Calcium with KoAct is a calcium supplement that helps strengthen bones and support density through a chelated calcium and hydrolysed collagen blend. KoAct blends calcium with collagen to back the bone matrix and collagen turnover, quickly and easily. Life Extension brings decades of bone health focus and clear ingredient sourcing, which feels a touch old fashioned but thorough.

Available Sizes & Variants:

120 capsules - Daily dose for ongoing bone support.

Benefits & Features:

• Supports bone strength with chelated calcium and collagen for lasting resilience.
• The KoAct blend combines calcium with collagen to support the bone matrix and collagen turnover, quickly and easily.
• Vitamin D3 boosts calcium absorption for stronger bones.
• Dried plum extract and boron support bone preservation and maintain joint flexibility, making daily activities easier and less painful for active individuals.
• Life Extension brings decades of bone health focus, trusted for current Good Manufacturing Practices and clear ingredient sourcing.

Life Extension's Calcium (Bone Strength Formula) with KoAct draws on decades of bone health focus. KoAct blends chelated calcium with hydrolysed collagen peptides to nourish the bone matrix, while vitamin D3, magnesium, silicon, boron and dried plum extract support mineral retention and joint flexibility. The formula is manufactured under current Good Manufacturing Practices, with clear ingredient sourcing that Life Extension is known for. For anyone seeking calcium supplements for osteoporosis, this balanced blend offers reliable everyday support for stronger, more adaptable bones.

Vitamin D3 (as cholecalciferol)
Calcium (from 3000 mg KoAct®* Calcium Collagen Chelate and calcium fructoborate)
Magnesium (as magnesium citrate)
Silicon [from standardized Bamboo (Bambusa vulgaris) extract (stem)]
Dried Plum (Prunus domestica) extract (fruit) [standardized to 50% polyphenols by UV-Vis (50 mg)]
Boron (calcium fructoborate as patented Fruitex B® OsteoBoron®)

• GTIN: 737870172512
• Manufacturer: Life Extension
• Categories: Calcium SupplementsJoints, Bones & Muscles HealthLife ExtensionMineralsNew Arrivals
• 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 four (4) capsules daily, divided into separate doses. You can take them with or without food, or follow your doctor's instructions. Take 1 tablet daily\, preferably with a meal.

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

Calcium is a fundamental mineral that helps the structure and function of bones and teeth. This formulation pairs KoAct calcium, a chelated form with hydrolysed collagen peptides, to help maintain the bone matrix and mineral balance. It also contains supporting nutrients like vitamin D3, magnesium, silicon, boron and dried plum extract to support bone health.

This form emphasises a calcium source linked to collagen components, with KoAct described as a clinically studied blend intended to support collagen turnover and bone mineral density.

What Does Calcium Do?

Calcium helps with the normal maintenance of bone structure and mineral balance. Vitamin D3 helps calcium absorption, and magnesium supports bone mineralisation; silicon from bamboo may help calcium incorporation into bone and collagen synthesis, contributing to overall bone health, as noted in the formulation’s mechanism.

Other included nutrients such as boron and dried plum extract can support nutrient metabolism and potential bone-building cell activity.

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

Life Extension was chosen for its solid heritage in the supplement world and its focused commitment to bone health through KoAct, a clinically studied blend that blends chelated calcium with hydrolysed collagen peptides. This brand is recognised for its long-standing presence in the sector and its commitment to formulating products that align with science-led approaches to bone health.

Manufacturing excellence sits at the heart of Life Extension, with production aligned to current Good Manufacturing Practices (cGMP) as part of its standard operating procedures. This backbone of quality is reinforced by KoAct’s clinical study history, which shows improvements in bone synthesis and reductions in bone resorption in certain populations. Our medical team reviews such evidence as part of our vetting process to ensure alignment with Welzo’s standards. You can learn more about this evaluation from our medical team.

We rate Life Extension for this calcium-based bone support formula because of their solid manufacturing discipline and the brand’s demonstrated commitment to quality. This is further supported by our our quality certification process, which underpins the confidence we place in this partnership.