Thorne Basic B Complex

Your body can't store B vitamins. Every hard run, long ride, or punishing interval session depletes them, and because they're water-soluble, what your body doesn't use gets flushed out daily. Most athletes assume their diet covers the gap. Often, it doesn't. And when your B vitamin levels slip, the first things to go are energy, focus, and the efficiency of the metabolic engine that turns food into fuel.

Thorne Basic B Complex is the daily foundation that keeps all of that running smoothly. This daily formula delivers all eight in their most absorbable active forms, so your body can convert food to fuel efficiently every single day.

All Eight B Vitamins in Active, Tissue-Ready Forms – Most B-complex supplements use cheap, inactive vitamin forms that your body has to convert before they're useful — a step that's inefficient for everyone and genuinely problematic for athletes with certain genetic variations. Basic B Complex delivers every B vitamin in its active form, including methylcobalamin B12 and methylated folate (5-MTHF), so your body can put them to work immediately.

400mcg of Methylcobalamin B12 Per Capsule – B12 supports red blood cell formation, oxygen transport, and nerve signaling, three things that matter enormously when you're training. Thorne's Basic B Complex delivers a meaningful clinical dose in the most bioavailable form available, which is especially important for plant-based athletes whose diets are naturally low in B12.

Choline for Focus and Neurological Function – Alongside the eight core B vitamins, Basic B Complex includes choline, a nutrient that supports the production of acetylcholine, the neurotransmitter responsible for muscle activation and sharp cognitive function. When training volume is high and mental bandwidth is stretched, this matters.

B vitamins work together at every stage of your body's energy production process — converting carbohydrates, fats, and proteins into fuel, supporting red blood cell formation, and keeping your nervous system firing cleanly. Because they don't accumulate in the body, daily replenishment isn't optional. It's maintenance.

How to Use Thorne Basic B Complex

Daily Foundation: Take 1 capsule with breakfast to prime your energy systems for the day ahead. Morning dosing with food maximizes absorption and minimizes any chance of digestive sensitivity.

Higher Training Loads: During heavy training blocks, take up to 3 capsules daily, split across meals, as recommended by your healthcare practitioner.

Pro Tip: Avoid late-day dosing — B vitamins are energizing by nature and can disrupt sleep in sensitive athletes when taken in the evening.