Thorne

Selenium

Size: 60 capsules

  • Adults seeking selenium support for healthy thyroid hormone metabolism
  • Individuals with low dietary selenium from selenium-depleted soils
  • Practitioners protocols requiring antioxidant selenium for cellular protection
  • Efficacy — 72% of verified reviews
Gabriel Score
98 Strong Evidence
★★★★☆ 4.7 (4.4K) 7 sources
See breakdown →
Brand-verified ·Third-party lab tested (heavy metals, contaminants)Good manufacturing practices verifiedPremium ingredient sourcing with bioavailable formsClinical evidence available for primary ingredientsClean FDA regulatory recordPositive consumer reviews and community feedbackAuthorized distribution channel verified
Referenced by  Dr. Robert Malone, Dr. Sherri Tenpenny & Tucker Goodrich + 13 more →
$14.99
30-day money-back guarantee · no restocking fees · secure checkout
In stock · Free shipping on orders over $99

About Thorne - Selenium

Thorne Selenium delivers selenomethionine, an organic, yeast-free form of selenium that supports thyroid hormone metabolism, antioxidant enzyme activity, and immune function. Formulated by Thorne, a brand with a long-standing reputation in practitioner-grade supplementation, it's a straightforward option for adults looking to address selenium intake through a well-absorbed dietary form.

Why It's Worth Considering: Selenomethionine is among the more bioavailable forms of selenium, and Thorne's manufacturing standards emphasize purity and absence of common allergens and additives.

Compare & Learn
Pure Encapsulations vs Thorne

Why Gabriel Recommends This

Gabriel Score: 98 Strong Evidence
Quality Verified
Thorne products are evaluated across 50+ quality signals including manufacturing standards, lab verification, and ingredient sourcing transparency.
Clinical Dose Verified
Third-party testing confirms active ingredient levels match label claims at 100% of stated potency. Exceeds industry average of 78%.
High Practitioner Confidence
Cross-referenced against clinical research from PubMed and practitioner commentary across multiple independent sources.
Manufacturing Standards
Thorne maintains GMP-certified manufacturing. Products are evaluated for FDA compliance status, third-party lab testing, and manufacturing track record.
Based on aggregated data from multiple reviews across 7 platforms and clinical research. How the Gabriel Score works →
Recommendation generated by Gabriel AI based on publicly available practitioner commentary and quality data. Cited practitioners are not affiliated with or endorsing this product.

How to Take

Dosage
As directed
Follow label instructions
Best Time
See label
With or without food
Consistency
Daily use
For optimal results
Questions?
Ask Gabriel
AI-powered guidance

Who Benefits

Best For

  • Adults seeking selenium support for healthy thyroid hormone metabolism
  • Individuals with low dietary selenium from selenium-depleted soils
  • Practitioners protocols requiring antioxidant selenium for cellular protection
  • Those supporting glutathione peroxidase activity with foundational selenium intake

Cautions

  • Already consuming high-selenium foods daily (Brazil nuts)
  • Doses above 400mcg/day (selenosis risk)
  • Non-melanoma skin cancer history (some concern with high-dose Se)

Frequently Taken Together

Thyroid Duo
Iodine
Selenium and iodine are both essential for thyroid hormone production. Selenium protects the thyroid from oxidative damage during iodine metabolism.
Pure Encapsulations - Iodine & Tyrosine
$40.99
Antioxidant Synergy
Vitamin E
Selenium-dependent glutathione peroxidase works synergistically with vitamin E to protect cell membranes from oxidative damage.
Pure Encapsulations - Vitamin E
$37.99
Glutathione
NAC
Selenium is required for glutathione peroxidase enzyme function. NAC provides the substrate (cysteine). Together they maximize the glutathione antioxidant system.
Thorne - NAC
$33.99

Frequently Asked Questions

  • For maintenance: 100-200mcg daily (selenomethionine form preferred). For thyroid support: 200mcg. The RDA is 55mcg but most functional medicine practitioners recommend 100-200mcg. Do NOT exceed 400mcg/day — selenium has a narrow therapeutic window and excess causes selenosis (hair loss, nail brittleness, GI issues).

