Supplements & Functional Foods
What's worth taking, from which brand, at what $/unit. Third-party-tested only.
Supplements as a mechanical category, not a wellness category. What's worth taking, at what dose, from what brands, at what $/mg of bioactive. This is the high-AOV affiliate hub.
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The complete guide for this hub.
The Supplement Guide: The Short List Worth Paying For
An evidence-tiered guide to the supplements that earn their cost. Each entry: what the literature supports, the dose that matters, and a link to the $/g comparison. The ones to skip, and why.
Read the pillar →Find the topic that brought you here.
Each topic carries one buying decision with an evidence grade, plus the explainers behind it. From “what does magnesium do” to “which form to buy” in one step.
Creapure-certified creatine ranked by $/gram, with third-party testing status and brand transparency.
What we'd buy →- Does Creatine Make You Gain Weight? Water, Muscle, and Fat, Separated8 min
- Creatine for Women: What the Evidence Shows, and the Dose8 min
- Creatine Side Effects: What the Trials Actually Show9 min
- What Does Creatine Do? The Mechanism, Effects, and Dose9 min
- Does Creatine Cause Hair Loss? What the Evidence Actually Shows8 min
- How Much Creatine Should I Take? The Dose, by Bodyweight8 min
- When to Take Creatine: Timing, Rest Days, and What Matters8 min
Which magnesium form for which use case, absorption data, dose ranges, and brand recommendations.
What we'd buy →- When to Take Magnesium: Timing, Food, and Drug Spacing7 min
- How Much Magnesium Glycinate Should You Take? The Elemental Math8 min
- Magnesium-Rich Foods, Ranked by mg per Serving and Cost8 min
- Magnesium Deficiency Symptoms, Ranked by What the Evidence Shows8 min
- How Much Magnesium Per Day? The RDA, by Age and Sex8 min
- What Does Magnesium Do? The Functions, by the Evidence9 min
- Magnesium for Sleep: Which Form, What Dose, and the Evidence9 min
- What Is Magnesium Good For? The Benefits, by the Evidence8 min
Eight multivitamins scored on the 13 RDA-relevant nutrients an actual diet typically under-delivers. Methylated B-vitamins, the iron-versus-no-iron split, and the cost-per-day math.
What we'd buy →- Is Vitamin D the Same as D3? The Difference That Actually Matters7 min
- When to Take Vitamin D: With Fat, and Why Daily Beats a Bolus8 min
- Best Vitamin D Supplement, Ranked by $/1000 IU10 min
- What Does Vitamin D Do? The Functions, by the Evidence9 min
- How Much Vitamin D Per Day? The RDA, by Age and Need8 min
- How Much Vitamin D Per Day? The RDA, by Age and Need8 min
- Foods High in Vitamin D, Ranked by IU per Serving8 min
Yes: about 460 mg of sodium and 130 mg of potassium per litre, per USDA branded data. Set against an American football player losing sodium at roughly 1,290 mg an hour, the numbers explain what it is and is not for.
What we'd buy →Fish oil ranked by $/mg of combined EPA+DHA, the actual active dose, not per softgel. Triglyceride vs ethyl ester form and third-party testing flagged.
What we'd buy →Hydrolyzed collagen ranked by $/g of peptides, led by the honest evidence: modest skin/joint signal, and a low-DIAAS protein that doesn't count toward your protein target.
What we'd buy →Comparisons, explainers, and lists.
- 01Listicle7 min
Foods High in Pantothenic Acid (Vitamin B5): The Densest Sources
The adequate intake is just 5 mg a day, and the vitamin's name literally means everywhere, because it is in almost all foods. The ranking, why deficiency essentially never happens, and why B5 supplements for acne and hair have thin evidence.
- 02Listicle7 min
Foods High in Chromium: The Sources, and Why the Data Is Thin
The adequate intake is just 35 mcg a day for men and 25 mcg for women, and broccoli, whole grains, meat, and nuts cover it. Why the food data is unusually unreliable, why deficiency is rare, and what the evidence really says about chromium for blood sugar.
