One Size Fits Nobody: The Science of Personalised Supplementation

Walk down the supplement aisle of any pharmacy and you will see hundreds of products, all making the same implicit promise: take this, feel better. Yet the people taking them are wildly different — different ages, diets, activity levels, and genetic backgrounds. The uncomfortable truth emerging from nutrition science is that a supplement that helps one person may do nothing for another, and the difference is rarely luck. It is biology.

This is the core idea behind personalised supplementation: your nutritional needs are not the population average, and your supplement strategy should not be either.

Why the Recommended Daily Allowance Is Not About You

Recommended Daily Allowances (RDAs) were designed to prevent deficiency diseases in healthy populations — a blunt, population-wide tool. They are deliberately conservative estimates that cover about 97% of people's estimated needs. But covering a population is not the same as optimising an individual. A 22-year-old vegan endurance runner and a 65-year-old who eats fish twice a week have almost nothing in common nutritionally, yet both are handed the same numbers on the same labels.

Research into nutrigenomics — the study of how genes influence nutrient metabolism — has identified hundreds of common genetic variants that change how we absorb, transport, and use nutrients. Variants in genes like MTHFR can reduce folate conversion efficiency. Differences in FADS1 and FADS2 affect how well someone converts plant-based short-chain omega-3s (ALA) into the long-chain forms (EPA and DHA) the brain actually uses. For some people, that conversion runs at less than 5% efficiency — which is precisely why blanket advice falls short.

The Biomarker Gap

If genetics explains why two people respond differently to the same food, biomarkers are how we measure it. Vitamin B12, ferritin, vitamin D, omega-3 index, homocysteine — these measurable values tell you what is actually happening inside your body right now, not what is statistically likely for someone like you.

Studies of supposedly 'healthy' adults routinely find large percentages with suboptimal status in one or more of these markers — even in populations eating varied diets. Among people following plant-based diets, the pattern is even more predictable: B12, iron, zinc, iodine, and long-chain omega-3s are the well-documented gaps. The irony is that plant-based eaters tend to be more health-conscious, yet they are also the group for whom personalised supplementation matters most, because the gaps are systematic rather than random.

What Personalised Actually Looks Like in Practice

A science-based personalised supplement strategy follows a simple sequence. First, establish your baseline: what do your blood values, diet history, and health goals say about your current status? Second, target only the gaps that matter for you — supplementing nutrients you already have plenty of offers little benefit and can occasionally cause harm. Third, choose nutrient-dense whole-food sources wherever possible, because food matrices deliver nutrients alongside fibre, cofactors, and bioactive compounds that isolated powders do not. Fourth, retest after a few months and adjust.

This closed loop — assess, target, nourish, retest — is what separates genuine personalisation from the 'custom vitamin' marketing that simply asks you to fill in a quiz. The quiz guesses. A loop measures.

Where Lemna Fits In

This is also where lemna duckweed earns its place in modern nutrition. Lemna is one of the few plants that delivers a meaningful portion of several of the nutrients plant-based diets most often miss — high-quality complete protein, iron, zinc, and a natural spectrum of carotenoids and polyphenols — in a whole-food matrix rather than a synthetic isolate. When a personalised plan identifies a gap, the question becomes how to close it. Whole-plant sources like lemna offer density and breadth that isolated single-nutrient capsules cannot replicate.

Rather than taking a different pill for every gap, a single nutrient-dense plant base can cover several needs at once — which is why we built the LIV. system around lemna as a foundation and personalise on top of it, matching formulation and dosage to your individual biomarkers and goals.

The Takeaway

Personalised supplementation is not a luxury idea or a marketing gimmick. It is simply what the evidence supports: genetics and measured status determine need, food-first sources determine quality, and regular retesting keeps the strategy honest. The era of supplementing by trend, habit, or aisle-adjacent guesswork is ending. The future is the opposite: fewer, better, and precisely targeted nutrients — chosen because your own biology asked for them.