Our buying guides compare supplements sold in the UK using published product information: label doses, ingredients, any testing a brand publishes, and price. Each guide shows how it was put together and when it was last checked.
Ownership disclosure: The Longevity Shop and Charava are under common ownership. Charava products appear in these guides, and we may benefit when you buy from Charava. Each guide explains its method and repeats this disclosure at the top of the page.
Buying guides
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Best collagen supplements in the UK
Five collagen supplements compared on dose, source, ingredients and testing.
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Best creatine supplements in the UK
Six creatine supplements compared on sourcing, purity, testing, formula and value.
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Best magnesium glycinate supplements in the UK
Five magnesium glycinate supplements compared on elemental dose, ingredients and value.
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Best NMN supplements in the UK
Five NMN supplements compared on dose, purity, testing and formulation.
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Best urolithin A supplements in the UK
Urolithin A supplements compared on dose, ingredients and published product information.
Explainers
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What is longevity?
Lifespan, healthspan and the research behind the everyday habits studied in longevity science.
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Liposomal NMN vs regular NMN
What "liposomal" means on a label and what the evidence does and does not show.
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NMN vs NR: the differences
How nicotinamide mononucleotide and nicotinamide riboside differ.
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Bovine vs marine collagen
How the two most common collagen sources differ.