Doctor's Best CalmZ with Zembrin is a stress relief and cognitive support supplement that helps you stay calm and focused thanks to Zembrin, a patented plant extract. Zembrin is a patented plant extract noted for calming effects and better focus. Zembrin is produced under seed to shelf quality control with ethical cultivation and strict GMP standards. Doctor's Best has a long standing commitment to good manufacturing practice and vegan, non-GMO standards.

Available Sizes & Variants:

60 Veggie Capsules - Convenient daily dosing in plant based capsules

Benefits & Features:

• Calms stress and supports clear thinking during busy days, helping you stay productive.
• Star ingredient Zembrin delivers calming focus and steadier nerves.
• Clinical grade manufacturing ensures consistent quality across batches, with vegan, non-GMO standards.
• Designed for quick assessment of mood and cognitive clarity throughout demanding days.
• Offers rapid stress relief and mood improvement within hours, helping you stay balanced without drowsiness.

CalmZ centres on Zembrin, a patented extract from Sceletium tortuosum, sitting at the heart of the formula. It’s produced under seed to shelf quality control in South Africa, with each batch traceable to its source plant and verified for quality. The supplier emphasises ethical cultivation and no wild harvesting, backed by an endorsement from the South African San Council. Doctor’s Best partners with good manufacturing practice facilities to keep vegan, non-GMO standards, giving you a transparent, reliable supply you can trust.

United Kingdom Shipping:

Orders placed by 2pm (Monday to Friday) are dispatched the same day. Orders placed after 2pm will be dispatched the next working day.

Free shipping on orders over £50 to the UK.

Returns: Our products are meant to make you feel healthy and at your best. If you need to return your item, you can do so free of charge within 30 days in the same original and unopened packaging. Subject to T&C's.

Please consult the product packaging for accurate instructions on how to use the product.

The Active Ingredient Is: Sceletium tortuosum extract (Zembrin)

Sceletium tortuosum extract, commonly marketed as Zembrin, is a plant-derived supplement ingredient used for calming effects and cognitive support.

This form is a patented, standardised extract produced under seed-to-shelf quality control, with vegan, non-GMO and gluten-free production. It is the sole active ingredient per capsule.

What Does Sceletium tortuosum extract Do?

The extract supports normal stress responses and helps maintain focus and mental clarity in daily life. It is recognised for calming effects and is studied for its potential to aid cognitive function and alertness throughout the day.

Aligned with UK and EFSA-style guidance, this extract supports normal physiological functions without providing dosage information.

This product is not intended to diagnose, treat, cure, or prevent any disease.

Doctor's Best is Welzo’s chosen partner for CalmZ with Zembrin because this brand stands out in the marketplace for its robust approach to quality and ethical sourcing. This brand is recognised for its long-standing commitment to science-led supplement development and strong manufacturing partnerships, delivering consistent, well-documented products. Doctor's Best operates with a seed-to-shelf quality control mindset, ensuring every batch is traceable to its source plants and verified through advanced analysis. The manufacturer behind Zembrin maintains GMP-compliant facilities and upholds vegan, non-GMO, halal and kosher production standards, reinforcing reliability and safety across the supply chain. Our team evaluated this brand against others and highlighted its clear emphasis on ethical cultivation and environmental stewardship, including an ethical benefit-sharing agreement with the South African San Council. This diagnostic clarity and commitment to transparency align with Welzo’s standards, evidenced by our team of medical experts and our ingredient quality and purity standards. This brand was evaluated by our team of medical experts for compliance with our ingredient quality and purity standards.