Which apps log vitamins and minerals?

Only the detailed loggers, Cronometer most completely, and a few others for a subset of nutrients. Most food-logging apps write energy and macros and nothing else, so most users have no micronutrient data even when they log.

Are the units consistent?

Each field has one unit, milligrams or micrograms, matching the platform's own type. Vitamin A, D, K, B7, B9, B12, chromium, iodine, molybdenum, and selenium are in micrograms; the rest are in milligrams.

Vitamins and minerals

What the micronutrient biomarkers measure

Daily logged intake of each vitamin and mineral, on days with at least one log, over a midnight-to-midnight window in the profile’s local time zone. None requires a wearable.

Vitamins

Biomarker	Unit
`vitamin_a_intake`	Micrograms
`vitamin_c_intake`	Milligrams
`vitamin_d_intake`	Micrograms
`vitamin_e_intake`	Milligrams
`vitamin_k_intake`	Micrograms
`thiamin_intake` (B1)	Milligrams
`riboflavin_intake` (B2)	Milligrams
`niacin_intake` (B3)	Milligrams
`pantothenic_acid_intake` (B5)	Milligrams
`vitamin_b6_intake`	Milligrams
`biotin_intake` (B7)	Micrograms
`folate_intake` (B9)	Micrograms
`vitamin_b12_intake`	Micrograms

Minerals

Biomarker	Unit
`calcium_intake`	Milligrams
`iron_intake`	Milligrams
`magnesium_intake`	Milligrams
`phosphorus_intake`	Milligrams
`potassium_intake`	Milligrams
`sodium_intake`	Milligrams
`zinc_intake`	Milligrams
`chloride_intake`	Milligrams
`copper_intake`	Milligrams
`manganese_intake`	Milligrams
`chromium_intake`	Micrograms
`molybdenum_intake`	Micrograms
`selenium_intake`	Micrograms
`iodine_intake`	Micrograms

Access
API	`GET /api/v1/profile/biomarker/{externalId}?categories=nutrition` plus one `types` parameter per field and a date range
Webhook	`BiomarkerCreatedIntegrationEvent`. Entries update in place, upsert on `id`.

Data sources

Platform	Record	Notes
iOS, HealthKit	The `dietary` type for each nutrient	Written by detailed loggers, Cronometer above all. Most apps write none of these.
Android, Health Connect	`NutritionRecord` fields	Same, plus Samsung Health for a subset
Direct integrations	None
Phone only	Manual entry, or entries your own app writes

How Sahha calculates vitamins and minerals

Pick one source for the day, per nutrient. The source with the highest daily total of that nutrient wins.
Sum the winning source’s entries with an end time inside the local day.

Absence means no source logged that nutrient that day, which is the normal state for nearly every profile.

Interpreting the values

Coverage decides everything. Before building on any of these, count profiles with a value in the last 30 days. It will be a small number.

Two fields have a product use beyond a breakdown table. Sodium and potassium relate to blood pressure and are the micronutrients a cardiovascular feature might reasonably surface. Iron and vitamin D are the ones supplement features most often target.

The rest belong in a table, not a feature. A nutrient breakdown view for users who log in detail is the honest ceiling.

None of the 27 is a score factor or has a trend or comparison insight. The supplement recommendations by archetype guide shows how to build supplement features from archetypes rather than from logged micronutrients, which is the path that works for users who do not log.

Use cases

A breakdown table for detailed loggers. Show every field with a value for the day, hide the rest. Do not render 27 blank rows.

GET /api/v1/profile/biomarker/{externalId}?categories=nutrition&types=sodium_intake&types=potassium_intake&types=iron_intake&types=vitamin_d_intake&startDateTime=2026-08-27&endDateTime=2026-09-03

A sodium note next to blood pressure. For users who log and own a cuff, the two together are a coherent story. For everyone else, neither field exists.

Limitations

Logged only, and rarely logged.
Per-nutrient winners. A day’s nutrients can come from different apps.
Absence is not zero for any field.

Macronutrients for the energy-bearing nutrients
Energy intake for how nutrition sources and selection work
Supplement recommendations by archetype for the archetype-driven alternative
Data dictionary in the developer docs