The supplement industry is enormous, largely unregulated, and filled with products that do very little at meaningful doses. This post focuses on the small number of supplements with consistent clinical evidence behind them — the ones that are actually worth adding to your routine.
4 items across all categories
Magnesium Glycinate 400mg
MineralsMagnesium deficiency is common in people eating modern diets, and glycinate is the form best absorbed without the digestive side effects that oxide or citrate forms often cause. It's involved in over 300 enzymatic processes. The glycinate chelation means a higher proportion actually reaches the bloodstream — which matters when most supplements are poorly absorbed to begin with.
Worth it because
- Glycinate form has superior absorption vs oxide
- No laxative effect at standard doses
- Wide evidence base across multiple functions
The catch
- Takes several weeks of consistent use to notice effects
- Pricier than magnesium oxide alternatives
Vitamin D3 2000IU + K2 100mcg
VitaminsThe NHS recommends vitamin D supplementation for everyone in the UK from October to March due to insufficient sunlight. D3 is the more bioavailable form versus D2. K2 as MK-7 is paired because it directs calcium to bones rather than arteries — the combination is better supported than D3 alone. One of the few supplements with a genuine public health recommendation behind it in the UK context.
Worth it because
- NHS-recommended for UK winters
- D3 + K2 combination is better than D3 alone
- Widely deficient in UK population
The catch
- Fat-soluble — must be taken with food containing fat
- Blood test needed to confirm deficiency and optimal dose
High-Strength Omega-3 Fish Oil (1000mg EPA/DHA)
Fatty AcidsThe key with omega-3 is the actual EPA and DHA content — not the total fish oil capsule weight. Many cheap products contain 1000mg of fish oil but only 300mg of active EPA/DHA. You need triglyceride form over ethyl ester for meaningful absorption. High-strength formulas mean fewer capsules to hit an effective daily dose. One of the most extensively studied supplements available.
Worth it because
- High EPA/DHA per capsule — fewer needed daily
- Triglyceride form absorbs significantly better
- Among the most evidence-backed supplements available
The catch
- Quality varies enormously — brand matters
- Fish burps if not taken with food or refrigerated
Creatine Monohydrate (5g daily)
PerformanceCreatine monohydrate has more peer-reviewed research behind it than almost any other supplement. It replenishes phosphocreatine stores, which directly supports short-burst, high-intensity output. More recent research also explores cognitive benefits. Monohydrate is the original and best-studied form — there is no meaningful evidence that more expensive forms (ethyl ester, HCl) outperform it. The cheapest version works as well as the premium one.
Worth it because
- One of the most researched supplements in existence
- Monohydrate works as well as expensive alternatives
- Very inexpensive per serving
The catch
- Initial water retention of 1–2kg is normal
- Takes 3–4 weeks of daily use to saturate muscle stores