THORNE Stress B-Complex - Active B Vitamins with Extra B5 for Adrenal Support - 60 Capsules

Key Ingredients & Their Active Forms

Thorne uses only the most research-backed forms of each B vitamin. This formula stands out because every nutrient is in a bioavailable state, ready for your body to use immediately. Here’s what you’ll find inside each capsule:

• Vitamin B1 (Thiamine) – as thiamine HCl, a well-absorbed form.
• Vitamin B2 (Riboflavin) – as riboflavin 5’-phosphate, the active coenzyme.
• Vitamin B3 (Niacin) – as niacinamide, a flush-free form that supports skin and nerve health.
• Vitamin B5 (Pantothenic Acid) – an extra 250 mg as calcium pantothenate, specifically chosen for adrenal support.
• Vitamin B6 – as pyridoxal 5’-phosphate (P-5-P), the active form that bypasses hepatic conversion.
• Vitamin B7 (Biotin) – as d-biotin for metabolism of fats and amino acids.
• Vitamin B9 (Folate) – as L-5-methyltetrahydrofolate (L-5-MTHF), the active form that crosses the blood-brain barrier and is usable even with MTHFR mutations.
• Vitamin B12 – as methylcobalamin, the active coenzyme form for nerve and energy support.
• Choline – as choline bitartrate, supporting neurotransmitter production and cell membrane integrity.

All ingredients are encapsulated in a base of microcrystalline cellulose and hypromellose (vegetable capsule) for purity and optimal absorption.

Benefits of Thorne Stress B-Complex

B vitamins are fundamental to converting food into usable energy. Thorne Stress B-Complex amplifies this process by providing an optimal ratio of each vitamin, plus extra B5 to help modulate cortisol and maintain adrenal resilience during stressful periods.*

• Energy Metabolism: B vitamins act as coenzymes in mitochondrial energy production. This helps combat stress-related fatigue and keeps your cellular engines running smoothly.
• Nervous System Support: Active B6 (pyridoxal-5-phosphate) and B12 (methylcobalamin) support normal neurotransmitter synthesis, which can contribute to a stable mood and mental clarity.
• Adrenal & Stress Response: Extra pantothenic acid (B5) is specifically included to support the adrenal glands, which are central to how your body handles stress.
• Immune Function: B vitamins like B6 and folate play roles in immune cell activity, helping maintain a healthy defence system.

These benefits work together to help you feel balanced and energised, even during demanding times.*

What Is Thorne Stress B-Complex?

Thorne Stress B-Complex is a premium supplement designed to support your body’s natural stress response. It delivers all eight essential B vitamins in their most bioavailable forms – including methylfolate and methylcobalamin – along with extra vitamin B5 (pantothenic acid) to nurture adrenal function. Each capsule also contains choline, a nutrient that works synergistically with B vitamins to promote brain health and a balanced mood.

Unlike many B-complex supplements that rely on cheaper synthetic forms, Thorne prioritises active, tissue-ready ingredients. This means your body can use them straight away without needing to convert them first – a key advantage for individuals with genetic variations like MTHFR. The result is a formula that efficiently supports energy production, stress management, and overall vitality.*

How to Choose the Right B-Complex

Not all B-complex supplements are created equal. When selecting a product, consider these factors:

• Active vs. Inactive Forms: Look for methylated folate (L-5-MTHF), methylcobalamin, and P-5-P. These are ready for your body to use, especially if you have genetic variations that hinder conversion.
• Dosage Balance: Thorne provides a balanced profile close to Daily Values, with extra B5 targeted for stress. Check that no single vitamin is excessively high unless you have a specific need.
• Third-Party Testing: Thorne’s products are certified by independent labs for purity and potency, ensuring what’s on the label matches what’s in the capsule.
• Allergen Information: This formula is free from gluten, dairy, soy, and artificial additives. It’s suitable for vegetarians (capsule is vegetable-based).

Thorne is the #1 most recommended clinical brand by healthcare practitioners, trusted by over 100 professional sports teams for its quality and consistency.

How to Take Thorne Stress B-Complex

The suggested use is one capsule daily, preferably with a meal to enhance absorption and minimize potential stomach upset. Taking B vitamins earlier in the day may support energy levels and avoid interference with sleep. If you’re also taking other supplements, Thorne Stress B-Complex pairs well with a high-quality multivitamin or magnesium for additional stress support. Always consult your healthcare provider before starting any new supplement, especially if you are pregnant, nursing, or taking medications.

Side Effects and Interactions

B vitamins are water-soluble, so excess amounts are generally excreted in urine. However, high doses can cause temporary side effects:

• Bright yellow urine – common with B2 (riboflavin) and harmless.
• Nausea or stomach upset – usually mild; taking with food helps.
• Skin flushing – not typical with niacinamide (used here), but possible with niacin forms.

Potential interactions: B6 in high doses may affect certain medications like levodopa; B9 (folate) can mask B12 deficiency in some cases. If you are on prescription drugs, especially for epilepsy or cancer, consult your doctor before use.

Frequently Asked Questions

Is Thorne Stress B-Complex suitable for vegans?

Yes, the capsule is made from hypromellose (vegetable cellulose), and all ingredients are non-animal derived. No gelatine.

Can I take this on an empty stomach?

It’s best taken with food to reduce the risk of mild nausea. The active forms are well-absorbed with or without meals, but food helps buffer the stomach.

How long does it take to notice effects?

Many people report improved energy and mood within a few days to two weeks, but individual responses vary. Consistent daily use is key.

Does this contain caffeine or stimulants?

No. Thorne Stress B-Complex is stimulant-free. Its energy benefits come solely from optimising cellular metabolism.

* This product is not intended to diagnose, treat, , or prevent any disease. Always read the label and follow directions for use.