenium	100 mcg
Decaffeinated Green Tea (Camellia sinensis) Leaf Extract Green Tea	167 mg
catechins	100 mg
epigallocatechin gallate (EGCG)	67 mg
Tumeric (Curcuma longa) Rhizome Extract Turmeric	79 mg
curcuminoids	75 mg
Soybean Concentrate Soy Protein	62.5 mg
Total Isoflavones	25 mg
Phytosterols	50 mg
beta-sitosterol Beta-sitosterol	-
stigmasterol Stigmasterol	-
campesterol Campesterol	-
Betaine	37.5 mg
Lingnans	25 mg
Oleanolic Acid	5 mg
Lycopene	5 mg

Gluten Free