The minimal health stack, ranked by evidence: an S-to-C tier list

Ask ten biohackers for “the minimal stack” and you’ll get ten different lists, most sourced from a podcast rather than a paper. So this is the opposite approach: I pulled the actual randomized trials behind the commonly recommended supplements and ranked them S-tier down to C-tier, based on the strength of the evidence rather than the size of the marketing budget.

How to read this: every supplement below has two parts. First a short, plain-language summary with the dose and the one thing you need to know. Then a grey box — “The studies behind it” — with the trial names, numbers, and caveats, for anyone who wants to check the work. Skip the grey boxes entirely and you’ll still get the full picture.

The stack at a glance

Tier	What	For	Dose	Watch out for
S	Protein (whey if needed)	Keeping muscle after 50	1.0–1.2 g/kg/day	Kidney disease → ask a doctor
S	Creatine monohydrate	Muscle & strength, 50+	3–5 g/day	Kidney disease → ask a doctor
S	Vitamin D3	Correcting a deficiency	1,000–2,000 IU/day	Test your level first
A	High-polyphenol olive oil	Cardiovascular events, inflammation	20–30 ml/day, ≥250 mg/kg	Polyphenol level matters, not volume
A	Omega-3 (EPA)	High triglycerides, heart risk	Trial dose: 4 g/day	Blood thinners → ask a doctor
A	Magnesium bisglycinate	Sleep quality	250 mg elemental/day	Works best if you’re low
B	Creatine	Brain/cognition	3–5 g/day	Only holds up in older adults
B	Creatine	Artery stiffness	3–5 g/day	Early evidence, older adults only
B	Vitamin K2 (MK-7) + D3	Artery calcification	360–720 mcg/day MK-7	Warfarin → do not combine
B	Collagen peptides	Joints, bone, nails	Target-specific: 40 mg UC-II to 15 g	Not a whey substitute
B	Vitamin C	Required partner for collagen	50 mg is enough; more is harmless	Deficiency rare in Europe
B	Magnesium oxide	Constipation	Per label	Different form than for sleep
B	Magnesium (from food)	Lower colorectal cancer risk	Dietary intake	Observational evidence only
B	Glycine + NAC (GlyNAC)	Cell energy (ATP)	2.4–7.2 g/day	One research group so far
C	Boron	Free testosterone (men)	3–10 mg/day	Very small studies
C	Zinc	Immune support	10–15 mg/day	Stay under 40 mg total
C	NAC (on its own)	General antioxidant	—	Evidence is medical, not general

What the tiers mean

• S-tier — large trials or repeated meta-analyses. The kind of evidence guidelines get built on.
• A-tier — solid trial evidence, but for a narrower group or a specific outcome.
• B-tier — real trials pointing the same way, but small, short, or a modest effect.
• C-tier — small pilot studies or mechanism plus animal data. Interesting, not settled.

The ranking is about strength of evidence, not how good the biochemical story sounds. A compound can have a beautiful mechanism and still land in C-tier if the human trials are small or contradicted.

S-Tier

Enough protein — the one that makes the rest work

1.0–1.2 g of protein per kg of bodyweight per day after ~50. Around 25 g per meal. Whey powder if you can’t hit it with food.

Strictly speaking protein is food, not a supplement — but it belongs at the top of this list because it’s the thing most people over 50 quietly fall short on, and because creatine barely works without it. Here’s the problem: as you age, your muscles become less responsive to the protein you eat. A 71-year-old needs roughly 140% more protein in a meal than a young adult to trigger the same muscle-building response. That’s called anabolic resistance, and it’s why the standard adult recommendation (0.8 g/kg) is now widely considered too low for older people.

Practical version: for an 80 kg person that’s 80–96 g of protein a day, spread across meals rather than dumped into dinner. If you eat plenty of meat, fish, eggs and dairy you may already be there. If you don’t — smaller appetite, skipped breakfast, mostly plant-based — a scoop of whey is a cheap, boring, effective way to close the gap. It isn’t magic; it’s just protein in convenient form. And it’s the foundation the creatine entry below actually depends on.

One important distinction: collagen powder does not do this job. It’s an incomplete protein — low in leucine, missing tryptophan — so it won’t drive muscle protein synthesis the way whey does. Collagen has its own separate uses (covered further down), but it is not a whey substitute.

Creatine monohydrate — muscle and strength

3–5 g per day. No loading phase needed.

