Medical and AI Disclaimer

Last updated: October 8, 2026. Part of the Terms of Service.

1. Not medical advice, not a medical device

• Diurnal.ai, published by PUREQUAD SRL (Romania), is a lifestyle and wellness organiser. It is intended for general wellness only: keeping a routine, remembering supplements, tracking meals, sleep and training, and keeping your own health documents organised for your doctor.
• It is not a medical device under the EU Medical Devices Regulation (EU) 2017/745 or the US Federal Food, Drug and Cosmetic Act, and it is designed within the US FDA's general wellness policy: it makes no claims to diagnose, cure, mitigate, prevent or treat any disease or condition, and it is not intended to be used for those purposes.
• Nothing in the app, on this website, in Marc's replies or in any report is medical, nutritional, pharmaceutical or genetic advice, diagnosis or treatment, and no doctor-patient, dietitian-client or other professional relationship is created by using them.
• Always consult a qualified health professional before starting, stopping or changing any supplement, medication, diet or exercise programme, and before acting on any lab value or genetic result. Never disregard professional advice or delay seeking it because of something you read in the app.

2. Supplements and medications

• Diurnal.ai does not sell, prescribe or recommend specific medications. It helps you keep the routine you and your health professional have decided on, and offers general educational information about supplements. Marc is instructed never to tell you to start, stop or change a prescription medicine, and not to suggest new supplements during pregnancy or breastfeeding, for people under 18 or alongside prescription medicines; for a family member under 18, the app also drops any "add a supplement" suggestion. He is instructed never to suggest a food containing an allergen you listed, but always check labels yourself.
• Suggested amounts stay within commonly used, label-recommended ranges and mention published upper limits as general information. Your own needs depend on your age, weight, conditions, pregnancy or breastfeeding, medications and interactions, which only a professional can assess.
• United States: statements about dietary supplements in the app have not been evaluated by the Food and Drug Administration. Dietary supplements are not intended to diagnose, treat, cure or prevent any disease.
• European Union: food supplements are not a substitute for a varied, balanced diet and a healthy lifestyle; do not exceed the recommended daily dose stated on the product; keep out of reach of young children.
• Label readings (brand, dose and ingredient list scanned from a box) may be incomplete or wrong; always check the physical label.
• Timing hints (for example taking iron away from coffee, or a fat-soluble vitamin with a meal) only look at when items are scheduled. They are general information at the level of public fact sheets (US National Institutes of Health, Office of Dietary Supplements), they leave medicines out, and they are not advice about interactions or about your health.
• Stock counts and refill reminders are simple arithmetic from the numbers you enter. A reorder link is a link you added yourself; we earn nothing from it.

3. Nutrition estimates and reference intakes

• Calorie and macronutrient estimates from photos and text descriptions are approximations. Portion sizes, cooking methods, dressings, oils, seeds and drinks are frequently misjudged or missed; when the app says it could not identify something, tell it, and log what it missed.
• Your calorie target is computed with the Mifflin-St Jeor formula and an activity factor. Reference daily intakes (protein and water scaled to your body weight, vitamins and minerals) come from the European Food Safety Authority's Dietary Reference Values, the US National Institutes of Health DRI tables and the International Society of Sports Nutrition's protein position stand. They are population references for healthy adults, not individual prescriptions, and they do not apply in pregnancy, kidney disease and many other conditions.
• Weekly report ratings (nutrients on track or low, energy versus target, pro- or anti-inflammatory tendency of the foods you logged) are estimates built only from what you logged, and are partial when logs are missing. The inflammation classification reflects general nutrition research about food groups and is not a measurement of inflammation in your body.

4. Lab results, genetic information and your cycle

• Lab results are informational and not interpreted. The app extracts values from lab reports you upload and marks whether each is inside or outside the reference range printed on your own report. It can list what each marker measures in general (only the marker names go to the AI, never your values). It does not tell you what a value means for your health, what caused it or what to do. Reading errors are possible; always refer to the original report and your doctor.
• Comparisons between two reports are made on your phone, from the numbers and the printed ranges only, without any AI, and are meant to be shown to your doctor together with what you took and ate in between. The app never links a value to a supplement or a food.
• Genetic interpretations are informational. They cover a small panel of 42 nutrition-related variants (vitamins, minerals, lactose, caffeine, omega-3 and similar) and are general lifestyle information. No variant linked to disease risk, medicines or mental health is read. They are not a genetic test for any disease or a diagnosis, and they do not replace genetic counselling. Strand and reporting conventions vary between DNA services.
• Cycle, fertility and pregnancy information are estimates. Period, ovulation and fertile window predictions are calendar averages from the period starts you log and your settings (ovulation tests, temperatures and days you mark are kept as a record only) and can be wrong, especially with irregular cycles, after stopping hormonal contraception, after pregnancy or around perimenopause. They are not a method of contraception and must not be used to plan or avoid a pregnancy. Pregnancy week information is general and does not replace prenatal care.

