THE SPARTAN KIT: WHY THE STACK STOPS AT FOUR

A Spartan hoplite carried a shield, a spear, a sword, and a cloak. Chapter 5 of The Spartan Protocol argues the supplement shelf should be built the same way — and it stops at four items on purpose.

The kit a Spartan actually carried

The nutritional toolkit of a Spartan citizen was small enough to list in one breath: olive oil, wine cut with water, honey, salt, and whatever the syssitia's fixed rations provided. That was it for a man whose physical output rivaled anyone in the ancient world. No exotic compounds, no proprietary blends — a handful of things, used consistently, each doing a specific and well-understood job. Oil for calories and joint health. Wine for hydration, cut safely. Honey for fast fuel before exertion. Salt for the electrolyte losses a man sweating under bronze in a Mediterranean summer could not avoid.

Every item on that list earned its place through function. Nothing was there because someone was selling it. That is the standard Chapter 5 holds itself to, because the supplement industry has built a multi-billion-dollar business on the idea that discipline can be purchased in capsule form — and every chapter before it argues the opposite.

Four items, not forty

The chapter makes a case for minimalism that is separate from the specific items on the list. Protocol adherence — whether someone actually keeps doing the thing — declines as complexity increases. A four-item routine, taken at consistent times, survives contact with a real week. A fourteen-item stack requiring different timing, different food pairings, and a spreadsheet to track it gets followed for six weeks and then quietly abandoned.

The incentives run in opposite directions. More products sold means more revenue, regardless of whether the fifteenth item is doing anything measurable. Your incentive is the fewest interventions that produce the most sustained benefit.

If your supplement shelf has more entries than your actual training program has movements, something has gone sideways.

What earns a place

Creatine monohydrate. The chapter calls it the least controversial performance supplement in existence, and the one most men over fifty skip because it sounds like something a twenty-year-old bodybuilder takes. The mechanism is straightforward — creatine increases the muscle's phosphocreatine stores, which extends capacity for short, high-intensity effort, exactly what the loaded carries and grappling work in Chapter 3 demand. Three to five grams daily. No loading phase, no cycling, timing does not meaningfully move the outcome. There is a secondary line of research on creatine and cognitive function under sleep deprivation or mental fatigue — we went through that literature separately here, and the honest summary is that the brain evidence is far more mixed than the muscle evidence.

Vitamin D. Its place in the kit rests on an unglamorous argument: deficiency is common, testing is cheap, and correcting it is cheap. The chapter runs the mechanism through bone density, immune function, and testosterone regulation — noting directly that studies have found correlations between low vitamin D status and lower testosterone in men, and that the causal direction is not settled. The instruction in the book is bloodwork first, not a number off the internet.

Worth flagging a difference between the book and our own later reading of the trial data. Chapter 5 puts correction at 2,000 to 4,000 IU daily with a retest at three months. When we went through the large randomized trials — VITAL and STURDY in particular — the picture that came back was more conservative: STURDY's higher-dose arms recorded more falls than its 1,000 IU arm, not fewer. Both sources agree on the part that matters most, which is test rather than guess.

Magnesium, in glycinate or citrate form rather than the cheaper oxide that mostly passes through without absorbing well. The chapter's mechanism runs through magnesium's role in the GABA system and the parasympathetic shift the body needs to actually enter deep sleep. Three hundred to four hundred milligrams in the evening, roughly an hour before the wind-down sequence Chapter 7 builds. The trial evidence on magnesium and sleep is thinner than the marketing suggests — small samples, short durations — which is a reason to keep expectations proportionate, not a reason to drop it from a four-item kit.

Omega-3, specifically EPA and DHA from fish or algae oil rather than plant-based ALA, which converts to the active forms poorly. One to two grams combined EPA/DHA, taken with a meal containing fat, since these absorb poorly on an empty stomach.

How the book says to evaluate one before buying it

Third-party testing over brand reputation. NSF Certified for Sport or Informed Sport on the label means an independent lab has verified the product contains what it claims and is free of banned substances and contaminants — heavy metals being a documented issue at the low-cost end of the fish oil market specifically, given that the oil comes from fish that concentrate whatever was in their water.

Then check the dose against the studied dose. A magnesium product delivering 100mg per serving is not the product used in research that supported sleep benefits at 300–400mg, even though the label uses the same ingredient name. The chapter calls this the single most common way a supplement company tells the truth on the label while selling something that will not do what the research showed.

What does not make the cut

• Anything with a proprietary blend. If a company will not tell you the exact dose of each ingredient, it is hiding an underdose or a cost-cutting measure.
• Anything promising a specific number of pounds lost or an exact strength gain in a specific number of days. The training and the eating produce the outcome.
• The over-the-counter testosterone-booster category, which the chapter treats with specific skepticism — the handful of ingredients with real research support are already in the kit under their own names.
• Injectable peptides and hormone-adjacent compounds from gray-market channels. The book puts these entirely outside its scope: that is a conversation for a physician looking at your actual labs.

The Protocol

Chapter 5's protocol card, as written in the book:

• Creatine, 3–5g daily, any time, paired with an existing daily touchpoint like the coffee maker.
• Vitamin D, dosed off actual bloodwork rather than guesswork — retest at three months, then annually.
• Magnesium (glycinate or citrate), 300–400mg, an hour before the wind-down sequence.
• Omega-3, 1–2g combined EPA/DHA, with a meal containing fat.

Two operational notes the chapter adds. On mega-dosing: for water-soluble compounds like magnesium, excess mostly gets excreted and occasionally produces digestive discomfort for no additional gain; for fat-soluble compounds like vitamin D, excess can become genuinely harmful at high enough doses over time, which is the reason bloodwork-guided dosing beats internet-guided dosing. On the fasting windows from Chapter 4: creatine and magnesium contain no meaningful calories and do not trigger the insulin response fasting is partly designed to avoid, so they run on their normal schedule. Vitamin D and omega-3 absorb better with dietary fat present, which means taking them fasted wastes part of the dose rather than breaking anything.

The constraint is the point. Four items. Third-party tested, dosed at research levels. It supports the training, the eating, and the sleep — it does not replace any of them.