This is the best-supported supplement on the list. From around age 50 you start losing muscle and strength every year; creatine combined with strength training measurably slows that down. It’s cheap, it’s been studied for decades, and it’s safe for healthy kidneys — if your blood test shows a bump in creatinine after starting, that’s a measurement quirk of how creatine breaks down, not damage. If you already have kidney disease, check with your doctor first.

Vitamin D3 — but only if you’re actually low

1,000–2,000 IU per day. Test your blood level first.

Here’s the honest version: D3 reliably fixes the problems that a deficiency causes — bone, muscle, immune function. What it doesn’t appear to do is deliver extra benefits once your levels are already fine. The huge VITAL trial gave 2,000 IU daily to nearly 26,000 people and found no reduction in cancer or heart disease in a mostly non-deficient group. So the value is in correcting a real shortfall, not in taking it as a general upgrade. In Northern Europe, winter deficiency is common enough that testing is worth it. I’ve written separately about correcting a severe deficiency quickly, including how I overshot my own target while following careful advice.

A-Tier

High-polyphenol olive oil — the hardest endpoints on this list

20–30 ml per day, taken straight. What matters is the polyphenol content, not the volume.

Olive oil is unusual here for one reason: the kind of evidence behind it. Almost everything else on this list rests on surrogate markers: a biomarker moving the right way, a plausible mechanism. Olive oil has hard clinical endpoints from a large randomized trial. In PREDIMED, roughly 7,400 people at high cardiovascular risk were randomized, and the extra virgin olive oil group had about 30% fewer heart attacks, strokes and cardiovascular deaths. Those aren’t lab values — those are events you actually want to avoid.

On top of that it carries something almost no supplement has: an approved EFSA health claim. The EU permits the statement that olive oil polyphenols protect blood lipids from oxidative stress, at 5 mg or more of hydroxytyrosol and derivatives per 20 g of oil. EFSA rejects this kind of claim routinely; the fact that this one passed means a panel judged there to be an established cause-and-effect relationship from dose-dependent human evidence.

So why A-tier and not S? Two reasons, and they’re the rubric doing its job. PREDIMED was retracted and republished in 2018 after randomisation irregularities at some sites — the reanalysis held, but it isn’t untouchable. And the benefit was shown in a high-risk population eating a Mediterranean pattern, not in the general population as a standalone habit. Strong trial evidence, narrower group: that’s the definition of A.

The therapeutic dose, precisely: the EFSA threshold is 5 mg hydroxytyrosol and derivatives per 20 g of oil (20 g ≈ 22 ml). That’s the number that matters, and it means volume alone tells you nothing — a supermarket oil at 100 mg/kg won’t reach it at any sensible dose, while a strong early-harvest oil clears it several times over in a single tablespoon. Practical version:

• Aim for ≥250 mg/kg polyphenols — the level at which an oil can legally carry the EU claim.
• 400+ mg/kg is the threshold popularised by Bryan Johnson’s protocol, who takes ~30 ml daily of an oil testing around 425 mg/kg — roughly 12 mg polyphenols per dose.
• 1,000+ mg/kg exists in early-harvest single-variety oils (Coratina from Puglia is the classic example, sometimes exceeding 1,200 mg/kg). At that strength, 20 ml delivers around 25 mg — several times the EFSA threshold, at lower calorie cost.

One trap worth knowing: different labs measure polyphenols differently. The same oil can read ~400 mg/kg by HPLC and ~1,000 mg/kg by NMR. So compare numbers only when you know the method — check the certificate of analysis rather than the marketing line. Also, polyphenols degrade with light, heat, oxygen and time, so the harvest-date number isn’t what’s in the bottle a year later. Buy dark glass or bag-in-box, store it cool and dark, and prefer recent harvests.

Omega-3 (EPA) — for high triglycerides and heart risk

Context-dependent. The big trial used 4 g/day of purified EPA — that’s prescription strength.

Omega-3 is a good example of why “does it work?” is the wrong question. In people with high triglycerides and high cardiovascular risk, a high dose of purified EPA cut major heart events by about a quarter. In the general, lower-risk population, standard fish oil doses showed no meaningful benefit in two large trials. So it helps if you’re in the high-risk group or eat very little oily fish — it’s not a universal heart upgrade. The ratio side of this matters too, which I covered when I looked at what the research actually says about seed oils and omega-6 intake. If you’re on blood thinners, talk to your doctor.

Magnesium bisglycinate — sleep quality

250 mg elemental magnesium per day. Bisglycinate form.

