Page 1 - Reviews - 21st Century, B-1, 110 Tablets - iHerb
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B-1, 110 Tablets
B-1, 110 Tablets

Customer Ratings & Reviews

100% authenticOur products are sourced directly from brands or authorized distributors.Show more
4.8
Based on 640 ratings
537
72
20
6
5
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What customers say
Customers are generally very satisfied with the 21st Century B1 supplement, praising its high quality, affordability, and effectiveness. Many users report increased energy levels and improved focus. The product is noted for its good ingredient profile and value for money. Some customers appreciate the flexibility in dosage due to the tablet size, although a few wish the tablets were smaller. The neutral taste and packaging are also positively mentioned. Fast shipping and a user-friendly purchasing experience from iHerb are additional highlights. However, one customer noted a strong smell they did not like.
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Rating

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English
Translated reviews
iHerbCustomer
Posted on Feb 8, 2025
Thailand
16
0
0
4
Very good B1 supplement
Verified purchase
First, everything arrived in very good condition. I take a B1 supplement for a very specific reason and have found that most don't work for me. 21st Century B1 is the exception. It works very good for me, which means that it is being fully absorbed into my system. I am very happy to have found it.
iHerb customer
Posted on Sep 1, 2025
Thailand
36
0
1
1
Good value
Verified purchase
This is a "no frills" basic B1 tablet that does the job fine. Good value and recommended
iHerb customer
Silver
Posted on Mar 21, 2026
Nigeria
156
36
0
9
good one
Verified purchase
I’m really impressed with the quality of this supplement. The ingredients are clean and well-selected, which makes me feel confident about what I’m putting into my body. The potency is noticeable, and I started seeing good results after consistent use. The taste is also quite pleasant, making it easy to take daily without discomfort
2521d024-651d-40c3-b61c-60934ca15853
march071979
Posted on Mar 10, 2026
Philippines
40
0
0
0
Verified purchase
the quality is good. it gives energy and good for the nervous system
iHerb customer
Posted on Oct 16, 2024
Israel
35
37
0
13
excellent
Verified purchase
B-1 (Thiamine): These B-1 capsules have been really helpful in supporting my energy levels and metabolism. I’ve noticed that I feel more alert and less fatigued throughout the day. It’s an easy supplement to take and has made a noticeable difference in my overall energy and focus. I’m very happy with the results! quality
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iHerb customer
Posted on Nov 12, 2025
France
24
0
0
37
Excellent
Verified purchase
Quality product and affordable. The dosage is 1 a day. I take vitamin B1 because it keeps the nervous system healhy, it raises my energy levels, it is good for the brain and it strengthens my immune system. It is easy to swallow
iHerb customer
Silver
Posted on Nov 4, 2025
Morocco
294
28
1
25
Great quality and noticeable results!
Verified purchase
I’ve been taking this B1 supplement for a few weeks and I really feel the difference — more energy, better focus, and no stomach discomfort. The tablets are easy to swallow, great quality as always from 21st Century. Highly recommend it!
iHerb customer
Gold
Posted on Aug 8, 2025
Philippines
2,171
0
0
44
Verified purchase
Thank you for providing such outstanding supplements! The quality is exceptional, with thoughtfully selected ingredients that offer remarkable health benefits. Your products have made a significant positive impact on my overall well-being. I also appreciate the secure and reliable packaging. Thanks again, iHerb!
iHerb customer
Silver
Posted on Feb 8, 2026
Japan
245
9
24
150
Great source of Vitamin B1 (Thiamine)
Verified purchase
I’ve been taking this B-1 supplement daily and genuinely feel the difference in my energy levels. It’s easy on the stomach and doesn’t cause any discomfort, unlike some other B vitamins I’ve tried. After a few weeks I noticed better focus and overall vitality throughout the day. Great quality product and excellent value. Highly recommend for anyone looking to support their energy metabolism and feel more vibrant day-to-day.
Casaletto
Posted on Jan 23, 2026
Estonia
34
0
2
1
Nice choice!
Verified purchase
I have been using it for a few weeks and am pleased with the overall quality of the product. The main ingredient is clearly listed, and I appreciate the simple composition with no unnecessary additives. The capsule is manageable and easy to swallow, and it has no noticeable taste, making it convenient to take daily. Overall, I’m happy with the quality and composition of this supplement and the package, and it’s a great addition to my routine to boost potency and balance the nervous system.