For ice bathing and cold exposure, the immune system and cell protection are central: vitamin C and vitamin D3 contribute to the normal function of the immune system, while vitamin C also protects cells from oxidative stress and increases iron absorption – a sensibly matched set for active days in the cold season.
More and more people are discovering cold water for themselves – whether in a winter lake, a tub in the garden, or a cold shower in the morning. Deliberately exposing yourself to cold has become a fixed ritual for many, bringing structure to the day and rewarding the effort with a feeling of alertness.
Ice bathing has grown from a fringe activity into a fixed ritual for many people: the deliberate plunge into cold water, the deep breathing, the tingling feeling afterwards. Cold exposure challenges the circulation and the immune system – and especially in the cold season, when many ice bathers are active, nutrient supply comes into sharper focus. Shorter days often mean less sunlight, and the body has quite a bit to deal with between cold and season.
For the purpose of Ice Bathing & Cold, we've put together a set focused on the immune system, cell protection and basic supply during the cold season. It accompanies you through the winter months, when cold exposure and limited daylight coincide.
The aim here is explicitly not to attribute supernatural powers to cold water or to claim it defines away colds. Promises like that would be neither credible nor permissible. What makes sense instead is a sober look at the season: in winter, supply of certain nutrients – vitamin D above all – is naturally lower because sunlight is scarce. This is exactly where the set comes in: with the perfectly normal basic supply during a low-light time of year. The fact that many ice bathers are especially active in precisely this season makes the topic all the more relevant for them.
Why This Combination Works for Ice Bathing & Cold
At the centre are nutrients for the immune system and cell protection. Vitamin C contributes to the normal function of the immune system and contributes to the protection of cells from oxidative stress. Vitamin D3 contributes to the normal function of the immune system and contributes to the maintenance of normal muscle function – a key building block especially in the dark season, when the body's own production via the skin is limited. Vitamin K2 contributes to the maintenance of normal bones and complements D3 well.
Added to this are an iron building block (iron contributes to the normal function of the immune system and to the reduction of tiredness and fatigue), an OPC-rich pine bark extract with vitamin C, and further building blocks for individual basic supply. That way, the set covers the key themes of the cold season.
The focus is deliberately on nutrients with clearly authorised health claims – vitamin C, vitamin D, vitamin K, iron. These are the building blocks whose functions in the body are well established and that can be named credibly. We describe plant extracts like OPC as valued companions, without attributing specific effect promises to them. That keeps the set honest: it supports basic supply during a demanding season, rather than trading on the appeal of cold water.
The Products in the Set
At the centre are nutrients with clearly authorised claims – vitamin D3 + K2, vitamin C and iron. These are complemented by specialised building blocks for particular life stages. The short descriptions below help you choose the right core package for the cold season.
Vitamin D3 Depot + K2Pure® – 5,000 IU
The Vitamin D3 + K2 delivers high-dose vitamin D3 (5,000 IU) in depot form, combined with K2Pure®, 180 tablets. Vitamin D3 contributes to the normal function of the immune system and to the maintenance of normal muscle function – the classic winter building block for when the sun rarely shines. Vitamin K2 complements it for the maintenance of normal bones.
Pine Bark Extract – 475 mg OPC with Vitamin C
The Pine Bark Extract, made from French maritime pine, delivers 475 mg of OPC per capsule (25:1 extract, 95% OPC) plus vitamin C. The vitamin C it contains contributes to the normal function of the immune system and protects cells from oxidative stress. A popular building block for anyone who pays attention to cell protection during the cold season.
Iron Bisglycinate + Natural Vitamin C
The Iron Bisglycinate is a gentle, well-tolerated form of iron, combined with natural vitamin C. Iron contributes to the normal function of the immune system, to normal oxygen transport in the body and to the reduction of tiredness and fatigue; vitamin C increases iron absorption. A sensible combination for the dark season.
Glucosamine & Chondroitin with Vitamin C
The Glucosamine & Chondroitin is optimised with vitamin C. Vitamin C contributes to normal collagen formation for the normal function of cartilage. A complementary building block around joints and movement for active people who are out and about even in cold weather.
