Fully Active B Complex, 60 Veg Caps
by Doctor's Best
Compare Prices
Doctor's Best Fully Active B Complex earns its name by using genuine active forms throughout: Quatrefolic® 5-MTHF for folate, methylcobalamin at 1000mcg for B12, and riboflavin 5'-phosphate alongside standard riboflavin. Best for People with MTHFR gene variants who cannot convert folic acid and need pre-formed 5-MTHF and Those with diagnosed or suspected B12 deficiency, including diabetics on metformin who deplete B12.
According to the AIScored 0–100 scoring system, Fully Active B Complex, 60 Veg Caps by Doctor's Best scores 79.0/100, ranking #7 out of 31 products in B Vitamins (2026). Strongest category: Ingredient Quality (85.0/100). Weakest: Certifications (37.0/100).
Is Fully Active B Complex, 60 Veg Caps worth buying?
“Doctor's Best Fully Active B Complex scores 80/100, using bioavailable active forms like Quatrefolic and methylcobalamin so your body can actually absorb what it needs. Users regularly report better energy and less fatigue, plus you won't get the niacin flush that comes with standard B-complex supplements.”
What Do Reviewers Say About Fully Active B Complex, 60 Veg Caps?
Sample excerpts from currently available source material used in this product analysis.
"The very best. I'm taking Doctor's Best B-complex vitamins—and I can really feel the difference! I have more energy, less fatigue and irritability, I sleep more restfully, and I wake up refreshed. My nervous system seems to have strengthene..."
"Distinguished. One of the best B-complex supplements, relatively cheap... but always good... the quality is excellent, the size is suitable, the effectiveness is excellent, the quantity is good, the taste is delicious, it is easy to use, I..."
"Energy and support for the nervous system. Doctor's Best B Complex with Quatrefolic is a great formula to support energy, metabolism, and nervous system health. The capsules are easy to digest, the composition is active and pure, without un..."
"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."
"Super!. Using a B vitamin complex ensures the health and well-being of the body. It improves cell metabolism, brain function and overall energy of the body. I recommend it."
How does Fully Active B Complex, 60 Veg Caps score?
Detailed score breakdown and key findings from our analysis of 49 reviews across 1 source.
Pros
- +Active B vitamin forms throughout — Quatrefolic® folate, methylcobalamin B12, riboflavin 5'-phosphate — not cheaper synthetic alternatives
- +Reviewers consistently report reduced fatigue and better energy, often noticing effects within a few days
- +1000mcg methylcobalamin per capsule is a solid B12 dose at a price most reviewers call good value for a 2-month supply
- +Niacin delivered as niacinamide — no flush reported, and capsule size described as easy to swallow with no aftertaste
- +Improved focus and mood mentioned by multiple reviewers, with one reporting resolution of recurring morning headaches after sustained use
Cons
- -Bright yellow urine and occasional smell from sweat noted by several users — harmless but worth knowing before starting
- -Some users report burping or mild digestive discomfort after taking, particularly on an empty stomach
- -No third-party testing — the active form claims rely on brand transparency, not independent verification
- -One reviewer questions whether all forms are truly active, suggesting some inactive B vitamin forms may be included alongside the premium ones
Best For
Watch Out
- !Bright yellow urine is expected at these B2 doses — not a sign of harm, but alarming if unexpected
- !Take with food: several users who experienced burping or gastric discomfort likely took it fasted
- !The product label warns specifically about sensitivity to thiamine, niacin, and B12 — consult a doctor if any of those apply to you
- !No independent lab verification of label claims or contaminant testing
What is Fully Active B Complex, 60 Veg Caps?
Fully Active B Complex, 60 Veg Caps is a b vitamins product by Doctor's Best, scoring 79.0/100 on AIScored.
- • Product overview Description 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 Suggested use Adult use:Take 1 capsule daily with food, or as recommended by a nutritionally-informed physician.
- • Other ingredients Hypromellose (vegetarian capsule), microcrystalline cellulose, magnesium stearate (vegetable source), silicon dioxide.
- • Warnings Do not exceed the recommended dose.
- • Consult a physician if hypersensitive to thiamine, niacin, and vitamin B12.
- • Discontinue use and consult a physician if adverse reaction occurs.
- • Keep out of reach of children.
- • Store in a cool dry place.
- • Disclaimer While iHerb strives to ensure the accuracy of its product images and information, some manufacturing changes to packaging and/or ingredients may be pending update on our site.
- • Although items may occasionally be despatched with alternative packaging, freshness is always guaranteed.
- • We recommend that you read labels, warnings and directions of all products before use and do not rely solely on the information provided by iHerb.
- • This website has been machine translated as a courtesy to customers.
- • iHerb does not represent or warrant that the translations are complete or error-free and iHerb is not responsible for any translation errors or omissions.
- • Supplement information Serving size:1 Veggie Capsule Servings Per Container: 60 Amount per serving %Reference intake Vitamin C (as ascorbic acid) 40 mg 44% Thiamine (as Thiamine HCl) 60 mg 5000% Riboflavin (as riboflavin and riboflavin 5'-phospate) 75 mg 5,769% Niacin (as niacinamide.
Is Fully Active B Complex, 60 Veg Caps Independently Tested?
No Third-Party Testing Visible
We could not find evidence of independent third-party testing for this product. This doesn't mean it's unsafe, but independent verification provides additional assurance.
How We Score Supplements
Our methodology analyses review data, ingredient science, and product information, then scores each product on a 0-100 scale across evidence-based categories:
Effectiveness
How well the product delivers its claimed benefits, based on reviews and ingredient evidence.
Ingredient Quality
Bioavailable forms, clinically effective dosages, clean label, minimal fillers.
Value for Money
Price relative to ingredient quality, dosage count, and effectiveness.
Side Effects Profile
Higher score = fewer side effects. 100 means virtually no adverse reactions reported.
Certifications & Testing
Third-party lab testing, GMP certification, and independent quality verification.
Overall Score
Weighted combination of all factors. Our bottom-line recommendation.
How Does Fully Active B Complex, 60 Veg Caps Compare?
See how this product stacks up against the top-rated b vitamins in our database.
| Product | Score | Price |
|---|---|---|
| Fully Active B Complex, 60 Veg Caps (this) | 79.0 | £16.07 |
| Active Folic 60 Capsules | 80.0 | £12.99 |
Price History (90 days)
Quick Facts
- Vegan
- No
Frequently Asked Questions
Is Fully Active B Complex, 60 Veg Caps worth buying in 2026? ▼
What is the best price for Fully Active B Complex, 60 Veg Caps in the UK? ▼
What are the pros and cons of Fully Active B Complex, 60 Veg Caps? ▼
Is Fully Active B Complex, 60 Veg Caps third-party tested? ▼
How does Fully Active B Complex, 60 Veg Caps compare to Active Folic 60 Capsules? ▼
Disclaimer: AIScored provides research-backed summaries based on publicly available reviews and product information. This is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Affiliate links may earn us a commission at no extra cost to you.
What Are Other Top B Vitamins?
Other top-rated b vitamins you might want to compare.
Feedback & Suggestions
Spotted an issue? Wrong price, incorrect data, or something else off? Let us know and we'll fix it.
Missing a product you'd like us to review? Tell us the product name and we'll consider adding it.