EVIDENCE-BASED SUPPLEMENT SCORING
8.1/10
SOLID OPTION

Confidence: 70%

HEART & SOIL 100% Grass Fed Protein Powder – Single Ingredient: Whey Protein Concentrate - UNFLAVORED – Cold-Processed to Preserve Nutrients – 24g of Pure Grass Fed Whey Per Serving – 2lbs

HEART & SOIL 100% Grass Fed Protein Powder – Single Ingredient: Whey Protein Concentrate - UNFLAVORED – Cold-Processed to Preserve Nutrients – 24g of Pure Grass Fed Whey Per Serving – 2lbs

B0FW28MR2F

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Decision summary

CONSIDERSOLID OPTION

A solid product, but not a clean win. The main trade-off is weaker formulation coherence.

Best for

People prioritizing high absorption and overall formula quality.

Consider another option if

You want fewer compromises on formulation quality.

Score breakdown

Tap a module to see what it measures. A 0 can reflect missing disclosure, not just a negative result.

Dosage quality

4.8/10

Dosing looks weaker than ideal

Checks whether labeled ingredient amounts fall within clinically studied ranges (not just regulatory minimums). Low/0 can reflect under-dosing or missing amounts (e.g., proprietary blends).

Multi-ingredient formulation analysis

Dose 4.8/10 · Bioavailability 2/10 · Coherence 0/10

Dose quality suggests a diluted formulation.

Ingredient form quality suggests suboptimal ingredient forms.

This is a multi-ingredient product. The score reflects formulation quality, not efficacy for a specific health goal.

Score summary

Vitamin-d: high-bioavailability form declared (Cholecalciferol (D3)). The main limitation is that formula coherence is weak: diluted, decorative or overly complex.

Strengths

Vitamin-d: high-bioavailability form declared (Cholecalciferol (D3))

Weaknesses

Formula coherence is weak: diluted, decorative or overly complex
Vitamin-d: below clinically studied range
Calcium: below clinically studied range

Final verdict

A solid product, but not a clean win. The main trade-off is weaker formulation coherence.

Ingredient Analysis & Evidence

A closer look at the main ingredients, how they influence the score, and the supporting evidence when available. Tap any ingredient to expand.

ℹ Evidence is strong, but dose is below the optimal range

Dose is well positioned: Dose is strong and within effective ranges.

Scientific evidence

Meta-analysis

Tang et al. meta-analysis protein supplementation and muscle mass gain

British Journal of Nutrition • 2009

PMID: 22150425.0

⚠ Strong evidence exists, but dose may be too low to be effective

A clear drag on the formula: Dose is likely below clinically useful levels. The declared form supports strong absorption.

Scientific evidence

Meta-analysis

Martineau et al. meta-analysis vitamin D supplementation and respiratory infections

BMJ • 2017

PMID: 26864360.0

Meta-analysis

Bischoff-Ferrari et al. meta-analysis vitamin D fracture prevention

BMJ • 2009

PMID: 20198382.0

⚠ Dose is below commonly used clinical ranges

A clear drag on the formula: Dose is likely below clinically useful levels. The declared form is acceptable, but not among the best-absorbed options.

Clinical dosing guidance

Based on established dosing ranges used in clinical practice.

Min effective: 1.1 mgOptimal: 10 mgUpper: 40 mgGrade: B

ℹ Dose is below the optimal range with moderate supporting evidence

One of the weaker points: Dose is likely below clinically useful levels. The declared form is acceptable, but not among the best-absorbed options.

Scientific evidence

Meta-analysis

Clarke et al. meta-analysis B vitamins and cognitive decline

American Journal of Clinical Nutrition • 2007

PMID: 22243457.0

RCT

Shipton & Thachil review of vitamin B12 deficiency and fatigue

Postgraduate Medical Journal • 2015

PMID: 20648714.0

⚠ Moderate evidence exists, but dose is below effective threshold

One of the weaker points: Dose is likely below clinically useful levels.

Scientific evidence

Systematic review

Patel et al. systematic review biotin and hair/nail health

Skin Appendage Disorders • 2017

PMID: 28786550.0

⚠ Strong evidence exists, but dose is below effective threshold

A clear drag on the formula: Dose is likely below clinically useful levels.

Scientific evidence

Systematic review

Zimmermann et al. review on iodine deficiency and thyroid function in human populations

Endocrine Reviews • 2009

PMID: 19357404.0

Cohort

Bath et al. maternal iodine status and offspring cognitive outcomes (ALSPAC cohort)

Lancet • 2013

PMID: 23683674.0

HEART & SOIL 100% Grass Fed Protein Powder – Single Ingredient: Whey Protein Concentrate - UNFLAVORED – Cold-Processed to Preserve Nutrients – 24g of Pure Grass Fed Whey Per Serving – 2lbs

HEART & SOIL 100% Grass Fed Protein Powder – Single Ingredient: Whey Protein Concentrate - UNFLAVORED – Cold-Processed to Preserve Nutrients – 24g of Pure Grass Fed Whey Per Serving – 2lbs

Warnings & notes

Important label or formulation details that may affect how this product should be interpreted.

Formula design looks less coherent than stronger alternatives

The formulation appears less focused than better-built options.

Note
!

Vitamin D dose looks below clinically effective levels

Declared amount falls below ranges used in human trials.

Warning
!

Calcium dose looks below clinically effective levels

Declared amount falls below ranges used in human trials.

Warning

Methodology

Read our methodology overview to understand how SuppScoreLab combines multiple scientific dimensions into one practical score.

View methodology →

This evaluation is based on the product label and declared Supplement Facts available at review time. It does not verify laboratory-tested composition, purity, or batch-level quality. This content is educational and not medical advice. Consult a qualified healthcare professional for personal health decisions. Affiliate disclosure: SuppScoreLab may earn a commission from qualifying Amazon links.

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