Search, compare and summarize 2,200+ published studies on molecular hydrogen (H2) and health.
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Count matching studies grouped by year, subject, design, delivery_method, outcome, country, condition or species — for trends and 'how many' questions. Unknown values are counted separately.
Max buckets returned (default 40)
Full-text search terms, e.g. 'exercise fatigue lactate'
Study design
Direction of the reported hydrogen effect
Who/what was studied
Condition hub slug or name, e.g. 'blood-pressure' or 'Blood Pressure' (see list_conditions)
How hydrogen was administered
Minimum participants/animals
Count matching studies grouped by year, subject, design, delivery_method, outcome, country, condition or species — for trends and 'how many' questions. Unknown values are counted separately.
| Argument | Type | Description |
|---|---|---|
| top | integer | Max buckets returned (default 40) |
| query | string | Full-text search terms, e.g. 'exercise fatigue lactate' |
| design | string | Study design |
| outcome | string | Direction of the reported hydrogen effect |
| subject | string | Who/what was studied |
| year_to | integer | |
| group_by* | string | |
| condition | string | Condition hub slug or name, e.g. 'blood-pressure' or 'Blood Pressure' (see list_conditions) |
| year_from | integer | |
| delivery_method | string | How hydrogen was administered |
| min_sample_size | integer | Minimum participants/animals |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"required": [
"group_by"
],
"properties": {
"top": {
"type": "integer",
"maximum": 100,
"minimum": 1,
"description": "Max buckets returned (default 40)"
},
"query": {
"type": "string",
"maxLength": 300,
"description": "Full-text search terms, e.g. 'exercise fatigue lactate'"
},
"design": {
"enum": [
"rct",
"controlled_trial",
"uncontrolled_trial",
"observational",
"case_report",
"meta_analysis",
"review",
"animal",
"in_vitro",
"other"
],
"type": "string",
"description": "Study design"
},
"outcome": {
"enum": [
"positive",
"neutral",
"negative",
"mixed"
],
"type": "string",
"description": "Direction of the reported hydrogen effect"
},
"subject": {
"enum": [
"human",
"animal",
"in_vitro",
"review"
],
"type": "string",
"description": "Who/what was studied"
},
"year_to": {
"type": "integer",
"maximum": 2100,
"minimum": 1900
},
"group_by": {
"enum": [
"year",
"subject",
"design",
"delivery_method",
"outcome",
"country",
"condition",
"species"
],
"type": "string"
},
"condition": {
"type": "string",
"maxLength": 100,
"description": "Condition hub slug or name, e.g. 'blood-pressure' or 'Blood Pressure' (see list_conditions)"
},
"year_from": {
"type": "integer",
"maximum": 2100,
"minimum": 1900
},
"delivery_method": {
"enum": [
"inhalation",
"drinking_water",
"hydrogen_saline",
"culture_medium",
"bathing",
"topical",
"tablet",
"mixed",
"other"
],
"type": "string",
"description": "How hydrogen was administered"
},
"min_sample_size": {
"type": "integer",
"minimum": 1,
"description": "Minimum participants/animals"
}
},
"additionalProperties": false
}Side-by-side evidence profiles for 2–4 groups of studies, e.g. inhalation vs drinking water for one condition, or two conditions. Each group is a set of filters merged over the optional shared filters.
| Argument | Type | Description |
|---|---|---|
| groups* | array | |
| shared | object | Filters applied to every group |
| top_studies | integer | Strongest studies listed per group (default 3) |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"required": [
"groups"
],
"properties": {
"groups": {
"type": "array",
"items": {
"type": "object",
"required": [
"label"
],
"properties": {
"label": {
"type": "string",
"maxLength": 60,
"minLength": 1
},
"query": {
"$ref": "#/properties/shared/properties/query"
},
"design": {
"$ref": "#/properties/shared/properties/design"
},
"outcome": {
"$ref": "#/properties/shared/properties/outcome"
},
"subject": {
"$ref": "#/properties/shared/properties/subject"
},
"year_to": {
"$ref": "#/properties/shared/properties/year_to"
},
"condition": {
"$ref": "#/properties/shared/properties/condition"
},
"year_from": {
"$ref": "#/properties/shared/properties/year_from"
},
"delivery_method": {
"$ref": "#/properties/shared/properties/delivery_method"
},
"min_sample_size": {
"$ref": "#/properties/shared/properties/min_sample_size"
}
},
"additionalProperties": false
},
"maxItems": 4,
"minItems": 2
},
"shared": {
"type": "object",
"properties": {
"query": {
"type": "string",
"maxLength": 300,
"description": "Full-text search terms, e.g. 'exercise fatigue lactate'"
},
"design": {
"enum": [
"rct",
"controlled_trial",
"uncontrolled_trial",
"observational",
"case_report",
"meta_analysis",
"review",
"animal",
"in_vitro",
"other"
],
"type": "string",
"description": "Study design"
},
"outcome": {
"enum": [
"positive",
"neutral",
"negative",
"mixed"
],
"type": "string",
"description": "Direction of the reported hydrogen effect"
},
"subject": {
"enum": [
"human",
"animal",
"in_vitro",
"review"
],
"type": "string",
"description": "Who/what was studied"
},
"year_to": {
"type": "integer",
"maximum": 2100,
"minimum": 1900
},
"condition": {
"type": "string",
"maxLength": 100,
"description": "Condition hub slug or name, e.g. 'blood-pressure' or 'Blood Pressure' (see list_conditions)"
},
"year_from": {
"type": "integer",
"maximum": 2100,
"minimum": 1900
},
"delivery_method": {
"enum": [
"inhalation",
"drinking_water",
"hydrogen_saline",
"culture_medium",
"bathing",
"topical",
"tablet",
"mixed",
"other"
],
"type": "string",
"description": "How hydrogen was administered"
},
"min_sample_size": {
"type": "integer",
"minimum": 1,
"description": "Minimum participants/animals"
}
},
"description": "Filters applied to every group",
"additionalProperties": false
},
"top_studies": {
"type": "integer",
"maximum": 10,
"minimum": 0,
"description": "Strongest studies listed per group (default 3)"
}
},
"additionalProperties": false
}Studies a given study cites, studies that cite it, and the most similar studies by shared health conditions.
