Quick answer

A sensible cold season kit relies on vitamin D3 with K2, zinc, and vitamin C as well as iron – all nutrients that contribute to the normal function of the immune system. The foundation, however, remains enough sleep, exercise, a varied diet, and thorough handwashing; the kit is not a remedy for colds.

When the days get shorter, the heating comes on, and everyone around you is sniffling, one topic moves back into focus: the immune system. The cold season challenges the body – less sunlight, dry indoor air, and crowded trains and offices keep the immune system in constant action. A well-thought-out cold season kit made of a few well-matched supplements can help consciously support the basics of the cold months – as a complement to sleep, exercise, and a varied diet.

In this guide, we'll introduce you to a sensible set for cold season: from vitamin D3 with K2, to zinc, to vitamin C from several components. All claims stick to recognized EU statements, and everything complements a healthy lifestyle instead of replacing it. We'll also show you which component is the core of the kit, how to combine the products correctly, and what to watch out for with zinc and iron.

One thing upfront, so expectations are set correctly: no supplement is a remedy for colds. What carries the immune system through the cold season is enough sleep, exercise, a varied diet, and everyday hygiene. Beyond that, a well-thought-out kit covers the nutrients that typically become scarce in winter – and that's precisely its sensible contribution, no more and no less.

Why This Combination Works for Cold Season

A strong foundation for the cold season rests on several legs: the immune system, energy, and the nutrients that typically become scarcer in winter. The set covers exactly these points – with components whose functions are officially recognized.

The star of the dark months is vitamin D: it contributes to the normal function of the immune system – and because our body produces it mainly through sunlight, it often becomes scarce in winter. The zinc in the Fadogia complex contributes to the normal function of the immune system and to the protection of cells from oxidative stress. Vitamin C, included in several products at once, contributes to the normal function of the immune system and to the reduction of tiredness and fatigue. The iron included also supports normal immune function. Together, vitamin D, zinc, vitamin C, and iron cover the immune basics – four recognized components that complement each other well.

Why these four in particular? Because each becomes relevant during the cold season for a different reason. Vitamin D is produced in the skin with the help of sunlight – and that's exactly what's largely missing from October to March at our latitudes. Vitamin C is found in fresh fruit and vegetables, but in winter many people reach for colorful fresh produce less often. Zinc and iron, in turn, are trace elements whose supply can vary from person to person. A well-thought-out kit bundles these components so you don't have to compare and coordinate four separate products yourself. It takes the selection work off your hands and delivers the recognized immune nutrients in one coordinated combination.

The Products in the Set

Vitamin D3 Depot + K2Pure® – 5,000 IU

The core component of the dark months. Vitamin D3 Depot with K2Pure®, highly dosed with 5,000 IU in 180 tablets combines vitamin D3, which often runs low in winter, with vitamin K2. Vitamin D contributes to the normal function of the immune system, and vitamin K contributes to the maintenance of normal bones. For many, the single most important component of the cold season.

Fadogia Strength Complex with Ashwagandha & Zinc

The Fadogia Strength Complex with ashwagandha and zinc, 10:1 extract with 1000 mg per daily dose brings the zinc it contains into the set – a nutrient that contributes to the normal function of the immune system and to the protection of cells from oxidative stress. Ashwagandha and fadogia are traditionally valued plants; we deliberately make no health claims about them.

Pine Bark Extract with OPC & Vitamin C

Pine Bark Extract from French maritime pine, 25:1 with 95% OPC and vitamin C delivers an antioxidant-rich profile plus vitamin C, which contributes to the normal function of the immune system and to the reduction of tiredness and fatigue. A fitting companion for the gray weeks between autumn and spring.

Iron Bisglycinate with Natural Vitamin C

When energy drops in winter, iron becomes relevant. Iron Bisglycinate with natural vitamin C relies on a gentle, well-tolerated form: iron contributes to the normal function of the immune system and to the reduction of tiredness and fatigue, and vitamin C increases iron absorption. Please only supplement iron if you have a proven need.

Glucosamine & Chondroitin with Vitamin C

Glucosamine and Chondroitin, enhanced with vitamin C, is an optional component for anyone who stays active in winter and wants to keep an eye on their joints; the vitamin C it contains contributes to normal collagen formation for the normal function of cartilage.