- 03Listicle7 min
Foods High in Thiamin (Vitamin B1): The Densest Sources, by Milligrams
The RDA is 1.2 mg a day for men and 1.1 mg for women, and pork, fortified grains, legumes, and sunflower seeds cover it easily. The mg-per-serving ranking, why refined grains are fortified for a reason, and who is actually at risk of deficiency.
- 04Listicle7 min
Foods High in Riboflavin (Vitamin B2): The Densest Sources, by Milligrams
The RDA is 1.3 mg a day for men and 1.1 mg for women, and dairy, eggs, organ meats, and fortified cereals cover it easily. The mg-per-serving ranking, why milk in clear bottles loses it, and why bright yellow urine is nothing to worry about.
- 05Listicle8 min
Foods High in Lutein: The Densest Sources for Eye Health, by Milligrams
Lutein and its partner zeaxanthin are the carotenoids that concentrate in the retina, and cooked greens like kale and spinach top the list. The mg-per-serving ranking, why egg yolk punches above its weight, and what the AREDS2 eye-health evidence actually shows.
- 06Listicle8 min
Probiotic Foods: Which Fermented Foods Actually Contain Live Cultures
A probiotic food has to contain living microbes at the point you eat it, which rules out most shelf-stable and heat-treated fermented products. The foods that qualify, why yogurt and kefir lead, and why fermented does not always mean probiotic.
- 07Listicle8 min
Prebiotic Foods: The Fibers That Feed Your Gut Bacteria, Ranked
Prebiotics are the specific fibers your gut bacteria ferment, and chicory root, garlic, onion, leeks, and under-ripe bananas are the densest. The ranking, how prebiotics differ from fiber and probiotics, and why ramping up slowly matters.
- 08Listicle8 min
Resistant Starch Foods: The Sources, and Why Cooling Matters
Resistant starch escapes digestion and feeds your gut bacteria, and cooking then cooling potatoes, rice, and pasta creates more of it. The ranking, the four types, and what the evidence shows for blood sugar and gut health.
- 09Listicle8 min
Foods High in Phosphorus: The Densest Sources, by Milligrams
The RDA is 700 mg a day, and dairy, meat, fish, nuts, and beans all supply it in quantity. The mg-per-serving ranking, why the phosphate additives in processed food matter more than the natural kind, and who actually needs to limit it.
- 10Listicle7 min
Foods High in Manganese: The Densest Sources, by Milligrams
The adequate intake is 2.3 mg a day for men and 1.8 mg for women, and mussels, nuts, whole grains, and legumes clear it with room to spare. The mg-per-serving ranking, why deficiency is essentially unheard of, and why the real risk is excess from water and supplements.
- 11Listicle8 min
Foods High in Tryptophan: The Densest Sources, by Milligrams
This essential amino acid is the raw material for serotonin, melatonin, and niacin, and any protein-rich diet supplies far more than the roughly 280 mg a day an adult needs. The mg-per-serving ranking, why the turkey sleepiness story is a myth, and why carbs matter for getting it into the brain.
- 12Listicle8 min
Foods High in Lysine: The Densest Sources, by Grams
Lysine is the essential amino acid that cereals run short on, which is why the meat-and-legume story matters. The per-serving ranking, why grain-heavy plant diets need beans to balance, and what the evidence really says about lysine for cold sores.
- 13Listicle8 min
Foods High in Vitamin E: The Densest Sources, by Milligrams
The RDA is 15 mg of alpha-tocopherol a day, and a single ounce of sunflower seeds or almonds covers roughly half of it. The mg-per-serving ranking, why the oils and nuts dominate, and why deficiency is rare but supplements can backfire.
- 14Listicle8 min
Foods High in Vitamin B6: The Densest Sources, by Milligrams
The RDA is 1.3 mg a day for most adults, and chickpeas, tuna, salmon, and chicken breast each cover a third to half of it per serving. The mg-per-serving ranking, why the vitamin is spread across animal and plant foods, and why the supplement upper limit matters.
- 15Listicle8 min
Foods High in Niacin (Vitamin B3): The Densest Sources, by Milligrams
The RDA is 16 mg for men and 14 mg for women, and a single serving of tuna, chicken breast, or turkey covers most of it. The mg-per-serving ranking, why the body also makes niacin from tryptophan, and why the flushing dose is a drug, not a food.