5. Sport, training, routes and caffeine

• Talk to a doctor before you start a new training programme or make your training much harder. Stop at once and get medical help if you feel chest pain or pressure, unusual shortness of breath, dizziness, faintness, palpitations, or sharp or unusual pain.
• The exercise library, trainings, tips, stretching suggestions and Marc's workouts, workout summaries and coach notes are general fitness information. Diurnal.ai is not a personal trainer, coach or physiotherapist, and nothing in it is adapted to an injury or a health condition.
• Resting heart rate and heart rate variability (HRV) read from Apple Health or Health Connect are shown as plain numbers next to your own recent average. They are not a measurement of fitness, recovery, stress or heart health, and they are not a medical assessment. Heart rate, energy (calories), distance, pace and climb are estimates from your watch or phone.
• Suggested loops are calculated automatically from OpenStreetMap data and may be unsafe or not allowed: check traffic, terrain, weather and access yourself before and during your activity.
• The caffeine guide uses the European Food Safety Authority's reference amounts for healthy adults (up to 400 mg a day and 200 mg at once; up to 200 mg a day in pregnancy) and typical amounts per drink. Real amounts vary by product, and your own tolerance, medicines or conditions may call for less. It is general information, not medical advice.
• Lab recheck reminders only remind you to ask your doctor whether to recheck a marker; they do not say that a recheck is needed.
• Trainings other people share with you (with a code or on their sport profile) are their own content. We do not check them, they are not professional advice and they are not made for you. Before you use one, check that the exercises, sets, reps, rest and especially the weights suit you, and stop any exercise that hurts.
• Workouts, totals and kudos in the Sport community show only what your sport friends chose to post. They are not a measure of anyone's fitness or health; do not train harder than is right for you to keep up with others.

6. The AI assistant: how Marc works and what he cannot do

• Marc's replies, and the estimates, readings and reports generated by the app, are produced by a large language model (OpenAI's GPT-4o mini family, through our server) from the context you provide. Large language models can produce text that sounds confident but is inaccurate, outdated, incomplete or invented. Verify anything that matters, and prefer your doctor's or pharmacist's answer over Marc's.
• Marc is instructed to stay within wellness topics (including sport training, where he is told to send you to a doctor or physiotherapist for pain, a possible injury, dizziness or chest symptoms), to remind you to confirm with a professional whenever doses, medication, symptoms or conditions come up, to keep to safe ranges, to avoid your listed allergens, to use clean and respectful language and never to diagnose or prescribe. These instructions reduce but do not eliminate errors. Safety rules (emergencies, prescription medicines, pregnancy, breastfeeding, people under 18, upper intake levels, disordered eating), a topic policy and a profanity filter are applied on our server and in the app.
• Marc does not know anything you have not told him or logged, cannot see your medical records, cannot examine you, and does not learn from other users' conversations. He keeps short notes about your preferences to stay consistent; you can switch them off in Settings ("What Marc can use") or delete them.
• Routine proposals, meal logs and workouts suggested by Marc are applied only when you accept them. You are responsible for what you accept.
• If you connect your own AI provider with your own key, its behaviour, accuracy and terms are that provider's, not ours.
• No AI output is reviewed by a health professional before you see it. If an answer looks wrong, unsafe or offensive, press and hold it in the chat and choose "Report this answer"; we review every report.

7. Reminders and notifications

Reminders are scheduled on your phone and depend on the device's settings, battery optimisation, permissions and time zone. They may be delayed or missed. Do not rely on the app as the only reminder for medication that must be taken on time.

8. Family profiles

Routines you keep for a child, a parent or another person are managed under your responsibility. Children, pregnant or breastfeeding people and the elderly have specific needs; confirm every product and dose with their doctor or pharmacist.

9. Results and testimonials

Any results, examples or testimonials shown in the app or on the website illustrate what a routine can look like; they are not a promise that you will experience the same outcome. Individual results vary.

10. External links and third-party content

Links to studies, products or other websites are provided for information. We do not control them, do not endorse them and are not responsible for their content or accuracy. The same applies to trainings, names and posts that other users share in the app.

11. Contact

PUREQUAD SRL, Romania (company details). E-mail: support@diurnalapp.ai.