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Sarah Mitchell, MS, RDN

Registered Dietitian Nutritionist & Lead Reviewer at VitalGuide

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Sarah Mitchell

MS, RDN — Registered Dietitian Nutritionist

Sarah Mitchell is a Registered Dietitian Nutritionist (RDN) with a Master's degree in Nutritional Sciences and over a decade of experience evaluating clinical nutrition research. She leads VitalGuide's editorial review process, ensuring every product recommendation and supplement review reflects current scientific evidence and best practices in nutrition. Sarah specialises in translating complex research on micronutrients, adaptogens, and ergogenic aids into clear, actionable guidance for health-conscious consumers. Her work is grounded in peer-reviewed literature, and she applies a rigorous, evidence-first standard to every category she covers.

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Areas of Expertise

Dietary Supplements

Evaluating efficacy, safety profiles, and dosing for vitamins, minerals, adaptogens, nootropics, and ergogenic aids.

Clinical Nutrition

Interpreting clinical trials, meta-analyses, and systematic reviews to assess nutrient interventions for health outcomes.

Sports & Performance Nutrition

Evidence-based guidance on pre-workout compounds, protein intake, recovery nutrition, and hydration strategies.

Longevity & Healthspan

Research-backed assessment of longevity compounds including NMN, urolithin A, spermidine, and cellular health markers.

Gut Health & Microbiome

Reviewing the clinical evidence for probiotics, prebiotics, and dietary strategies for gastrointestinal health.

Sleep & Recovery

Evaluating supplements and lifestyle interventions for improving sleep quality, circadian rhythm, and overnight recovery.

Education & Credentials

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Master of Science (MS) — Nutritional Sciences Advanced graduate training in human metabolism, micronutrient biochemistry, and clinical nutrition research methodology
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Registered Dietitian Nutritionist (RDN) Commission on Dietetic Registration — nationally recognised credential for evidence-based dietary and nutrition practice
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10+ Years Clinical Research Experience Extensive background reviewing peer-reviewed literature across nutrition, supplementation, and preventive medicine

Editorial Standards

Sarah applies a rigorous evidence-first review process to all content at VitalGuide. Every supplement recommendation is grounded in peer-reviewed clinical trials, with clear disclosure of the strength of available evidence. She prioritises human clinical data over animal studies or in vitro research, and is transparent about gaps in the research.

VitalGuide earns revenue through Amazon affiliate commissions. This commercial relationship never influences Sarah's ratings or recommendations — products are evaluated on scientific merit, quality, and value. See our How We Review and Affiliate Disclosure pages for full details.

Recent Articles by Sarah Mitchell

The Complete Guide to Magnesium Types: Glycinate vs Threonate vs Malate

A comprehensive comparison of every magnesium form with top product recommendations for each health goal.

Omega-3 Fish Oil: Benefits, Dosing & Best Supplements

EPA, DHA, and evidence-based benefits for cardiovascular health, brain function, and inflammation.

Ashwagandha for Stress & Cortisol — Does It Work?

Clinical evidence, optimal dosing, and the best KSM-66 and Sensoril ashwagandha supplements.

Longevity Supplements: What the Science Actually Says

Evidence review of NMN, urolithin A, spermidine, and other longevity compounds.

Vitamin D3 + K2: Why They Work Better Together

The synergistic evidence for bone and cardiovascular health, optimal dosing, and the best supplements.

Berberine & GLP-1: Blood Sugar, Weight & Metabolic Health

Clinical evidence for berberine as a natural metabolic supplement, compared to GLP-1 medications.

View all articles by Sarah Mitchell →