- 16Listicle7 min
Foods High in Biotin (Vitamin B7): The Densest Sources, by Micrograms
The adequate intake is just 30 mcg a day, and beef liver, eggs, and salmon cover it easily. The mcg-per-serving ranking, why deficiency is rare, why raw egg whites work against you, and why hair-growth megadoses are mostly wasted.
- 17Listicle8 min
Foods High in Vitamin K: The Densest Sources, by Micrograms
The adequate intake is 120 mcg/day for men and 90 mcg for women, and cooked leafy greens dominate while fermented natto tops the list. The mcg-per-serving ranking, why K1 and K2 count the same, and what people on blood thinners actually need to do.
- 18Listicle8 min
Foods High in Copper: The Densest Sources, by Micrograms
The daily copper target is 900 mcg for adults, and beef liver, oysters, dark chocolate, cashews, and seeds are the densest sources. The mcg-per-serving ranking, why one serving of liver covers a week, and how too much zinc can drain it.
- 19Listicle8 min
Foods High in Potassium: The Densest Sources, by Milligrams
The adequate intake is 3,400 mg/day for men and 2,600 mg for women, and white beans, potatoes, dried apricots, and leafy greens beat the famous banana per serving. The mg-per-serving ranking, why most adults fall short, and how boiling leaches it out.
- 20Listicle8 min
Foods High in Vitamin B12: The Densest Sources, by Micrograms
The RDA is 2.4 mcg/day, and clams, beef liver, and oily fish are the densest sources. The mcg-per-serving ranking, why B12 is almost absent from plant foods, and when vegetarians and vegans need a supplement.
- 21Listicle8 min
Iron-Rich Foods: The Densest Sources, by Milligrams
The RDA is 8 mg/day for men and 18 mg for women aged 19-50, and clams, liver, and fortified cereal top the list, but heme iron from meat absorbs far better than the non-heme iron in beans and spinach. The mg-per-serving ranking, why absorption matters more than the label, and how vitamin C changes the math.
- 22Listicle8 min
Calcium-Rich Foods: The Densest Sources, by Milligrams
The RDA is 1,000 mg/day for most adults and 1,200 mg after 50, and dairy, canned fish with bones, calcium-set tofu, and low-oxalate greens are the densest sources. The mg-per-serving ranking, why spinach barely counts, and how to hit the number without a supplement.
- 23Listicle8 min
Foods High in Vitamin A: The Densest Sources, by Micrograms
The RDA is 900 mcg RAE for men and 700 mcg for women, and liver, sweet potato, and carrots lead by a wide margin, but preformed retinol from animal foods and beta-carotene from plants are counted differently. The mcg-per-serving ranking, why the two forms are not equal, and the one food to limit.
- 24Listicle9 min
Foods High in Antioxidants: What the Numbers Actually Show
Spices, berries, dark chocolate, and coffee top the antioxidant charts, but the USDA withdrew its ORAC database in 2012 because test-tube antioxidant capacity does not predict what happens in the body. The highest-antioxidant foods by measured content, why high-dose supplements failed in trials, and what the evidence actually supports.
- 25Listicle8 min
Foods High in Iodine: The Richest Sources, by Micrograms
The daily iodine target is 150 mcg for adults, and seaweed, cod, dairy, and iodized salt are the richest sources. The mcg-per-serving ranking, why plants are usually low, and how iodized salt quietly does most of the work.
- 26Listicle8 min
Foods High in Selenium: The Densest Sources, by Micrograms
The daily selenium target is 55 mcg for adults, and Brazil nuts, tuna, sardines, and organ meats are the densest sources. The mcg-per-serving ranking, why one Brazil nut can cover a day, and how much is too much.
- 27Listicle8 min
Foods High in Choline: The Densest Sources, by Milligrams
The daily target is 550 mg for men and 425 mg for women, and egg yolks, beef liver, and meat are the densest sources. The mg-per-serving ranking, why most people fall short, and how to hit it without liver.