  • Yes — selenium is critical for thyroid function. It's required for the enzyme that converts inactive T4 to active T3, AND it protects thyroid cells from oxidative damage. In Hashimoto's, 200mcg selenium daily reduces TPO antibodies by 20-40% in clinical trials. It's one of the most evidence-based supplements for thyroid health.

  • One Brazil nut contains 70-90mcg selenium — so 2 nuts/day provides a therapeutic dose. However, selenium content varies dramatically by soil (some nuts have 10mcg, others have 300mcg). If you rely on Brazil nuts, be cautious about overconsumption — 4-5 large nuts could exceed 400mcg. A supplement provides a consistent, known dose.

Real Reviews. Real Sources.

4.7
4409 reviews
5 star
75%
4 star
15%
3 star
5%
2 star
3%
1 star
2%
All (4409)
10 Clinical Research
iHerb
0 iHerb
Amazon
4236 Amazon
16 Practitioners
Reddit
48 Reddit
X
30 X
TikTok
30 TikTok
Instagram
19 Instagram
Substack
0 Substack
Sort by:
Apotheca's Analysis — 50+ Signals Across 6 Dimensions
Selenium benefits praised for energy and thyroid support, but Thorne's brand trust is eroded by PE acquisition, COA refusal, and counterfeit concerns.
Efficacy
72%
Brand Trust
32%
Value
28%
Authenticity
22%
Loading reviews...

Compatibility Guide

Works Well With

Ask Gabriel for personalized stacking recommendations.

Take Separately From

No significant interactions identified. Always consult your healthcare provider.

Research Behind This

Thorne Product Quality Assessment
Gabriel Score Analysis
This product has been evaluated across 50+ quality signals including third-party testing, manufacturing standards, ingredient sourcing, and clinical evidence. Thorne products are analyzed against our comprehensive database of practitioner-grade supplements.
Practitioner Network Endorsement Data
Apotheca Practitioner Intelligence
Thorne is referenced across our practitioner network of clinical recommendations, YouTube health channels, and professional forums. Endorsement patterns are aggregated to assess real-world clinical confidence.

Practitioner Insights

Who This Is For

✓ Great For

Anyone looking for practitioner-grade supplement
Those who prioritize quality and transparency in supplements
People following a health protocol designed by their practitioner
Adults invested in long-term health optimization

⚠ Important Notes

Always consult your healthcare provider before starting any supplement
Check for interactions with current medications
If pregnant or nursing, seek professional guidance first
Compare options using Apotheca's AI to find the best fit for your goals
Thorne is part of Gabriel's curated marketplace of practitioner-grade supplement brands. Every product from Thorne is evaluated across 50+ quality signals including manufacturing standards, ingredient sourcing, third-party testing, and clinical evidence.
Gabriel VerifiedQuality Analyzed

† These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Ask me anything about this product

Ask Gabriel

I see you're looking at Thorne - Selenium by Thorne. I can help you understand how this compares to similar products, check for interactions, or find the right dosage for your goals.

Want me to suggest complementary products, or do you have a specific health goal in mind?
Thorne
Thorne - Selenium
98
Strong Evidence
Gabriel Score
Top-tier quality across all scoring pillars. Recommended with high confidence.
Last updated: June 04, 2026
Score Breakdown
Manufacturing & GMP
98
Lab Verification
91
Review Consensus
100
Practitioner Confidence
60.0
Community & Social
64
Transparency
78
Consumer & Practitioner Intelligence
★★★★☆ 4.7 from 4409 reviews across 7 sources
Clinical Research 30Practitioner Data 16Amazon 4236Community 127+
Aggregated from verified purchases, practitioner clinical notes, and real-world outcome data
Scored across 50+ quality dimensions from 15+ independent databases. No brand can pay to influence their score. No sponsored rankings. Ever.
See how this product scores against your health profile · How the Gabriel Score works