Page 1 - Reviews - 21st Century, Selenium, 200 mcg, 60 Capsules - iHerb
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Customer Ratings & Reviews

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4.8
Based on 11,064 ratings
9,291
1,151
449
109
64
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What customers say
Customers highly praise this selenium supplement for its effectiveness in improving overall health, mood, energy levels, and immune support. Many users report noticeable improvements in well-being and specific conditions like hypothyroidism and Hashimoto's. The product is appreciated for its high quality, reasonable price, easy-to-swallow packaging, and fast shipping. Users find it beneficial for maintaining good health without side effects and recommend it for its excellent value.
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English
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iHerbCustomer
Gold
Posted on Aug 1, 2025
Philippines
1,732
0
0
82
Verified purchase
This Product is really nice because of the quality of it and the good benefit for our body.!! Good Job Iherb. fAST shipment. Door to door. Job well done. I need it right away. The quality of the ingredients is good! i like it because its all natural and not having stomach ache. Thank you iHerb :)
iHerbCustomer
Posted on Feb 6, 2026
France
61
6
2
13
Прекрасно!
Verified purchase
Quality is super! The ingredients are great! Size arranged! What you need! Performance is felt! the product arranged, perfectly packed, the effect is definitely there! I will order more! Just as quickly delivered
MoPo
Posted on Dec 1, 2024
Italy
46
0
0
12
Good value
Verified purchase
I’ve been using 21st Century Selenium, and I'm impressed with its effectiveness. The supplement has significantly improved my overall health, mood, energy levels, and immune support. The capsules are easy to swallow, and the quality ingredients ensure you get the maximum benefit. The packaging is robust, keeping the capsules fresh, and the price is very reasonable. I've noticed better energy, healthier hair, and enhanced clarity since starting this supplement. Despite a few mentions of the selenium form having lower absorption, the benefits are clear, making it a great value for money.
Ulviyyasevdanurcan
Gold
Posted on Oct 23, 2025
United States
403
19
4
9
Good
Verified purchase
Will buy again this product size is good quality is good
AhmedAyad
Posted on Oct 21, 2025
United Arab Emirates
64
0
2
1
BEST QUALITY
Verified purchase
The product quality is consistently outstanding, exceeding my expectations every time
iHerbCustomer
Silver
Posted on Apr 8, 2026
Spain
244
0
0
7
Verified purchase
High-quality selenium supplement! The 200 mcg capsules are easy to take and provide excellent support for immunity and overall wellness. I’ve noticed better energy and well-being since using them consistently. Reliable, effective, and great value—highly recommend
iHerbCustomer
Posted on Feb 16, 2024
United States
87
0
4
25
good quality
Verified purchase
The size of the tablets are small, making it easier to swallow. Selenium is a mineral found in soil, water and some foods. It is for metabolism and has antioxidant properties. It supports Thyroid functions, although too much is harmful. It also helps to fight cell damage that could worsen brain and nervous system diseases, such as Alzheimer's, Parkinson's and MS. It has been noted to help with arthritis . Most people are not deficient in Selenium, and the dosage for adults should be no more that 55 mcg.
iHerb customer
Posted on Nov 10, 2025
United States
59
0
0
6
Verified purchase
The 21st Century product "Selenium & ACE Mega Potency Antioxidants" is best for protecting the body from free radicals and slowing the aging process by combining selenium with vitamins A, C, and E. As a supplement, selenium is also best for supporting thyroid function, immune response, and antioxidant defense, along with playing roles in male fertility and cardiovascular health.
iHerb customer
Gold
Posted on Aug 12, 2025
Kuwait
324
0
0
3
Great
Verified purchase
Quality is good Ingredient is good Age are you sure that is not Calcium and calcium in your body or are Package and you don’t want that for Benefits or your blood or blood Bone and I want it Improvement is not an answer but supplement and a little of Combination I don’t want you guys being Deficiency in a bad situation but Taste it it was the right choice to do
Premium
Posted on Dec 5, 2023
Korea, Republic of
72
78
0
70
좋음
Verified purchase
Buy it with your own money and use it long-term. I will honestly write down a few personal subjective feelings. This capsule is a bit big Sometimes it gets stuck in my throat Especially because the coating is a drug, sometimes If you don't swallow it quickly No significant digestive problems after ingestion No foul odor yet No major physical changes However, it does help a little with vitality. bottle packaging format Protected against moisture oxygen oxidation I hope the packaging changes Willing to repurchase This review of mine may help you at least a little bit. hope this helps 👍To everyone who clicked recommend I hope you and your family stay healthy 🙏