---
product_id: 4236391
title: "Fully Active Vitamin B Complex Supplement for Men & Women - Super Complex with Methylated B12 & Folate, B6, Biotin, Pantothenic Acid, & More, Energy Support Caps - 30 Veggie Capsules"
brand: "doctor's best"
price: "€ 21.16"
currency: EUR
in_stock: true
reviews_count: 8
category: "Doctor's Best"
url: https://www.desertcart.hr/products/4236391-fully-active-vitamin-b-complex-supplement-for-men-and-women
store_origin: HR
region: Croatia
---

# 1000 mcg active B12 for energy boost Vegan, Non-GMO, Gluten & Soy free purity Quatrefolic methylated folate for max absorption Fully Active Vitamin B Complex Supplement for Men & Women - Super Complex with Methylated B12 & Folate, B6, Biotin, Pantothenic Acid, & More, Energy Support Caps - 30 Veggie Capsules

**Brand:** doctor's best
**Price:** € 21.16
**Availability:** ✅ In Stock

## Summary

> ⚡ Unlock your energy potential with the fully active B complex!

## Quick Answers

- **What is this?** Fully Active Vitamin B Complex Supplement for Men & Women - Super Complex with Methylated B12 & Folate, B6, Biotin, Pantothenic Acid, & More, Energy Support Caps - 30 Veggie Capsules by doctor's best
- **How much does it cost?** € 21.16 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/4236391-fully-active-vitamin-b-complex-supplement-for-men-and-women)

## Best For

- doctor's best enthusiasts

## Why This Product

- Trusted doctor's best brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Brain & Nerve Optimizer:** Vitamin B6 and thiamin support cognitive clarity and nerve health
- • **Clean & Conscious Formula:** Vegan, Non-GMO, gluten & soy free for mindful wellness 🌱
- • **Next-Level Bioavailability:** Quatrefolic folate ensures your body absorbs every drop 🧬
- • **Power-Packed Energy Catalyst:** 1000 mcg fully active B12 fuels your daily vitality ⚡
- • **Comprehensive B Vitamin Spectrum:** All 8 B vitamins in their most active forms for total cellular support

## Overview

Doctor's Best Fully Active B Complex delivers a potent blend of all eight essential B vitamins in their most bioavailable, methylated forms—including 1000 mcg of active B12 and Quatrefolic folate—designed to maximize energy production, support brain and nerve health, and promote overall well-being. This vegan, non-GMO, gluten- and soy-free formula is crafted for professionals seeking clean, effective supplementation that powers metabolism and cognitive function with superior absorption.

## Description

The breakthrough features of this formulation include: supplies only the best-utilized b vitamin forms. Most b vitamin supplements use cheap forms that are not optimally utilized in the body. This formulation does not compromise-it provides generous amounts of the most active b vitamins. Substitutes naturally fully active folate for synthetic folic acid. Folic acid is an artificial folate that is difficult for the body to assimilate. This formulation instead provides the body's most fully active folate, MTHF (methyl-tetra-hydro-folate). Provides sufficient, fully active vitamin B12. Very few supplements provide sufficient amounts of active vitamin B12. This formulation provides 1000 micrograms of fully active B12 to help ensure excellent oral absorption. Thiamin ("vitamin B1") is fundamental to human metabolism because it is essential for the metabolism of oxygen. The microscopic "power plants" of our cells (mitochondria) require thiamin to generate energy, but elsewhere in the cells it is also required for energy generation. Thiamin is important for metabolizing amino acids, the building blocks of proteins, but is especially important for managing sugar and other carbohydrates, and can be depleted by high-carbohydrate diets. Thiamine even helps support the delicate blood vessels of the retina and other tissues in the presence of high levels of circulating blood sugar. This vitamin is absorbed only as thiamin (not as other thiamin vitamins) in the upper small intestine. Alcohol can impair the proteins that transport thiamin, and high alcohol consumption is linked to thiamine deficiency. The brain and other nervous tissues have especially high thiamin requirements. Other organs with high oxygen requirements, such as the heart, also have high demand for thiamine.