A real effect, but a modest one — and it works best if you were running low to begin with. In a trial of 155 poor sleepers, magnesium bisglycinate improved insomnia scores more than placebo, with most of the improvement showing up in the first two weeks. The people who benefited most were those with low magnesium in their diet. If you track recovery, better sleep tends to show up there as well — I wrote up what actually moved my own numbers in this HRV experiment. Note the form: bisglycinate is well absorbed and gentle on the stomach, which is exactly what you want here (see the gut section below for why oxide is a different tool entirely).

B-Tier

Creatine — for the brain

Same 3–5 g/day. But the honest answer is: unproven, except possibly in older adults.

This one is a good lesson in how science corrects itself. A 2024 meta-analysis reported that creatine improved memory, attention and processing speed — and it got a lot of coverage. Then reviewers found a statistical problem: several studies had counted multiple test results from the same participants as if they were separate people, which inflates the apparent evidence. When the numbers were re-run properly, the memory benefit disappeared, except specifically in older adults. Europe’s food safety authority reached the same conclusion. So: promising in older people, not established in general.

Creatine — artery stiffness

Same dose. Early evidence, and it seems to depend on who you are.

Stiffer arteries are a real marker of cardiovascular ageing. A small trial in older men found a week of creatine improved stiffness measures, and another found it blunted the temporary stiffness spike after heavy exercise. But a study in young healthy adults found nothing at rest. Read that as: possibly useful for older or training populations, not a general “creatine is good for your arteries” claim.

Vitamin K2 (MK-7) with D3 — artery calcification

360–720 mcg/day MK-7 in the trials. Mixed results, and one hard rule.

The theory is elegant: K2 activates a protein that keeps calcium in your bones and out of your artery walls. The trials are less tidy. The largest one, in 389 older men over two years, found no overall effect on calcium buildup in arteries — though a subgroup that already had a lot of calcification did see slower progression. Bone markers respond fairly consistently; hard clinical outcomes haven’t been demonstrated. Worth knowing, not worth overselling.

⚠️ Important: K2 works directly against warfarin — doctors literally use vitamin K to reverse warfarin when someone is bleeding. If you take warfarin or another vitamin-K antagonist, do not add K2 without talking to your prescriber.

Collagen peptides — joints, bone and connective tissue

Dose depends entirely on the target: 40 mg UC-II or 10 g for joints, 5 g for bone, 2.5 g for nails. Always with vitamin C. Not a whey substitute.

Collagen is one of the most over-marketed supplements on the shelf, and there is still a real evidence base underneath the noise — but it’s target-specific, and the dose that works for one thing isn’t the dose for another. The short version:

Goal	Dose	Evidence strength
Joints / cartilage	10 g/day hydrolysed, or 40 mg/day UC-II	Strongest case
Bone (postmenopausal)	5 g/day	Strong, but one ingredient maker
Tendons (around training)	15 g, 60 min before loading	Synthesis markers only
Nails	2.5 g/day	Well-supported, underrated
Skin	2.5–10 g/day	Modest, funding-biased
Muscle	—	Doesn’t work; use whey

The confusion worth clearing up first, because it costs people money: whey and collagen are not interchangeable. Whey is a complete protein — all essential amino acids, plenty of leucine — which is what triggers muscle building. Collagen is an incomplete protein: no tryptophan, and it supplies only around a third of the leucine you’d get from an equivalent amount of whey protein. It will not build muscle the way a complete protein does. What it does have is an unusual amino acid profile (heavy on glycine, proline and hydroxyproline) that supplies building blocks for connective tissue. Different tool, different job — take them together, not one instead of the other.

Joints are collagen’s best use. Two quite different approaches both hold up: around 10 g/day of hydrolysed collagen works nutritionally, with absorbed peptides accumulating in cartilage; or just 40 mg/day of undenatured type II collagen (UC-II), which works by an immune mechanism and beat glucosamine plus chondroitin head-to-head for knee osteoarthritis.

Bone density after menopause is the finding that makes collagen worth a second look. Most nutrients at best slow bone loss; actually increasing density is rare. In a 12-month double-blind trial, 131 postmenopausal women taking 5 g/day of specific collagen peptides gained bone density in the spine (+3.0%) and femoral neck (+6.7%) while the placebo group lost it. Bone formation markers moved the right way, and a four-year follow-up showed the gains held.

Nails are the underrated one: 2.5 g/day for 24 weeks increased nail growth by 12% and cut breakage by 42%. Skin is the weakest case — and the most heavily marketed. A 2025 meta-analysis separated trials by funding source and found that in studies not funded by supplement makers, the effect disappeared.

