H Hale

Medical sources & methodology

Sources checked October 27, 2026 · Just Hale LLC

Every health statement Hale shows — chat answers, insights, Digital Twin projections, Protocols, the weekly digest and the explanations on My Data — carries a Sources control linking to pages from the public-health and clinical authorities listed here. This page explains how Hale's information is produced and lists every source in the library (140 pages, each checked on October 27, 2026).

Methodology

What Hale is. Hale is an educational wellness tool for adults. It is not a medical device, it does not diagnose, treat or monitor any condition, and nothing in it replaces a clinician. Use what Hale shows to understand your numbers and to prepare better questions — and confirm anything you plan to act on with a licensed healthcare professional. In an emergency, call your local emergency number.

Where the information comes from. Hale's answers are written by an AI model run by Hale's AI provider, Anthropic, from what you share with Hale (your markers, your history, what you tell it) and general medical knowledge. Under each answer, insight, projection and plan, Sources lists pages from the public-health and clinical authorities in the library below — NIH's MedlinePlus and institutes, the CDC, the FDA, the WHO, health.gov, NICE, the U.S. Preventive Services Task Force, and peer-reviewed reviews on PubMed Central. Hale's server picks them by matching the topic of the question, the answer and your markers to this library; the AI never writes the links. A source is background reading on the topic from an authority, not a check of every sentence, and an AI answer can still be wrong or incomplete. Research mode also searches the web and lists the pages it read.

Typical ranges on My Data. The in-range and out-of-range flags use general adult reference ranges of the kind explained on the MedlinePlus test pages below. Labs use different methods and ranges, so the range printed on your own report — and your clinician's reading of it — come first. A flag means "worth asking about", not a diagnosis.

Insights and the weekly digest. Insights describe how your own readings have moved over time. The weekly digest's numbers — which markers moved, and how much of each pillar you ticked — are computed by Hale from your data; the AI writes only the headline and one suggestion, and a suggestion that names a dose or breaks the limits you gave Hale is removed before you see it.

How a Digital Twin projection is made. You describe a change and a number of weeks. An AI model drafts how each of your markers would likely move, from your current values, your profile and what published evidence says such a change typically does over that time. A second, separate AI review pass then checks each direction and size against that evidence and tones down anything overstated. The confidence shown is the model's own judgement, not a statistical interval, and the Twin is not a validated clinical prediction model: a projection is an estimate to weigh and to discuss with a clinician, not a forecast of your body.

How a Protocol is built. A Protocol is a week of concrete actions across training, nutrition, recovery and a fourth pillar, written by an AI model from your markers, your goal and your profile, and anchored to public guidance such as the Physical Activity Guidelines and the Dietary Guidelines. A second AI pass reviews it for safety and against the limits you set before you approve it. Supplements are educational only: Hale never gives a dose, never sells anything, and asks you to check any supplement with a clinician or pharmacist first, especially alongside a medicine or a condition.

Hale on Apple Watch. The Watch's health review and Ask Hale are written the same way as chat, from the same account data, and end with the publishers they draw on. On Apple Watch, each answer names its sources; the links themselves are here and in Hale on your iPhone, under Help & Guide › Medical sources & methodology.

Limits. AI output can be incorrect, out of date or wrong for you. Hale does not know your full medical history, and the readings it sees can be mistyped, misread from a photo or measured by a consumer device with its own error. The links below were checked on October 27, 2026; if one stops working, tell us at hello@allhale.app.

The source library

Reading your results and talking to a clinician

Cholesterol and lipids

Heart and blood pressure

Blood sugar and metabolism

Blood counts, vitamins and minerals

Thyroid and hormones

Liver and kidneys

Activity and fitness

Sleep, breathing and temperature

Body composition and hydration

Nutrition, alcohol and caffeine

Stress and recovery

Supplements

Prescription and compounded products

Not medical advice. Hale is an educational wellness tool for adults 18 and older. See the Medical Disclaimer.