Review: Excellent - This is very good. More energy,calmness,overall well being. Also,helping with balance issues due to possible B 12 depletion as a result of long-term Metformin and Prilosec usage. Which is common. Their Magnesium Glycinate is excellent also.
Review: What a Steal!...Great Product!...Contains 100% methyl-Folate/Quatrefolic/5-MthF! - Thrilled to find methylated/co-enzyme/active B-Vitamins at such a great price. Methylated B vits. are fully active, your body does not have to 'convert' these in to a usable form - they are already fully absorbable & ready to get to work in your body - - unlike 'old-fashioned'! non-methylated B's (i.e.: B50 complexes & the like) which actually require your body to 'convert' those to a usable form, this process itself is difficult for the body/liver & more so for certain genetic 'mutants'! - Long story short - methylated/activated/co-enzyme B-Vitamins are far superior (my opinion!) & better absorbed than the kind of B-complexes you might find at your local drug-store or Gas Station .... I used to use Jarrow 'B-right' but they changed the formula to contain a mix of synthetic/fake Folic acid & 5-mthf, whereas the Doctors Best brand contains 100% Quatrefolic (5mthf) - so Doctors Best is my preferred choice now! .... I get a definite boost in energy & mental clarity .... I take these every day along side my Amino Acids - the B's ensure that the Aminos can do their job And of course a healthy daily intake of B's is essential for practically every process in the body & to help the Liver keep on humming-along! Two big thumbs up for Doctors Best fully Active B-complex! The product got here (Hawaii) very quickly - 2 days faster than anticipated arrival! desertcart outdoes itself yet again!

## Features

- FULLY ACTIVE B COMPLEX - 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.*
- METHYLATED B12 FORM – Quatrefolic folate supplement included, proved high bioavailability, solubility, and long-lasting stability. This blend combines all eight vitamins, including vitamin B1, B3 niacin, riboflavin, vit B6, and biotin vitamins.*
- IMPORTANCE OF VITAMIN B - plays a vital role in energy production, maintaining healthy brain function, supporting circulation, boosting immunity, and promoting positive mood, making them essential for optimal well-being.*
- ENERGY SUPPORT - B vitamins are crucial for energy production and metabolism, helping the body convert food into usable energy by supporting the metabolism of carbohydrates, fats, and proteins.*
- NERVE HEALTH - Vitamin B6 (pyridoxine) is vital for a healthy nervous system, playing a crucial role in early brain development and the metabolism of neurotransmitters, which are chemical messengers that transmit signals between nerve cells.*

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00DWDZPBG |
| Age Range Description | Adult |
| Allergen Information | Gluten Free, Soy Free |
| Best Sellers Rank | #23,085 in Health & Household ( See Top 100 in Health & Household ) #67 in Vitamin B-Complex Supplements #1,903 in Sales & Deals |
| Brand | Doctor's BEST |
| Brand Name | Doctor's BEST |
| Color | No Color |
| Customer Reviews | 4.6 out of 5 stars 2,747 Reviews |
| Diet Type | Vegan |
| Dosage Form | Capsule |
| Flavor | Unflavored |
| Global Trade Identification Number | 00753950002999 |
| Item Dimensions | 2.13 x 2.13 x 3.75 inches |
| Item Form | Capsule |
| Item Nype Name | Fully Active B Complex |
| Item Weight | 0.04 Kilograms |
| Manufacturer | Doctor’s Best, Inc |
| Model Name | Doctor ' S Best Fully Active Nongmo Gluten Free Vegan Count |
| Number of Items | 1 |
| Primary Supplement Type | B-Complex |
| Product Benefits | Metabolism Improvement |
| Specific Uses For Product | Immune Support, Skin |
| UPC | 753950002999 |
| Unit Count | 30 Count |

## Product Details

- **Brand:** Doctor's BEST
- **Diet Type:** Vegan
- **Flavor:** Unflavored
- **Item Form:** Capsule
- **Primary Supplement Type:** B-Complex

## Images

![Fully Active Vitamin B Complex Supplement for Men & Women - Super Complex with Methylated B12 & Folate, B6, Biotin, Pantothenic Acid, & More, Energy Support Caps - 30 Veggie Capsules - Image 1](https://m.media-amazon.com/images/I/61+Zpf3mO1L.jpg)

## Available Options

This product comes in different **Size, Flavor** options.

## Questions & Answers

**Q: Is this made in usa? whether any ingredients are sourced from china?**
A: Personally, I find it bizarre that this question is asked so often. No matter where the product is made or source, do you actually think that the end product would not have to meet purity standards in order to be sold here in the US?  I googled the Kingdomway Group for further information, and it turns out they've been in business since 1998, selling vitamin A, D, DHA, Co-q-10, etc.. And NEWSFLASH: Probably 90% of all supplement companies get their raw materials from China, just like 90% of everything we buy in the US has some components made overseas.  Sheesh...

