Supplements and vitamins on the method: what you need, what you don't, and how to check

When sugar and flour disappear, insulin drops, and the kidneys stop retaining sodium. Potassium and magnesium are washed out along with salt — hence the headaches, weakness, and cramps of the first weeks, known as the “keto flu.” This is not a vitamin deficiency; it is an electrolyte issue, and it is resolved with salt and food, not pills. On the other hand, a low-carb plate — meat, fish, eggs, vegetables, nuts — is richer than a standard diet in most vitamins: it contains plenty of B12, iron, zinc, vitamin K, and fat-soluble vitamins. The real gaps for women following the method are the same as for everyone: vitamin D, magnesium, omega-3 and, in case of heavy periods, iron. For electrolytes, see electrolytes and water; for initial symptoms, see keto flu.

The method's rule: a supplement is needed when three things are present at the same time — a deficiency shown by a test, a matching symptom, and evidence that the supplement corrects that deficiency. Vitamin D according to a 25(OH)D test, magnesium according to symptoms and diet (a blood test for it is not very informative), omega-3 when you eat fish less than twice a week, iron according to ferritin, and B12 when taking metformin or omeprazole and after 50. Everything else — multivitamins, “fat burners,” detox teas, L-carnitine, goji berries, and collagen “for weight loss” — is money down the toilet and sometimes an extra burden on the liver. Read the breakdown: five supplements that work and what doesn't work and why. The general question is do you need supplements on a low-carb diet. The full section is what you need and what you don't.

Vitamin D is the only one worth taking for almost everyone from October to April: there is no sun, yet vitamin D supports bones, immunity, and mood. Magnesium is a mineral that leaves the body in urine faster on a low-carb diet; without it, there may be nighttime cramps, poor sleep, and chocolate cravings. Omega-3 is an anti-inflammatory fat supplied by oily fish twice a week, or by capsules if you do not eat fish. B vitamins and B12 are sufficient in a meat-based diet, but metformin, omeprazole, and age over 50 can deplete B12 even with a good diet. Section: vitamins and minerals. Iron in women is a separate topic: iron and fatigue.

A headache on the third day, weakness during a workout, nighttime calf cramps, palpitations when standing up — none of this means that “your body doesn't accept it”; it means you may be short of salt, potassium, and magnesium. On a low-carb diet, you need 3-5 g of salt per day — more than standard recommendations suggest because the kidneys no longer retain as much of it. Get potassium from avocado, leafy greens, salmon, and mushrooms, not tablets. Water: 2-3 liters, with lemon and a pinch of salt. Details: salt on a low-carb diet, potassium from food, cramps and headaches, water in hot weather and during workouts. Basic articles: electrolytes on LCHF and how much water to drink.

Four numbers that replace half the medicine cabinet: 25(OH)D, ferritin, B12, and TSH. The first three indicate direct deficiencies; the fourth concerns the thyroid, which can disguise itself as fatigue and “not enough vitamins.” You cannot assess magnesium with a blood test — 99% of it is inside cells, so blood may show a normal level even in case of deficiency. An omega-3 index is tested rarely; it is easier to count servings of fish. How to get tested, what the reference ranges are, and what to do with the result — tests before supplements. About the thyroid — the thyroid and weight.

Fat-soluble supplements — D, omega-3, K2 — should be taken with food containing fat; otherwise half of it will pass through unused. Magnesium in the evening: it relaxes you and helps you sleep. Iron every other day, on an empty stomach or with vitamin C, separately from coffee, tea, and calcium by at least one hour. B12 in the morning. Add salt to food and water, rather than taking it by the spoonful. Creatine at any time; the important thing is to take it every day. And one rule above all: introduce one new supplement every two weeks so you can understand what exactly worked or caused a side effect.

The what you need and what you do not section covers principles and testing. The vitamins and minerals section covers D, magnesium, omega-3, and B12 separately. The electrolytes and water section covers salt, potassium, and water, without which the first weeks of the method are difficult. The foundation of everything is the method page and low-carb diet.