Research Articles
In-depth, evidence-based guides to help you make informed supplement decisions. Every claim is backed by published clinical research.
Vitamin B12 Deficiency: What the Diagnostic Research Covers
Vitamin B12 deficiency affects an estimated 6% of UK adults under 60 and up to 20% over 60 — yet standard serum B12 testing misses a substantial proportion o...
Iron Supplementation Forms: What the Absorption Research Reports (Ferrous Sulfate, Fumarate, Bisglycinate)
Iron deficiency is the most common nutrient deficiency globally and disproportionately affects UK pre-menopausal women, vegetarians, and endurance athletes. ...
Zinc and Immune Outcomes: What the Trial Evidence Reports
Zinc is involved in the development and function of virtually every branch of the immune system. This article summarises what trial evidence — including the ...
Caffeine in Ergogenic Trials: What the Evidence Shows
Caffeine is among the most extensively studied ergogenic compounds in sports science. This article summarises what the trial evidence — including Grgic's umb...
Collagen Peptides Research: What Measured Endpoints Exist
Hydrolysed collagen peptides are among the most commercially visible supplement ingredients in the UK. This article summarises the measured endpoints found i...
Beta-Alanine in Sports Performance Trials: What the Evidence Shows
Beta-alanine is one of the most evidence-dense sports nutrition ingredients in the published literature. Two major meta-analyses — Hobson et al. (2012) and S...
Ashwagandha: Stress, Sleep & Strength — What the Research Shows
Ashwagandha is one of the most-researched adaptogens in supplement form. Multiple meta-analyses confirm meaningful reductions in cortisol and perceived stres...
Vitamin D3: The Complete UK Guide — Who Needs It, How Much, and Which to Buy
One in five UK adults is deficient in vitamin D — rising to one in three in winter. This guide covers what the evidence actually shows, how much you need, wh...
Omega-3 Fish Oil: What the Evidence Actually Says — A UK Buyer's Guide
Omega-3 fish oil is one of the most widely purchased supplements in the UK, yet the clinical picture is more nuanced than the marketing suggests. This guide ...
Magnesium Supplements: Glycinate vs Citrate vs Oxide — A UK Evidence Guide
Magnesium is a cofactor in over 300 enzyme systems, yet surveys suggest a significant proportion of UK adults consume less than the recommended intake. This ...
Probiotics: Do They Work? What the Evidence Says for IBS, Antibiotics & More
Probiotics are among the most purchased supplements in the UK, yet most products on shelves have no clinical evidence for their specific strains. Here is wha...
Best Creatine Monohydrate UK (2026)
We evaluated UK creatine supplements on third-party testing, ingredient purity, certifications, and cost per serving. Here are the top picks for 2026.