

The Immunity Booster Kit combines the vitamins D3 and K2 in EnDuro D with the vitamin C in Endurance C, at a better price than buying them separately. Vitamins D and C contribute to the normal function of the immune system; vitamin C contributes to the protection of cells from oxidative stress.
What’s in the kit:
Food supplements should not be used as a substitute for a varied and balanced diet and a healthy lifestyle.
Free from banned substances.
In autumn and winter there’s less sunlight and more colds going around, and hard training puts demands on your immune system too. The Immunity Booster Kit brings together the two nutrients we think matter most not to neglect at this time of year – vitamins D and C – at a better price than buying them separately.
Each softgel contains 50 µg (2000 IU) of vitamin D3 and 1680 µg of vitamin K2 (MK-4 and MK-7), in olive oil. Vitamin D contributes to the normal function of the immune system, to the maintenance of normal bones and normal muscle function, and to normal absorption/utilisation of calcium and phosphorus. Vitamin K contributes to normal blood clotting and to the maintenance of normal bones.
Each serving provides 950 mg of vitamin C from calcium ascorbate, ascorbyl palmitate and rose hips, plus 700 mg of citrus bioflavonoid complex and 500 mg of hesperidin. Vitamin C contributes to the normal function of the immune system and to maintain the normal function of the immune system during and after intense physical exercise (the beneficial effect is obtained with a daily intake of 200 mg of vitamin C in addition to the recommended daily intake), and to the protection of cells from oxidative stress.
Want a more complete kit? On top of these, the Super Immunity Booster Kit also includes AO Booster and Clear Day.
We think these are the two nutrients athletes should pay the most attention to in autumn and winter. Vitamin D contributes to the normal function of the immune system – and in winter there’s barely enough sunlight for your skin to make enough of it. Vitamin C also contributes to the normal function of the immune system, including during and after intense physical exercise. Alongside D3, EnDuro D also contains vitamin K2, and alongside vitamin C, Endurance C also contains citrus bioflavonoids.
The Immunity Booster Kit contains two products: EnDuro D and Endurance C. On top of these, the Super Immunity Booster Kit also includes AO Booster (the complete vitamin E family, lutein, astaxanthin) and the Clear Day formula (olive leaf extract, quercetin, resveratrol, bromelain).
Yes, you can take the products together, with meals. You’ll find the detailed dosage on the How to Use tab.
One EnDuro D softgel contains 50 µg (2000 IU) of vitamin D3. The European Food Safety Authority (EFSA) has set the tolerable upper intake level for vitamin D at 100 µg (4000 IU) a day for adults; if you take 3 softgels a day in the winter months, or also use other products containing vitamin D, it’s worth checking your total daily intake with your doctor – ideally with a vitamin D blood test.
Endurance C is vegan. EnDuro D is not: the vitamin D3 is derived from lanolin (wool grease), and the softgel is made from gelatin.
Yes. Our supplements are made in accordance with US dietary supplement manufacturing regulations (21 CFR 111): every raw material used is tested for purity, potency, identity and integrity, and checked at every stage of production – blending, encapsulation, packaging materials and finished product – before it is released for sale.
In a cool, dry place, between 5 and 30 °C, away from direct heat and sunlight. Softgels may stick together in the heat – if so, put the bottle in the fridge for a few hours, then shake them apart. The products keep their quality for 4 years from the date of manufacture (MFG); once opened, use them within 6 months.
You’ll find the exact dosage, ingredients and nutrition table of each product on its product page.
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