Three Supplements, One Question

Most supplement questions get asked in the wrong shape. "Does it work?" assumes there is a single thing to work at. But strength, endurance, and recovery are three different outcomes, and a compound that helps one may do little for another. The more useful question is narrower: work at what, for whom, measured how.

A systematic review and network meta-analysis published in Nutrients in March 2026 set out to do something the supplement conversation rarely does: compare dietary protein, creatine, and omega-3 fatty acids head to head, across three separate outcomes — muscle strength, endurance performance, and recovery [4]. Most trials test one supplement against a placebo. A network meta-analysis pools direct and indirect comparisons so you can rank interventions that were never tested against each other in the same study, using a frequentist random-effects model to combine the evidence [4].

The inclusion criteria matter more than they might seem. The authors restricted the analysis to randomized controlled trials in people engaged in structured training for at least six months [4]. That is a deliberate filter. Results in trained bodies do not transfer cleanly to untrained ones, and vice versa — a novice often improves on almost any stimulus, which makes it hard to isolate what a supplement actually contributed. By requiring six months of structured training, the review is asking a specific question: among people already adapted to exercise, what do these three additions do?

The honest limit of what I can tell you from the available extract is that the review compared these three supplements across those three outcomes — not which came out ahead on each. That gap is worth sitting with rather than papering over. Because the more durable insight is structural: these are not interchangeable products competing for the same slot in your day. Protein supports tissue repair and the raw material for muscle. Creatine acts on short, high-intensity energy availability. Omega-3s sit closer to the inflammation and recovery side. Ranking them on a single axis of "best" misunderstands what each is for.

That framing connects to a broader point running through the recent literature. A 2026 review in Nutrients on nutrition in exercise makes the unglamorous case that nutrition affects all bodily processes by supporting energy production and tissue maintenance [2]. Supplements, in that light, are a thin layer on top of energy adequacy — useful only once the larger inputs are handled. And a December 2025 narrative review in the Strength and Conditioning Journal adds a caution that applies to every table in every supplement paper: many dietary and nutrient recommendations rest on research conducted only in men, even though physiological, neurological, and hormonal changes across a woman's life cycle meaningfully shift nutritional needs [1]. When you read a supplement ranking, it is worth asking who was in the trials.

There is also a safety dimension that the everyday framing of supplements tends to skip. A July 2026 episode of Sigma Nutrition Radio with pharmacist Giulia Guerrini made the point that supplement risk is not general but individual — the same product can be reasonable for one person and inappropriate for another depending on their medications, health conditions, dose, and formulation [3]. Some interactions change how a drug is absorbed, metabolised, or cleared; others amplify or oppose its clinical effect [3]. Creatine and omega-3s are among the most studied and generally well-tolerated compounds, but "well-tolerated" is a population statement, not a personal guarantee.

Put it together and the supplement question resolves into something calmer than the marketing suggests. Three of the best-evidenced compounds were serious enough to warrant a formal comparison across trained athletes [4]. That is a small, well-defined domain — not a mandate that everyone needs all three. The interesting work is matching the tool to the outcome you actually care about, on top of a diet that already covers energy and protein, and checking that nothing you take collides with anything you are prescribed.

RESEARCH RADAR

• A network meta-analysis in Nutrients compared protein, creatine, and omega-3 supplementation across strength, endurance, and recovery, drawing only on RCTs in people with at least six months of structured training [4]. The design lets researchers rank interventions that were never directly tested against one another.
• A narrative review in the Strength and Conditioning Journal highlights the absence of sex-specific guidelines for calories, carbohydrates, fats, proteins, and select supplements [1]. Much of the underlying research was conducted in men, despite hormonal shifts across a woman's life cycle altering needs.
• On Sigma Nutrition Radio, pharmacist Giulia Guerrini argued that supplement safety depends on the individual — medications, conditions, dose, and formulation can all change whether a product is appropriate [3].

ONE THING TO TRY

Pick one supplement you currently take, or are considering, and write down the single outcome you want it to affect — strength, endurance, recovery, or general health. If you cannot name a specific outcome, that is useful information about whether it earns its place.

WORTH YOUR ATTENTION

• **Comparative Effects of Protein, Creatine, and Omega-3 (Network Meta-Analysis, Nutrients)** — A rare head-to-head of three staple supplements across three distinct outcomes in trained athletes [4].
• **The Role of Nutrition in Exercise and Sports (Nutrients)** — A grounding reminder that supplements sit on top of energy and tissue maintenance, not in place of them [2].
• **Supplement Safety & Medication Interactions (Sigma Nutrition Radio, ep. 613)** — Why "generally safe" is a population claim, and how to think about your own case [3].
• **Nutrition Considerations for Female Athletes (Strength and Conditioning Journal)** — Read before trusting any generic supplement recommendation [1].

The wrong shape of question invites the wrong kind of answer — usually "more." The better question, work at what, for whom, quietly narrows the field until most of the noise falls away and only the few things that match your goal remain.