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Doctor's Best

Fully Active B Complex, 60 Veggie Caps

4.7 · 23609 reviews
1,911 ₽

Science-Based Nutrition™ Energy & Cellular Supplement Quatrefolic® Dietary Supplement Non-GMO Gluten Free Soy Free Vegan At Doctor's Best, we value the science of energy. Our Fully Active B Complex is a comprehensive blend of B vitamins that are readily available and highly bioavailable in the body. This unique formula offers optimal support for energy production, cellular health, and overall well-being. Contains Quatrefolic®, a bioactive & highly absorbable folate Supports energy production Supports cellular metabolism

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Science-Based Nutrition™ Energy & Cellular Supplement Quatrefolic® Dietary Supplement Non-GMO Gluten Free Soy Free Vegan At Doctor's Best, we value the science of energy. Our Fully Active B Complex is a comprehensive blend of B vitamins that are readily available and highly bioavailable in the body. This unique formula offers optimal support for energy production, cellular health, and overall well-being. Contains Quatrefolic®, a bioactive & highly absorbable folate Supports energy production Supports cellular metabolism

Customer reviews

5.0
verified purchase
Excellent B complex!

This B complex is really good, this was my N times repurchased. A must have supplement, it improve my energy and mood. But Wonder if anyone else facing the same issue. The weather in SG accelerates the oxidation of health supplement, which is really troubling. Well, my home doesn't get direct sunlight and is well-ventilated. Really hope can solve this problem.

9/19/2024
5.0
verified purchase
All Day Energy

You want to get energised without taking coffee or energy drinks? This is for you. This is super amazing, and you only need 1 capsule daily. Love taking it! Right amount of each vitamins. Worth every penny.

10/31/2025
5.0
verified purchase
good product

I've been using this B complex for about two months now and I'm genuinely impressed with the quality. What sets it apart is the use of bioavailable, active forms — methylcobalamin instead of cyanocobalamin, methylfolate (Quatrefolic®) instead of folic acid, and riboflavin-5-phosphate instead of plain riboflavin. This matters a lot, especially for people who have MTHFR gene variants and can't properly convert synthetic folate.

4/12/2026
5.0
verified purchase
Excellent product

I am already starting to see the effects this is a really good b complex vitamins I am so impressed I will definitely order again when I run out of it the package is very clean the potency is high and it helps my nervous system and metabolism I am already seeing effect and the taste is mild

4/11/2026
5.0
verified purchase
Perfect energy boost and metabolic support!

This B-Complex is exactly what I needed to keep my energy levels stable throughout the day. I’ve noticed a significant improvement in my focus and reduced fatigue, especially during my afternoon workouts. The balance of B vitamins is perfect for supporting the nervous system and metabolism. The capsules are easy to swallow and the quality of the ingredients is evident. It's a great addition to my daily stack, and I love that it provides a natural boost without any jitters. High-quality product at a very reasonable price. Highly recommended!

4/8/2026
5.0
verified purchase

Always enjoyed quality of Docto'rs Best supps. This one improves energy metabolism, helping with my apetite, but also providing relaxing effects to my nervous system. I also drink it ocasionally, not on a regular basis (e.g.: not every day, but once in a while for 2-3 days straight when needed).

4/7/2026
5.0
verified purchase
Great!

I've heard this brand generally use good ingredients, so I bought it. I like the size, and I think it helps focus on my work. As a 30 year old woman, I usually feel sleepy after lunch, and I highly rely on having coffee, but I feel less tired after taking this. I would definitely buy it again! I hope they have bulk size for this product.

2/23/2026
5.0
verified purchase
B-Complex For Gym

Doctors best is a great company once again with a solid product, this will give you energy and help with mood. I take it pre workout sometimes and it helps with energy. There is no niacin flush and the size of the pills are not large. Great packaging by doctors best again.

1/8/2026
5.0
verified purchase
ممتاز!

The product have a great packaging and have a good use and a decent amount

12/5/2025
4.0
verified purchase

Quality: High-quality, bioactive B-complex designed for energy and cellular support. Size: Easy-to-swallow standard-size capsules. Dosage: Once daily. Benefit: Supports energy production, metabolism, and overall cellular health. Package: Easy-open bottle with secure packaging. Taste: No smell or taste. Other Aspects: I tend to be low on energy and needed a dependable boost. I had run out of my previous B-complex and decided to try Doctor’s Best. The dosage is convenient, and the price is reasonable for the amount you get. I would definitely repurchase because it performs well and is easy to incorporate into my daily routine.

12/4/2025