Doctor's Best Fully Active B Complex with Quatrefolic | 60 Veggie Caps

Doctor's Best Fully Active B Complex delivers all eight B vitamins in their most bioavailable, active forms — including Quatrefolic®, the gold standard in folate supplementation, and 1,000mcg of methylcobalamin B12 — supporting energy production, DNA integrity, nervous system health, and cellular metabolism.

Why

Some B complex supplements use cheap, synthetic forms of B vitamins that your body must first convert before it can use them — a process that many people, particularly those with MTHFR gene variants, struggle to do efficiently. Doctor's Best Fully Active B Complex skips the conversion step entirely. Every B vitamin is delivered in its biologically active form, ready for your cells to use immediately. The standout is Quatrefolic® — the most bioavailable form of folate available, providing superior stability and water solubility compared to standard folic acid, and effective even for those with MTHFR variants. B12 is delivered as methylcobalamin — the neurologically preferred, active form. B2 and B6 are also provided in their active coenzyme forms (riboflavin-5-phosphate and pyridoxal-5-phosphate) for maximum uptake. One capsule a day, non-GMO, vegan, gluten free, soy free. Doctor's Best has been formulating science-based supplements since 1990.

Key Benefits

• All 8 B vitamins in fully active, bioavailable forms — no conversion required
• Supports sustained energy production and reduces fatigue at the cellular level
• Supports DNA integrity, cell division, and healthy new cell formation
• Supports nervous system health, mood, and cognitive function
• Quatrefolic® folate — superior bioavailability vs standard folic acid, ideal for MTHFR variants
• Methylcobalamin B12 (1,000mcg) — the active, neurologically preferred form
• Active B2 (riboflavin-5-phosphate) and B6 (pyridoxal-5-phosphate) for enhanced absorption
• Supports skin, hair, nail, and immune health
• Non-GMO, vegan, gluten free, soy free
• 60 veggie capsules — 2-month supply at 1 capsule per day

Formula Highlights

• Vitamin B1 — Thiamin HCl (60mg, 5,000% DV) — supports energy metabolism and nerve function
• Vitamin B2 — Riboflavin & Riboflavin-5-Phosphate (75mg, 5,770% DV) — active form for superior absorption; supports energy and antioxidant function
• Vitamin B3 — Niacinamide & Niacin (50mg, 310% DV) — supports energy production, DNA repair, and skin health
• Vitamin B6 — Pyridoxine HCl & Pyridoxal-5-Phosphate (50mg, 2,940% DV) — active P5P form; supports neurotransmitter synthesis and hormone balance
• Folate — Quatrefolic® (400mcg DFE, 100% DV) — (6S)-5-methyltetrahydrofolic acid glucosamine salt; the most bioavailable folate form
• Vitamin B12 — Methylcobalamin (1,000mcg, 41,670% DV) — neurologically active form; supports nerve health, energy, and red blood cell formation
• Biotin (600mcg, 2,000% DV) — supports fatty acid metabolism, hair, skin, and nail health
• Pantothenic Acid — D-Calcium Pantothenate (100mg, 2,000% DV) — supports adrenal function, hormone synthesis, and energy metabolism
• Vitamin C — Ascorbic Acid (40mg, 45% DV) — antioxidant support and cofactor for B vitamin function

Supplement Facts

Serving size: 1 veggie capsule | Servings per container: 60

**DFE = Dietary Folate Equivalent.

Suggested Use

Take 1 capsule daily with food, or as recommended by your healthcare practitioner.

Other Ingredients

Modified cellulose (vegetarian capsule), microcrystalline cellulose, magnesium stearate (vegetable source), silicon dioxide. Non-GMO, vegan, gluten free, soy free.

About Doctor's Best

Founded in 1990 by a physician, Doctor's Best is committed to science-based nutrition — formulating supplements with clinically studied ingredients at meaningful doses. Every product is manufactured to strict quality standards, with a focus on bioavailability, purity, and efficacy. Fully Active B Complex is a prime example: no shortcuts, no inferior forms — just the most effective B vitamins your body can actually use.

Warnings

Store in a cool, dry place. Keep out of reach of children. Consult a healthcare professional before use if pregnant, nursing, or taking medications.