Life Extension Se-Methyl L-Selenocysteine delivers antioxidant defence and supports thyroid health, chosen for its highly bioavailable organic form and Life Extension's proven quality standards. The MeSeC form is rapidly absorbed and gentle on the stomach, helping you maintain healthy oxidative balance day-to-day. Life Extension's GMP standards and traceable sourcing mean you get a reliable, allergen-friendly vegetarian capsule.

Available Sizes & Variants:

90 vegetarian capsules - daily dose for antioxidant support.

Benefits & Features:

• Supports antioxidant defence and healthy cell function with the organic Se-Methyl L-Selenocysteine.
• Assists thyroid hormone metabolism and activity.
• Supports immune health and resilience during daily stress.
• Gentle on the stomach.
• Se-Methyl L-Selenocysteine is rapidly absorbed and supports the body's production of selenium containing proteins, which help antioxidant defence, immune function, and thyroid hormone metabolism in daily use.

Life Extension Se-Methyl L-Selenocysteine sits in a long standing brand story of quality and scientific substantiation. Manufactured in GMP-certified facilities, this vegetarian capsule is allergen-friendly and free from artificial additives. The star ingredient Se-Methyl L-Selenocysteine is rapidly absorbed, supporting antioxidant defence and thyroid health through selenium containing proteins. Life Extension’s commitment to traceability and safety sets it apart, making it a reliable choice for daily wellness routines, including liver support supplements, a multivitamin with iron, and even probiotics for weight loss when used together.

Selenium (as Se-Methyl L-Selenocysteine), Selenium (as Se-Methyl L-Selenocysteine)

• GTIN: 737870187998
• Manufacturer: Life Extension
• Categories: Best SellersLife ExtensionSports Supplements Black Friday Sale
• Best buy: 6 - 24 months+

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.

Take one (1) capsule daily, with food, or as recommended by a healthcare practitioner. Store in a cool, dry place, out of reach of children. Do not exceed the recommended dose. Do not purchase if the outer seal is broken or damaged. Consult with your physician if you are undergoing treatment for a medical condition or if you are pregnant or lactating.

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

*Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.

The Active Ingredient Is: Selenium (Se-Methyl L-Selenocysteine)

Selenium is a vital trace mineral linked to everyday cellular function and antioxidant defence. The Se-Methyl L-Selenocysteine form is an organic, highly bioavailable variant used to back these roles. This form is absorbed smoothly and is easy on the stomach.

This form helps to support antioxidant processes and can contribute to normal thyroid hormone metabolism and immune health [which matters in daily life]. It’s produced to high quality standards and sourced to keep purity and potency.

What Does Selenium (Se-Methyl L-Selenocysteine) Do?

Selenium helps keep antioxidant defence through selenoproteins that shield cells from oxidative stress and support normal cellular function. It also plays a role in normal thyroid function, and EFSA recognises its contribution to immune health [which matters to you].

This nutrient takes part in the synthesis and activity of selenoproteins such as glutathione peroxidase, supporting daily metabolic processes and overall wellness.

This brand, Life Extension, really stands out for quality through its longstanding commitment to ingredient integrity and scientific substantiation. Their reputation in the field is built on solid manufacturing practices and a clear focus on traceability and supplier due diligence, which aligns with our standards for reliable and evidence-based supplements. This brand was assessed by Welzo's healthcare professionals for compliance with our quality assurance criteria, and they consistently show strong manufacturing ethics and product transparency.

Product-specific capability is demonstrated by Life Extension Se-Methyl L-Selenocysteine, delivering 200 mcg per vegetarian capsule in a highly bioavailable organic form. The formulation supports antioxidant defence and thyroid hormone metabolism, with a vegetarian, allergen-free profile that matches consumer needs. The brand’s GMP-certified facilities and thorough testing (identity, purity, potency, contaminants) ensure consistent quality across batches, reinforcing trust in this specific supplement.

Welzo chose Life Extension for this pairing because their established quality standards together with rigorous in-house and third-party testing provide a reliable foundation for health-focused shoppers. This alignment with our evaluation process helps ensure customers receive a product that meets both safety and performance expectations.