PMS Intenso – Cycle Complex with Chasteberry & Saffron

For people whose well-being fluctuates with their cycle, the PMS Intenso Cycle Complex with chasteberry, lady's mantle, saffron, vitamin C, B6, and zinc is an optional add-on component. The zinc and vitamin C it contains also contribute to the normal function of the immune system.

How to Combine Them

The heart of the kit is your daily immune baseline: it's best to take vitamin D3 + K2 with a meal that contains some fat, since both vitamins are fat-soluble. Combine it throughout the day with a vitamin C source from the pine bark extract – vitamin C is water-soluble and isn't stored, so spreading it out evenly is worthwhile.

It's best not to take the Fadogia complex with zinc directly together with large amounts of iron, since zinc and iron can compete with each other for absorption – so leave a bit of time between the zinc and iron components. Iron bisglycinate works well on an empty stomach with a vitamin C drink, but without coffee or tea. Glucosamine & chondroitin and the cycle complex are add-on components that you only add if they fit your situation. Start lean – vitamin D3 + K2 plus a vitamin C source form the sensible core for most people.

A note on dosage: for the fat-soluble vitamins D and K, and for trace elements like zinc and iron, "more is not better" applies. Stick to the serving recommendations of the individual products and make sure you don't unintentionally double up on nutrients from several products. Vitamin D can also be maintained as a year-round routine, since the requirement at our latitudes is hard to cover through sunlight alone, especially from October to March. If you want to know exactly where you stand, you can have your vitamin D status checked once with a blood test and adjust your intake accordingly.

Fundamentals First

No kit replaces what carries you through the cold season the most: enough sleep, regular exercise outdoors (even that bit of winter light counts), a varied, vegetable-rich diet, and thorough handwashing. Air out rooms regularly, don't let indoor air get too dry, and drink enough – even in winter. Supplements support these fundamentals; they don't replace them. If you feel persistently sick or exhausted, or a cold won't clear up, talk to a doctor.

Frequently Asked Questions (FAQ)

Which component is the most important during cold season?

For many people, vitamin D3 is the central component of the dark months, because the body produces it mainly through sunlight and it often becomes scarce in winter. Vitamin D contributes to the normal function of the immune system. The set combines it with K2 for the bones.

Why is vitamin C included in several products?

Vitamin C contributes to the normal function of the immune system and to the reduction of tiredness and fatigue. Because it's water-soluble and isn't stored, an even intake throughout the day makes sense – that's why it's deliberately included multiple times.

Can I take zinc and iron at the same time?

Zinc and iron can compete with each other for absorption. So leave a bit of time between the zinc-containing Fadogia complex and the iron bisglycinate. You should also only supplement iron if you have a proven need.

Does this kit prevent colds?

The kit provides nutrients that contribute to the normal function of the immune system. However, it's not a remedy for illness and replaces neither sleep, exercise, and diet nor medical treatment. It supports the fundamentals of the cold season.

What's the correct way to take vitamin D3 + K2?

Best taken with a meal that contains some fat, since both vitamins are fat-soluble. With highly dosed products, it's worth taking a look at your own needs – if in doubt, your vitamin D status can be determined with a blood test.

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Health notice: This guide is for general information purposes only and does not replace individual medical or pharmaceutical advice. Food supplements are not a substitute for a balanced, varied diet and a healthy lifestyle. If you have health concerns, are pregnant or breastfeeding, or are taking medication, please consult a doctor or pharmacist. How our guides are created →

Sources

  1. European Commission – EU Register of Nutrition and Health Claims — Zugelassene Health Claims zu Vitamin D, Zink, Vitamin C und Eisen, 2024
  2. Robert Koch Institute — Informationen zu Vitamin D und zur Immunfunktion, 2023
  3. EFSA – European Food Safety Authority — Wissenschaftliche Bewertungen zu Nährstoff-Funktionen des Immunsystems, 2023
  4. German Nutrition Society (DGE) — Referenzwerte für die Nährstoffzufuhr, Vitamin D und Zink, 2024
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