⚠️ Quality matters more here than for most supplements. One analysis of 28 top-selling collagen products found measurable arsenic in 64%, lead in 37% and mercury in 34%. Marine collagen carries the higher heavy-metal risk because it bioaccumulates. Buy third-party-tested bovine collagen with a published heavy-metal certificate of analysis.

The full breakdown — skin, bones, joints, muscle, nails and hair, the funding-bias problem, sourcing, and my own protocol — is in the dedicated collagen article.

Vitamin C — mostly as collagen’s required partner

Deficiency is rare in Europe. But if you take collagen, take vitamin C with it — 50 mg is enough, and more does no harm.

Vitamin C and collagen belong together, and it’s stronger than a “works nicely with” claim: your body physically cannot finish building collagen without vitamin C. Collagen isn’t assembled like a normal protein — after the chains are made, specific building blocks have to be chemically modified before the whole thing can fold into its stable rope-like structure. The enzymes that do that modification need vitamin C to function. No vitamin C, no stable collagen. That’s literally what scurvy is: connective tissue falling apart.

The practical consequence: taking collagen peptides without vitamin C is giving your body the raw materials while withholding a tool it needs to use them. The studied amount is small — around 50 mg alongside the collagen is plenty to keep those enzymes running. Higher doses are common and harmless within sensible limits, they just aren’t doing more for collagen specifically.

On its own, though, vitamin C earns a modest ranking. Frank deficiency is uncommon on a normal European diet, and it doesn’t do much extra once you’re topped up — the same “corrects a shortfall, doesn’t upgrade a sufficient person” logic as vitamin D. It’s cheap and safe, so pairing it with collagen is sensible; taking grams of it daily as a general health measure isn’t supported.

Magnesium and your gut — two different things

For constipation: magnesium oxide. For everything else: bisglycinate. These are not interchangeable.

This trips people up constantly, so it’s worth being clear. Magnesium oxide works as a laxative because it’s poorly absorbed — it stays in your intestine and pulls water in with it. That’s great if you’re constipated and useless if you’re trying to raise your body’s magnesium levels. Bisglycinate is the opposite: well absorbed, gentle, gets into your system. Pick the form based on what you actually want.

On colorectal cancer: there’s a consistent finding that people who eat more magnesium have somewhat lower rates of colorectal cancer — roughly 10–12% lower in the highest-intake groups, strongest for colon cancer specifically. The mechanism makes sense (magnesium is involved in DNA repair and controlling inflammation). But be careful how much weight you put on it: this comes from observational studies tracking diet, not from trials where people were given magnesium supplements and followed for cancer outcomes. Real signal, modest size, not proof.

Glycine + NAC (GlyNAC) — cellular energy

2.4–7.2 g/day combined, glycine and NAC in a 1:1 ratio.

This is the most interesting finding in the whole list, and also the one most in need of confirmation. As you age, your mitochondria — the parts of your cells that make energy — get worse at burning fat for fuel and start leaning on glucose instead. In a trial of older adults, GlyNAC reversed that: fat-burning capacity improved by 78% over 16 weeks, back to levels seen in young adults. What makes it unusual is that the researchers looked inside muscle tissue and found the actual energy-production machinery being rebuilt, including the enzyme that physically manufactures ATP. The placebo group showed none of it. The catch: it’s 24 people, from one lab. Impressive, not yet confirmed.

C-Tier

Boron — free testosterone in men

3–10 mg/day in the studies.

Boron is cheap, found in fruit and nuts, and has a wide safety margin — but the evidence is genuinely thin. The most-quoted study gave 10 mg a day to eight men for one week and found free testosterone went up and estradiol went down. Eight men, one week, no placebo group. That’s a hint, not a finding. It’s a reasonable cheap add-on if you’re curious; it’s not something to build a plan around.

GlyNAC — the broader anti-ageing claims

Same 2.4–7.2 g/day, but a much weaker claim than the energy one above.

Separate from the specific mitochondrial finding, GlyNAC is often sold as reversing multiple “hallmarks of ageing” at once — inflammation, insulin resistance, cognition, strength. That broader claim leans on the same small trial, and a bigger follow-up found the benefit concentrated in people who started out with high oxidative stress and low glutathione. In other words: helps most if you actually need it, less impressive across the general population.

Zinc — and why more is not better

10–15 mg/day. Keep your total from food plus supplements under 40 mg.

Fixing an actual zinc deficiency clearly helps immune function. The problem with zinc isn’t whether it works — it’s people taking too much for too long. Zinc and copper compete for the same absorption route in your gut, so sustained high doses can quietly cause a copper deficiency, which shows up as anaemia and low white blood cells. This has landed people in hospital. Modest dose, don’t stack multiple products containing it, and don’t run high doses for months.