**Q: Can anyone tell me how large the capsules are? I am looking for a supplement for my daughter and she has some trouble swallowing large pills.**
A: Capsules have a rating system like 0,1,2 like small medium and large. This capsule is clear, unmarked and is 3/4 inch in length. It is not a creepy hard tablet that sticks to your throat.  I don't think that is considered the large - more medium.  It goes down well. For a child though might consider a chewable or liquid, although B's aren't that tasty to me.  The important thing is to get the Quatrefolic, the Cadillac of the folates. Drs Best has great B's.

**Q: Is this comparable to nutritional yeast?**
A: Better than nutritional yeast, I think. Both are bioactive. Like natural yeast, this complex has the active forms of Bs, so they can be utilized by people who cannot metabolize folic acid and other non-active b vitamins. About 45% of the population have what is called an MTHFR gene mutation, for instance, that doesn't allow them to metabolize the synthetic form of folate, folic acid.  As such, they lose out then on one pathway to healthy methylation - and production of neurotransmitters, hormones, immune and digestion enzymes and more.

But this is a much higher dosage than you can get in nutritional yeast without eating cupsful of it.  It's okay if the amounts of b vitamins, which are water-soluable, are high, as your body just burns off what you don't need.  But if you are deficient in a particular b vitamin(s), your body may need these higher amounts.  Nutritional yeast also needs to be supplemented with a active from of b12, such as methycobalamin, because it doesn't contain B12.

Nutritional yeast would be great for someone who knows they have good b-vitamin values already and are just looking to maintain.  But taking a daily active B12 supplement with the yeast would be generally be recommended.

**Q: Why is Dr. Best fully active B complex so inexpensive? And what is the purpose of absorbing acid  ( a synthetic vitamin c ) included in the formula?**
A: Well you're only getting 30 pills.  But also, this is a good brand IMO.  They're not trying to gouge the customer.  Not sure about your formulation question.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Excellent
*by F***S on October 25, 2025*

This is very good. More energy,calmness,overall well being. Also,helping with balance issues due to possible B 12 depletion as a result of long-term Metformin and Prilosec usage. Which is common. Their Magnesium Glycinate is excellent also.

### ⭐⭐⭐⭐⭐ What a Steal!...Great Product!...Contains 100% methyl-Folate/Quatrefolic/5-MthF!
*by B***R on March 19, 2016*

Thrilled to find methylated/co-enzyme/active B-Vitamins at such a great price. Methylated B vits. are fully active, your body does not have to 'convert' these in to a usable form - they are already fully absorbable & ready to get to work in your body - - unlike 'old-fashioned'! non-methylated B's (i.e.: B50 complexes & the like) which actually require your body to 'convert' those to a usable form, this process itself is difficult for the body/liver & more so for certain genetic 'mutants'! - Long story short - methylated/activated/co-enzyme B-Vitamins are far superior (my opinion!) & better absorbed than the kind of B-complexes you might find at your local drug-store or Gas Station .... I used to use Jarrow 'B-right' but they changed the formula to contain a mix of synthetic/fake Folic acid & 5-mthf, whereas the Doctors Best brand contains 100% Quatrefolic (5mthf) - so Doctors Best is my preferred choice now! .... I get a definite boost in energy & mental clarity .... I take these every day along side my Amino Acids - the B's ensure that the Aminos can do their job And of course a healthy daily intake of B's is essential for practically every process in the body & to help the Liver keep on humming-along! Two big thumbs up for Doctors Best fully Active B-complex! The product got here (Hawaii) very quickly - 2 days faster than anticipated arrival! Amazon outdoes itself yet again!

### ⭐⭐⭐⭐⭐ Excellent product
*by A***R on March 25, 2024*

I started taking this for product approximately 3 months ago to aide in weight loss and noticed my hair got thicker and healthier. I mentioned it to my daughter who has a lot of holistic knowledge and she asked me if I was taking Biotin. I said no, but recently looked at the ingredients and this B complex has Biotin in it. What a wonderful surprise. I've also lost 10lbs and feel great.

## Frequently Bought Together

- Doctors Best Fully Active B Complex, Energy & Cellular Support, Non-GMO, Gluten Free, Soy Free, Vegan 30 Veggie Caps
- Doctors BEST High Absorption Magnesium Lysinate Glycinate 100% Chelated, Muscle Relaxation & Sleep Support, Non-GMO, Gluten Free, Soy Free, Vegan, 100% Chelated 240 Tablets
- Doctor's Best Vitamin C with Q-C - Vitamin C 1000mg Non-GMO, Vegan, Gluten Free, Soy Free, Sourced from Scotland Veggie Caps, 120 Count

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-02-27*