Nursing Complex with Fenugreek, Fennel & Omega-3 DHA
The Nursing Complex brings together fenugreek, fennel, omega-3 with DHA and folic acid. It's designed specifically for the breastfeeding period; DHA contributes to the maintenance of normal brain function. A specialised building block that only belongs in the matching life stage.
PMS-Intenso – Gentle Cycle Complex
The PMS-Intenso is a gentle cycle complex with chasteberry, lady's mantle, saffron, vitamin C, B6 and zinc. Vitamin B6 contributes to the regulation of hormonal activity, and zinc and vitamin C contribute to the normal function of the immune system. A targeted building block for anyone who wants extra support through their cycle.
The set thus bundles different needs under one roof. The hard core for the cold-and-immune purpose is the vitamins – vitamin D3 + K2 for the dark season, the pine bark extract with vitamin C for cell protection, and the iron bisglycinate with vitamin C for people with a corresponding need. Glucosamine & Chondroitin, the Nursing Complex and PMS-Intenso are specialised additions that only make sense if they match your personal situation. That way, you can pick out exactly what belongs to you from the set.
How to Combine Them
Rely on a base plus additions. Basic supply through the cold season: vitamin D3 + K2 daily with a meal containing some fat (vitamin D is fat-soluble), plus the pine bark extract with vitamin C for cell protection if needed. Around activity and cold: iron bisglycinate and glucosamine & chondroitin depending on personal need. Specialised building blocks: the Nursing Complex and PMS-Intenso are aimed at particular life stages and chosen individually.
Choose the two or three products that fit your situation. For the pure cold-and-immune purpose, vitamin D3 + K2 and the pine bark extract are the core package.
Pay attention to dosage with fat-soluble vitamins. The Vitamin D3 + K2 is high-dose in depot form – take it exactly according to the recommended intake, and not on top of other high-dose vitamin D products without knowing your status. Anyone who wants to know whether there's actually a shortfall can have their vitamin D level checked by a doctor; that's the cleanest way to find the right amount. Iron products, in turn, should only be taken long-term if there's an actual need – that too can be clarified with a blood test. That way, supplementation stays targeted rather than blanket.
Fundamentals First
With ice bathing, safety comes first. Ease into cold exposure gradually, never bathe alone in unfamiliar spots, focus on calm breathing, and listen to your body. A balanced, varied diet supplies most of the nutrients for the cold season. Supplements come in where supply typically runs shorter in winter – vitamin D, for instance, due to the lack of sunlight. Thought of in that order, the set is a sensible companion through the cold months.
Frequently Asked Questions (FAQ)
Why is vitamin D3 especially relevant in winter?
The body produces vitamin D through the skin with the help of sunlight. In winter, that's barely possible. Vitamin D contributes to the normal function of the immune system – which is why Vitamin D3 + K2 is the core building block of this set.
What's the best way to take Vitamin D3 + K2?
Vitamin D is fat-soluble, so it's best taken with a meal containing some fat. Stick to the recommended intake on the label and the dosage stated there.
What does the pine bark extract with OPC do?
The extract delivers OPC plus vitamin C. The vitamin C it contains contributes to the normal function of the immune system and protects cells from oxidative stress – a popular building block for the cold season.
Why combine iron with vitamin C?
Vitamin C increases iron absorption. That's why the Iron Bisglycinate combines a gentle form of iron with natural vitamin C. Iron contributes to the normal function of the immune system and to the reduction of tiredness and fatigue.
Do the products replace sensible cold adaptation?
No. Gradually getting used to cold exposure, calm breathing and safety during ice bathing are what matter most. The supplements only complement the nutrient base.
Note: Food supplements do not replace a balanced diet and a healthy lifestyle. If you have an existing medical condition, are pregnant, or are taking medication, talk to your doctor before use.
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
- EU Register of Authorised Health Claims — Zugelassene Claims zu Vitamin C, D, K und Eisen, 2024
- European Food Safety Authority (EFSA) — Wissenschaftliche Bewertung gesundheitsbezogener Angaben, 2023
- Robert Koch Institute (RKI) — Vitamin-D-Status der Bevölkerung in Deutschland, 2023
- German Nutrition Society (DGE) — Referenzwerte für Vitamin D und Eisen, 2024








