Life Extension Super K

Name: Life Extension Super K
Brand: Life Extension
SKU: 737870233435
Price: 21.99 GBP
Availability: InStock

Brands: Life Extension

£21.99

Life Extension's take on vitamin K2, in a softgels format that is easy to keep to day after day.

Why people take it

Vitamin K contributes to the maintenance of normal bones
Vitamin K contributes to normal blood clotting

How to use

Take as directed on the pack, ideally with food and at the same time each day.

Good to know

Format: softgels
Caffeine free

A food supplement, not a substitute for a varied diet and healthy lifestyle. Do not exceed the stated dose. Keep out of reach of children.

Quantity

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Categories : Caffeine-Free Supplements, Everyday Health Supplements, Life Extension, Vitamins & Supplements

SKU: 737870233435

At a glance

£0.24

per daily dose

Limited

evidence for vitamin k2 (mk-7)

Our honest take

A very high-dose vitamin K softgel: 2,000 µg of K1, 1,000 µg of K2 as MK-4 and 180 µg of K2 as MK-7, over 40 times the daily reference intake in total. Most people get enough vitamin K from leafy greens, and evidence that extra K helps bones or arteries in healthy people is limited. There is no set upper limit for vitamin K, but anyone on warfarin must avoid it, and for most people a product like this is not needed.

You have been advised to take high-dose vitamin K and want all three main forms
You take warfarin or another vitamin K antagonist
You eat leafy green vegetables: you probably get enough vitamin K already
You are vegetarian: the softgel contains gelatine

The science

Vitamin K2 (MK-7)· evidence: Limited

Vitamin K2 (menaquinone, usually as MK-7 in supplements) is one of the forms of vitamin K. The body needs vitamin K to make proteins involved in blood clotting and bone. Most adults get enough vitamin K from green vegetables, vegetable oils and some fermented foods, and true deficiency is rare in healthy adults.

Vitamin K2 is often sold alongside vitamin D3 on the idea that it helps direct calcium into bone. Trials of K2 on bone density and fractures are small and mixed, and the effect in well-nourished people is uncertain. Claims about arteries or heart health are not established.

Adding K2 to a vitamin D supplement is reasonable but not necessary for most people. It mainly adds cost.

Authorised health claim
Vitamin K contributes to normal blood clotting. Vitamin K contributes to the maintenance of normal bones. (Applies where a daily dose gives at least 15% of the NRV, i.e. 11.25 µg.)

Typical dose: Adults need about 1 µg per kg of body weight a day (around 70 µg for a 70 kg adult), mostly met by diet. Supplements usually give 45 to 200 µg of MK-7.

Safety: Vitamin K can stop warfarin and similar anticoagulants (vitamin K antagonists) working properly. Anyone on warfarin must not take vitamin K supplements without talking to their GP or anticoagulant clinic. The FSA notes that 1 mg or less a day from supplements is unlikely to cause harm in other people.

Research we looked at:
NHS. Vitamin K. nhs.uk/conditions/vitamins-and-minerals/vitamin-k
EFSA NDA Panel. Dietary reference values for vitamin K. EFSA Journal 2017;15(5):4780.
Mott A, Bradley T, Wright K, et al. Effect of vitamin K on bone mineral density and fractures in adults: an updated systematic review and meta-analysis of randomised controlled trials. Osteoporos Int 2019;30(8):1543-1559.

Ingredients & nutrition

Per daily dose (1 softgel): vitamin K1 (phytonadione) 2,000 µg, vitamin K2 as menaquinone-4 1,000 µg, vitamin K2 as MenaQ7 menaquinone-7 180 µg (total vitamin K 4,240% NRV); vitamin C (as ascorbyl palmitate) 10 mg. 90 softgels, 90 daily doses.

Other ingredients: extra virgin olive oil, gelatine, glycerine, beeswax, purified water, carob colour, maltodextrin, microcrystalline cellulose. Not suitable for vegetarians.

Always check the pack you receive, as manufacturers sometimes update recipes.

How to use

Take 1 softgel a day with food. Do not exceed the stated daily dose. Do not take if you are on warfarin or another vitamin K antagonist unless your doctor agrees.

Price per dose & how it compares

Product	Size	Price	Per daily dose
This product	90 softgels	£21.99	£0.24
Life Extension Low Dose Vitamin K2 (MK-7)		from £17.35	£0.19
Doctor's Best Natural Vitamin K2 MK7 with MenaQ7		from £15.56	–
Jarrow Formulas K-Right		from £42.99	£0.72

Cost per daily dose lets you compare packs of different sizes fairly.Worked out from our current prices.

Food supplements should not replace a varied, balanced diet and healthy lifestyle. General information, not medical advice. Speak to your GP or pharmacist first if you are pregnant or breastfeeding, have a medical condition or take medication.