Thyroid Disease (General)
Thyroid Disease (General) is a broad category within metabolic health, used here for thyroid-related outcomes rather than one specific diagnosis. The evidence described focuses on laboratory markers such as TSH and TPOAb.
See how Thyroid Disease (General) fits within the broader category of metabolic health.
This list shows research findings, not treatments. Nothing here replaces medical care. If you have this condition, talk to a doctor.
May not suit people with this condition
Supplements and practices linked to problems for people with this condition.
Red Light Therapy (Photobiomodulation)practiceUnclear
A systematic review pooling randomized and non-randomized human studies advises caution with photobiomodulation in people with Hashimoto's Thyroiditis until more safety evidence is available. This is a precaution based on limited data, not a tested contraindication.
Open the Red Light Therapy (Photobiomodulation) page
The expert view shows every study, dose protocol and source.
What may help
Interventions recorded as helping with this conditionNothing in this library is currently recorded as helping with Thyroid Disease (General). That means nothing is on file — not that nothing exists. Only 107 of 338 catalogued supplements have a written-up profile so far.
What to avoid
Interventions recorded as making it worse1 listedHighest probability
- →PracticesRed Light Therapy (Photobiomodulation)CertaintyLowSourceClinical
A systematic review pooling randomized and non-randomized human studies advises caution with photobiomodulation in people with Hashimoto's Thyroiditis until more safety evidence is available. This is a precaution based on limited data, not a tested contraindication.
Who was studied
- People with a condition
- Hashimotos Thyroiditis
Study result
Authors advise caution and state that PBM ideally would be avoided in this population until more safety evidence is available; this is a precaution based on limited data, not a tested contraindication.
Open Red Light Therapy (Photobiomodulation)Rationale
Authors advise caution and state that PBM ideally would be avoided in this population until more safety evidence is available; this is a precaution based on limited data, not a tested contraindication.
How to read the evidence
Evidence tier — overall strength of the evidence for the whole compound
- StrongWell established — backed by strong, consistent human research.
- ModerateSome genuine support, but mostly from small or lower-quality studies. Promising, not proven.
- PreliminaryEarly-stage evidence — a promising hypothesis, not an established effect yet.
- LimitedVery limited evidence — treat this as a hypothesis, not proof.
- InsufficientNot enough good evidence to draw conclusions yet.
Certainty — how sure we can be that the effect is real
- Very highVery sure — strong, consistent evidence
- HighFairly sure — consistent evidence from good studies
- MediumModerately sure — new studies could change this
- LowNot sure — little or mixed evidence
- Very lowVery unsure — almost no usable evidence
Source — where the data comes from
- Meta-analysisPooled analysis of many trials — the strongest evidence
- RCTRandomized controlled trial — a strong human study design
- ClinicalA human clinical study
- Reference knowledgeFrom general health-science or pharmacology references, not a study of this exact claim
- Animal researchStudied in animals, not humans
- Community reportsAggregated user reports — anecdotal signal, not evidence
- TheoreticalMechanism-based reasoning, not yet tested
Study grade — quality of each underlying study (A best, D weakest)
- AHigh-quality — strong, consistent human trials
- BGood — solid evidence with some limitations
- CModerate — limited, small, or mixed-quality studies
- DWeak — preliminary, indirect, or animal-only
Confidence — how strongly the sources back a finding
A 0–100 score from study quality and agreement
Most supplement evidence is graded C–D. Read it as preliminary signal, not proof.
Full write-up
What is it
Thyroid Disease (General) is a broad category within metabolic health, used here for thyroid-related outcomes rather than one specific diagnosis. The evidence described focuses on laboratory markers such as TSH and TPOAb. Selenium has been studied in euthyroid and subclinically hypothyroid individuals without THRT; changes in these markers should not be read as a diagnosis or as proof of improved symptoms.
Evidence-backed options
Selenium is the option associated with general thyroid disease in this section. The reported findings concern TSH and TPOAb, with particular mention of euthyroid and subclinically hypothyroid individuals who were not receiving THRT. This makes the evidence narrower than the broad condition label and does not establish that the same findings apply to every thyroid disorder, treatment status, or clinical setting.
The findings do not specify what was taken, for how long, or how quickly any changes appeared. They also do not establish whether changes in TSH or TPOAb translate into meaningful clinical outcomes, or how the findings should be interpreted for people receiving THRT. A clinician can help place any option in the context of the specific thyroid condition, laboratory findings, and current treatment.
What to avoid
These supplements are flagged because they may affect thyroid hormone production, regulation, metabolism, or the way thyroid medicines work. Chlorella can contain variable amounts of iodine, which may complicate thyroid function management, particularly with hyperthyroidism or iodine-sensitive conditions. Maca Root contains glucosinolates with goitrogenic potential and may interfere with thyroid hormone synthesis in susceptible people. High-dose Green Tea Extract (EGCG) may also affect thyroid hormone synthesis and thyroid medication absorption.
Several items may affect thyroid hormone handling or medication efficacy through metabolism or absorption. Green Tea Extract (EGCG), Quercetin, Alpha-Lipoic Acid (ALA), and Lemon Balm (Melissa) have been flagged for possible effects on these pathways. These concerns may be relevant across thyroid conditions, because changes in absorption or metabolism could affect thyroid function or the effectiveness of treatment.
Hormonal or immune effects are another reason for caution. Panax Ginseng may affect thyroid hormone levels and immune function, with possible relevance to autoimmune thyroid conditions. Rhodiola Rosea may affect thyroid hormone levels and TSH, while Tongkat Ali (Eurycoma) may influence hormonal balance in ways that could interfere with thyroid management or medication efficacy.
The relevance of these concerns can differ between hypothyroidism, hyperthyroidism, autoimmune thyroid conditions, and iodine-sensitive conditions. Anyone with a thyroid condition should discuss these supplements with a clinician, especially when thyroid medication or ongoing monitoring is involved.