Ticked off morning, noon and evening — and YUTHI keeps watch: whether it fits your meal, whether two supplements get in each other's way and whether you stay below the upper limit.
Three things running in the background — the sources are listed at the bottom of the page.
Every supplement gets its time of day: morning, noon or evening. Not everything has to be daily — if you take vitamin D once a week, it only shows up in your plan on that day.
You log capsules, tablets, mg or g — even half a tablet or 2.5 g of creatine. For something new, just take a photo of the tub.
The app places your supplements next to the day's meals and drinks. That way it notices, for example, when your iron came too close to your coffee.
At most five notes a day, each with the why — so it never turns into noise.
More is not always better. The app adds up what you took today and compares it with the upper limits of the European Food Safety Authority (EFSA).
Example: a day with three supplements
Gold means: above the upper limit. For magnesium, the 250 mg limit applies to supplements only, not to food.4 The app checks vitamin D, vitamin A, vitamin B6, zinc, magnesium and selenium, plus a guide value for iron.
The suggestions come from your everyday life: season, way of eating, training, medications and your meals from the last seven days. The app won't suggest what's already in your stack — or anything you've listed an allergy to in your profile.
If … the app looks at …
From your meals, the app only says something once all meals have values on at least five of the last seven days — otherwise the “deficiency” would be made up. A suggestion is no substitute for medical advice.
Supplements almost always trigger something. If you take creatine, the app raises your water goal by 400 ml, because creatine binds water in the muscle. And a caffeine capsule with an mg amount lands on the same caffeine curve as your coffee.
The common warning that creatine dehydrates you and causes cramps was not confirmed in controlled studies.8 If your kidney function is impaired, talk to a doctor first anyway.
79 supplements are in the catalogue, each with its effect, best time of day, dose, “Not together with …” and an honest rating of the evidence. For 14 of them, it also tells you which blood value you can have measured.
79 supplements
Weak doesn't mean bad — it means there aren't enough good studies yet. The app tells you exactly that instead of promising something.
The weekly plan colours every day for 4 weeks, 3 months, 6 months or a year. Days when your rhythm takes a break don't count as forgotten.
Days before your first intake stay empty instead of red: a gap that isn't one is not shown.
The profile tells you what a supplement can and can't do. The weekly plan shows whether you're sticking with it.
The app already calculates these connections today. A connection is not a cause — but it shows you where to look.
Creatine raises your water goal by 400 ml. Caffeine from capsules lands on the caffeine curve, and calories from supplements count in the same daily total as your drinks.
Your way of eating steers the suggestions: vegan or vegetarian moves vitamin B12 to the front. If your meals fall clearly below the reference value for iron, magnesium, zinc, B12 or folate on five of seven days, the app tells you.
Your logged blood values appear right in the “My stack” tab — with the same assessment as in the Blood values area.
You tick off your medications here too. If metformin, a stomach-acid blocker or the pill is on your list, the app names the nutrient you can discuss with your doctor.7
If you train at least 120 minutes a week, the app suggests creatine. From 150 minutes, it also checks whether you reach 1.4 g of protein per kg of body weight.9
The German Nutrition Society (DGE) gives 20 µg of vitamin D a day, but only for the case that the body makes none itself. Ordinary foods supply only about 1 to 4 µg a day. With plenty of sun on your skin, the need can be met without a supplement.1
Vitamin C improves the absorption of iron from plant foods. The DGE recommends 16 mg of iron a day for women before menopause and 11 mg for men. Menstruating women, vegetarians and vegans should pay particular attention to their intake.2
A Cochrane review of 78 trials with about 300,000 people found no benefit for mortality. In the most carefully conducted trials, mortality was even slightly higher with beta-carotene and vitamin E.3
Coffee and especially black tea reduce iron absorption. Keep them apart in time.2
A new article every Friday.
Nutrition & Supplements · MicronutrientsVitamin D in winter: do you really need supplements?From October to March the sun in our latitudes is too low for the skin to produce vitamin D. What this means, who is affected and when supplements make sense.Read more
Nutrition · MicronutrientsMagnesium: When it is really necessary and what the studies showMagnesium is often seen as a cure-all for fatigue, cramps and poor sleep. What does the evidence actually say? A sober look at the study data — and when a supplement might genuinely make sense.Read more
Nutrition · MicronutrientsAntioxidants: What Vitamin C, E and Beta-Carotene actually doAntioxidants are seen as guardians against free radicals and ageing. What is behind this concept — and why have large clinical trials with antioxidant supplements so often disappointed?Read moreEvery statement comes with its source; the figures are taken from the linked studies and opinions (checked on 1 November 2026). This is context from the research, not a diagnosis and no substitute for medical advice.
Get YUTHI from the App Store — iPhone first, from November 2026.