NAC on its own

Strong evidence — but not for what people take it for.

NAC is genuinely important medicine: it’s the hospital treatment for paracetamol overdose and works as a mucolytic. As a general “antioxidant for longevity” supplement, the evidence is much thinner than its reputation suggests. Most of NAC’s recent positive ageing data comes from the GlyNAC combination above, paired with glycine — not from NAC alone.

Timing: where it matters, and where it doesn’t

Most supplement timing advice is noise. Two cases here are worth getting right, and they point in opposite directions — one where timing genuinely matters, and one where the received wisdom is largely a marketing story.

Collagen + vitamin C: 60 minutes before training — timing really matters

Take 15 g collagen or gelatine with ~50 mg vitamin C, roughly an hour before you load the tendon.

This one has a specific, well-explained mechanism. After you swallow collagen, the relevant amino acids — glycine, proline, hydroxyproline — take about 60 minutes to peak in your blood. So the hour isn’t arbitrary: you’re timing that peak to land exactly when you start training. The second half of the reason is anatomical: tendons and ligaments have poor blood supply at rest, and exercise is what opens up circulation to them. Deliver the building blocks while the tap is open, and they actually reach the tissue.

In the trial that established this, 15 g of vitamin-C-enriched gelatine an hour before six minutes of rope skipping doubled the blood marker for collagen synthesis compared to placebo. Dose mattered too — 15 g worked, 5 g didn’t produce the same effect. That’s why this number is higher than the 5 g daily bone protocol above: different goal, different study, different amount. The 5 g is a steady daily intake for bone; the 15 g is a training-day dose timed to the session. This is one of the few timing protocols in nutrition with a clear reason behind it rather than a vague “for best results.”

Whey after training: much less critical than you’ve been told

Total daily protein is what matters. The 30-minute window is largely a myth.

The idea that you must drink a shake within half an hour of your last set or waste the session is probably the most successful piece of marketing in supplement history — and the evidence doesn’t support it. Here’s the twist that unravelled it: a meta-analysis of 23 controlled trials found that the studies apparently showing a post-workout timing benefit had a hidden flaw. The groups told to eat right after training were also eating 25% more protein per day overall. Once total daily intake was accounted for, the timing advantage vanished completely — for muscle growth and for strength. What looked like a window was a dosing difference in disguise.

A direct test made the same point: ten weeks of training with whey taken before versus after the session produced no meaningful difference in muscle or strength. Muscle protein synthesis stays elevated for many hours after training, so the practical window is more like 4–6 hours around your session than 30 minutes after it. If you ate protein an hour or two before training, those amino acids are still circulating anyway.

None of that makes a post-workout shake wrong — it’s a convenient, easy-to-remember habit. It just isn’t load-bearing. If you’re going to spend effort optimising something, spend it on hitting your daily protein target and spreading it across meals, not on watching the clock.

Frequently asked questions

If I only took two things from this list, what would they be?

On evidence strength alone: creatine monohydrate, and vitamin D3 after testing your level. Those two have the biggest, most repeated evidence bases here, and creatine has an unusually clean safety record after decades of study. Hitting your daily protein target isn’t a supplement, but it outranks both.

Why is vitamin D3 S-tier if VITAL found no benefit?

Because the S-tier claim is narrow: correcting an actual deficiency. VITAL tested D3 in people who mostly weren’t deficient and found no bonus on top. That’s a different question from “does fixing a deficiency help,” which it does.

Why does GlyNAC show up twice, in two different tiers?

Because it’s two claims wearing one name. The narrow one — that it rebuilds mitochondrial energy machinery, measured directly in muscle tissue — has decent trial evidence and sits at B-tier. The broad one — that it reverses ageing across many systems at once — leans on the same small study and needs independent replication, so it stays C-tier.

Can collagen replace my protein powder?

No. Collagen is missing tryptophan and low in leucine, so it doesn’t trigger muscle protein synthesis the way whey does. It counts toward your total grams of protein but does a different job. Take them together if you want both muscle and connective tissue support.

Can I take several of these together?

Most have no known problem interaction. Two real exceptions: K2 with warfarin or any vitamin-K antagonist, and long-term high-dose zinc, which can crowd out copper. Beyond that, watch for the same ingredient appearing in several products and pushing your total dose higher than you think.

Does S-tier mean I should take it?

No. The tier reflects how strong the evidence is, not whether it fits you. D3 is S-tier for people who are deficient — if you’re already fine, more does little. Test where you can, and food before supplements.

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