Does this contain L-selenomethionine or the DL form?

Yes, selenomethionine is verified using USP methodologies. Thorne Research uses inductively coupled plasma optical emission spectrometry (ICP-OES) and inductively coupled plasma mass spectrometry (ICP-MS) to analyze each incoming batch of L-selenomethionine used in this product. SOPs are in compliance with USP standards. Clean Break Seller · March 4, 2015

IS this verified by USP?

Yes, selenomethionine is verified using USP methodologies. Thorne Research uses inductively coupled plasma optical emission spectrometry (ICP-OES) and inductively coupled plasma mass spectrometry (ICP-MS) to analyze each incoming batch of L-selenomethionine used in this product. SOPs are in compliance with USP standards.

Is this product yeast-free?

Yes. Though I switched from this brand to "NOW" at 100 mcg (take 2 instead) and it states on the front of the bottle "Yeast Free".

From what source is this seleniomethionine?

I don't know. But recommended by a certified nutritionist.

Thorne Serene Supplement, 200 mcg, Mineral Supplement, 60 Capsules, Set of 1 [Total 60 Capsules/60 Day Supply]

Thorne Serene Supplement, 200 mcg, Mineral Supplement, 60 Capsules, Set of 1 [Total 60 Capsules/60 Day Supply]

Product ID: 725796299

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Details

Brand
THORNE
Diet Type
Gluten Free
Flavor
Unflavored
Item Form
Capsule
Item Weight
18 g
Material Type Free
No artificial

⚖️200 mcg pure selenium per capsule

🗓️60-day supply, 1 capsule daily

🇺🇸Made in USA, trusted by pros

Description

⚡ Elevate your thyroid game with clean, pro-grade selenium power!

CLEAN PURE FORMULA - Free from gluten, soy, dairy, and major allergens—crafted for sensitive, health-conscious professionals.
HOLISTIC WELLNESS BOOST - Supports healthy skin, hair, and liver detoxification for a radiant, balanced lifestyle.
SLEEK EASY DAILY DOSE - Small, unflavored capsules designed for effortless swallowing and zero aftertaste—no excuses to skip.
PRO GRADE QUALITY ASSURANCE - Manufactured in the USA with Mayo Clinic partnership backing, trusted by elite athletes and teams.
PRECISION POWERED THYROID SUPPORT - 200 mcg of bioavailable selenium to optimize thyroid function and hormonal balance.

Thorne Serene Supplement delivers a precise 200 mcg dose of selenium per capsule, supporting optimal thyroid health and overall wellness. With a clean, allergen-free formula made in the USA and trusted by professional sports teams and Mayo Clinic, it offers a 60-day supply of easy-to-swallow capsules designed for daily use. Ideal for millennials seeking a pure, effective mineral boost to maintain hormonal balance, skin vitality, and detox support.

Specifications

ASIN	B00B5N9IDQ
ASIN	B00B5N9IDQ
Age Range Description	Adult
Amazon Bestseller	#121,492 in Health & Personal Care ( See Top 100 in Health & Personal Care ) #6 in Selenium Mineral Supplements
Brand Name	THORNE
Country of Origin	USA
Country of Publication	USA
Customer Reviews	4.7 4.7 out of 5 stars (4,112)
Diet Type	Gluten Free
Flavor	Unflavored
Is Discontinued By Manufacturer	No
Item Form	Capsule
Item Weight	18 g
Item model number	M225-R
Manufacturer	Thorne Research
Manufacturer	Thorne Research
Manufacturer Part Number	M225
Material Type Free	No artificial fragrance, soy-free, gluten-free, and dairy-free
Model Number	M225-R
Number of Items	1
Primary Supplement Type	Selenium
Product Benefits	Liver & Detox Thyroid
Product Dimensions	4.32 x 4.32 x 7.54 cm; 18 g
UPC	693749225010
Unit Count	60.00 粒

Reviews

D**D

My doctor suggested I add selenium to my supplement regime for my thyroid issue. I love these They are very small and easy to swallow and do not have any after taste as some of the other brands I have tried. I have repurchase a few times. They seem to work for me as my numbers are within normal range again.

24.03.2026

A**R

Good quality

5.01.2026

C**N

Entregado en plazo

5.09.2025

A**Z

I really trust this company

3.03.2026

C**N

Good quality

2.10.2025

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