| Argument | Type | Description |
|---|---|---|
| study* | string | Study id, slug, DOI or URL |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"required": [
"study"
],
"properties": {
"study": {
"type": "string",
"maxLength": 300,
"minLength": 1,
"description": "Study id, slug, DOI or URL"
}
},
"additionalProperties": false
}Evidence profile for a health condition hub: how many studies, human vs animal vs in-vitro, number of human RCTs and participants, outcome mix, delivery methods, publication years, data coverage, and the strongest studies.
| Argument | Type | Description |
|---|---|---|
| subject | string | Restrict the profile to one subject type |
| condition* | string | Condition hub slug or name (see list_conditions) |
| top_studies | integer | How many strongest studies to list (default 5) |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"required": [
"condition"
],
"properties": {
"subject": {
"enum": [
"human",
"animal",
"in_vitro",
"review"
],
"type": "string",
"description": "Restrict the profile to one subject type"
},
"condition": {
"type": "string",
"maxLength": 100,
"minLength": 1,
"description": "Condition hub slug or name (see list_conditions)"
},
"top_studies": {
"type": "integer",
"maximum": 20,
"minimum": 1,
"description": "How many strongest studies to list (default 5)"
}
},
"additionalProperties": false
}Size and makeup of the database: total studies, breakdown by subject and design, year range, and field coverage.
No arguments.
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"properties": {}
}Full record for one study: citation, design, population, H2 protocol (delivery, concentration, dosage), outcome, our plain-language summary and key finding, limitations, quality score with red flags, conditions/mechanisms, and links. Accepts an id, slug, DOI or study URL.
| Argument | Type | Description |
|---|---|---|
| study* | string | Study id, slug, DOI, or hydrogenstudies.com/study/... URL |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"required": [
"study"
],
"properties": {
"study": {
"type": "string",
"maxLength": 300,
"minLength": 1,
"description": "Study id, slug, DOI, or hydrogenstudies.com/study/... URL"
}
},
"additionalProperties": false
}Every health condition hub with its study count, evidence grade (where reviewed) and page URL. Use the slug as the `condition` filter.
No arguments.
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"properties": {}
}Find molecular hydrogen studies by keywords and/or filters. Returns compact study records (design, subject, sample size, delivery method, outcome, key finding, url). Sorted by relevance when a query is given, otherwise by strength of evidence.
| Argument | Type | Description |
|---|---|---|
| sort | string | |
| limit | integer | Default 10 |
| query | string | Full-text search terms, e.g. 'exercise fatigue lactate' |
| design | string | Study design |
| offset | integer | |
| outcome | string | Direction of the reported hydrogen effect |
| subject | string | Who/what was studied |
| year_to | integer | |
| condition | string | Condition hub slug or name, e.g. 'blood-pressure' or 'Blood Pressure' (see list_conditions) |
| year_from |
| integer |
| delivery_method | string | How hydrogen was administered |
| min_sample_size | integer | Minimum participants/animals |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"properties": {
"sort": {
"enum": [
"relevance",
"evidence",
"newest",
"quality"
],
"type": "string"
},
"limit": {
"type": "integer",
"maximum": 50,
"minimum": 1,
"description": "Default 10"
},
"query": {
"type": "string",
"maxLength": 300,
"description": "Full-text search terms, e.g. 'exercise fatigue lactate'"
},
"design": {
"enum": [
"rct",
"controlled_trial",
"uncontrolled_trial",
"observational",
"case_report",
"meta_analysis",
"review",
"animal",
"in_vitro",
"other"
],
"type": "string",
"description": "Study design"
},
"offset": {
"type": "integer",
"minimum": 0
},
"outcome": {
"enum": [
"positive",
"neutral",
"negative",
"mixed"
],
"type": "string",
"description": "Direction of the reported hydrogen effect"
},
"subject": {
"enum": [
"human",
"animal",
"in_vitro",
"review"
],
"type": "string",
"description": "Who/what was studied"
},
"year_to": {
"type": "integer",
"maximum": 2100,
"minimum": 1900
},
"condition": {
"type": "string",
"maxLength": 100,
"description": "Condition hub slug or name, e.g. 'blood-pressure' or 'Blood Pressure' (see list_conditions)"
},
"year_from": {
"type": "integer",
"maximum": 2100,
"minimum": 1900
},
"delivery_method": {
"enum": [
"inhalation",
"drinking_water",
"hydrogen_saline",
"culture_medium",
"bathing",
"topical",
"tablet",
"mixed",
"other"
],
"type": "string",
"description": "How hydrogen was administered"
},
"min_sample_size": {
"type": "integer",
"minimum": 1,
"description": "Minimum participants/animals"
}
},
"additionalProperties": false
}