- 28Listicle8 min
Foods High in Folate: The Densest Sources, by Micrograms
The daily target is 400 mcg for adults and 600 mcg in pregnancy, and lentils, beef liver, leafy greens, and beans are the densest sources. The mcg-per-serving ranking, why cooking destroys folate, and folate versus folic acid.
- 29Listicle9 min
Anti-Inflammatory Foods: What the Evidence Actually Supports
No single food lowers inflammation, but a pattern built on oily fish, extra-virgin olive oil, colorful plants, nuts, and whole grains does. The foods with the strongest evidence, why the pattern beats any one item, and what the research really shows.
- 30Explainer8 min
Ashwagandha Benefits: What the Trials Show, and the Liver Signal
Pooled across 12 trials in 1,002 people, stress fell with a standardised mean difference of 1.75 and anxiety by 1.55, but heterogeneity was above 83 percent and the certainty of evidence was rated low. The dose that was tested, and the hepatic case series.
- 31Explainer8 min
Turmeric With Black Pepper: The 2,000 Percent Figure, and What It Buys
The 2,000 percent number is real and comes from one 1998 study using 20 mg of piperine. Without it, 8 g of curcumin left no detectable serum trace in 24 volunteers. The absorption problem, and the liver signal that came with the fix.
- 32Explainer8 min
How Much Vitamin A Per Day: The Target, and the Two Forms That Behave Differently
The RDA is 900 mcg RAE a day for men and 700 mcg for women, and the upper limit applies only to the preformed retinol in animal foods and supplements. The numbers, why beta-carotene from plants cannot overdose you, and why liver and pregnancy need special care.
- 33Explainer7 min
How Much Vitamin B12 Per Day: The Number, and Why Absorption Is the Catch
The RDA is just 2.4 mcg a day, but the body absorbs only a small amount per dose, which is why supplements list far higher numbers. The target, why B12 comes only from animal foods and fortified products, and who genuinely needs to supplement.
- 34Explainer7 min
How Much Zinc Per Day: The Target, and Why the Upper Limit Matters
The RDA is 11 mg a day for men and 8 mg for women, and the tolerable upper limit is 40 mg. The numbers, why too much zinc causes copper deficiency, why vegetarians need more, and what the cold-lozenge evidence really shows.
- 35Explainer7 min
How Much Vitamin C Per Day: The Real Numbers, Not the Megadose Myth
The RDA is 90 mg a day for men and 75 mg for women, and the body cannot store much beyond a saturation point around 200 to 400 mg. What the numbers are, why smokers need more, why megadoses are mostly excreted, and when high doses cause harm.
- 36Explainer8 min
How Much Calcium Per Day: The Numbers by Age, and the Supplement Debate
The RDA is 1,000 mg a day for most adults and 1,200 mg for older women and men, but more is not better. The numbers by age, why food beats supplements, the vitamin D connection, and the evidence behind concerns about calcium pills and the heart.
- 37Explainer8 min
How Much Iron Per Day: The Numbers by Age and Sex
The RDA is 8 mg a day for men but 18 mg for premenopausal women, one of the biggest sex differences in nutrition. The numbers, why heme and non-heme iron differ, why vitamin C helps, and why you should not supplement without testing.
- 38Explainer7 min
How Much Potassium Per Day: The Target Most People Miss
The adequate intake is 3,400 mg a day for men and 2,600 mg for women, and most people fall well short. The numbers, why potassium and sodium work as a pair for blood pressure, why supplements are capped, and who must actually limit it.
- 39Explainer8 min
Zinc Deficiency Symptoms, Ranked by What the Evidence Shows
Frequent infections, a blunted sense of taste and smell, and slow-healing skin come first, because zinc runs immune cells, wound repair, and hundreds of enzymes. The zinc deficiency symptoms with real evidence, who is at risk, and why a normal blood test can miss it.
- 40Explainer8 min
Vitamin B12 Deficiency Symptoms, Ranked by What the Evidence Shows
Fatigue and tingling in the hands and feet come first, and the danger is that nerve damage can arrive before anemia and become permanent. The B12 deficiency symptoms with real evidence, who is at risk, and why a normal serum B12 can miss it.
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