Page 1 - Reviews - 21st Century, B-100 Complex, Prolonged Release, 60 Tablets - iHerb
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Customer Ratings & Reviews

100% authenticOur products are sourced directly from brands or authorised distributors.Show more
4.7
Based on 4,971 ratings
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What customers say
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English (UK)
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English (UK)
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iHerb Customer
Posted on Aug 16, 2025
United States
44
0
0
1
great for energy
Verified Purchase
with work lately i was feeling ow energy and fatigue the doctor recommend for me B complex and i bought this one , it was a game changer for me , highly recommended, best time to take it in the morning
Auto-translated from English
iHerb Customer
Gold
Posted on Jul 27, 2025
United States
358
0
0
59
B 100
Verified Purchase
I used to use 21 Century B50, and was recommended using the B-100 to help with dysautonomia symptoms and nervous system. Can't beat the price
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SandBlaster
Posted on Aug 18, 2025
Korea, Republic of
39
56
0
28
Good for recovering from fatigue
Verified Purchase
I was taking the 50mg version, but it was sold out, so I ordered the 100mg version. Since it's twice the strength, will it be twice as effective? It's a bit large. Taking one vitamin B complex pill a day helps relieve fatigue and makes me feel more energetic.
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iHerbCustomer
Posted on Nov 26, 2025
Ukraine
21
9
0
3
Verified Purchase
Very good complex of B vitamins. Significantly increases energy and concentration. I liked the slow release - no sharp peaks and drops. The tablet is swallowed normally. The effect is mild, without side effects.
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Yuliya
Posted on Oct 13, 2025
United States
36
0
0
0
Fine
Verified Purchase
I'm an athlete, so I chose these vitamins for the quality of the ingredients, the package size, and the presence of folic acid. The results were excellent.
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iHerbCustomer
Gold
Posted on Jun 15, 2026
Kuwait
847
1
13
24
Verified Purchase
Energy Boost Vitamin Supplement, Gluten-Free, GMO-Free, Lab Tested - Quality Guaranteed, Trusted Quality for Over 30 Years. The B vitamins are interdependent and their functions overlap; they help convert food into energy and maintain the health of the nervous system and body tissues. Extended-release vitamins release nutrients slowly into the body over a prolonged period.
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yuyu
Posted on May 21, 2026
Japan
51
0
0
1
I found out through genetic testing that I was deficient.
Verified Purchase
I had a genetic test and found out I was deficient in vitamin B, so I started taking it. I feel like I'm experiencing less dizziness!
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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
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iHerbCustomer
Silver
Posted on Dec 4, 2025
Japan
254
0
0
86
Verified Purchase
I love sweet things, so vitamin B1 is a must-have. This is cheap and helpful!
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iHerbCustomer
Silver
Posted on Jul 30, 2025
Armenia
285
0
0
2
Verified Purchase
I like this product. I will buy more. Energy increases. Quality
Auto-translated from Russian