Back to School, Back to the Sniffles: An Honest Irish Guide to Immune Season
There's a rule in every Irish house with school-age kids in it, and nobody wrote it down because nobody had to. The school year starts. Within a fortnight, someone is coughing. Within a month, everyone has had it, and at least one adult has had it worse than the child who brought it home. My wife is currently "swallowing razor blades", I was told this morning. I feel fine myself, but it's probably in the post.
It arrives with the new copybooks. The uniform still fits, the lunchbox is still novel, the September light is still doing its best impression of summer, and then a small person walks in the door on a Tuesday with that particular glassy look and says they're grand. They are not grand. By Thursday there's Calpol on the counter and a debate about whether it's "just a cold" or something worth a call to the GP, who will tell you it's viral, keep the fluids up, and you'll see them again in three weeks for the next one.
This is a post about why that happens, what the actual evidence says about doing anything about it, and where a supplement earns its place in the cupboard versus where it's just something to feel busy with. We sell all this stuff, so read that as you like, but we'd rather be straight with you than sell you a tub of something that does nothing.
Why September does this to us
It isn't bad luck and it isn't that your child's school is grubbier than anyone else's. It's numbers.
Over the summer, kids mix with a handful of people. From the first day back, they're in a room with thirty others, each of whom spent July and August collecting a different set of viruses from a different set of cousins, holiday campsites and Wexford beaches. The classroom is where all of that gets pooled. Junior Infants and crèche are the worst for it, because the youngest kids have met the fewest germs and share everything, including whatever's on their hands.
Then Ireland does its bit. The weather turns, the windows close, the radiators go on, and the coats that got soaked at the school gate steam quietly on the hall banister. Everyone spends more time indoors, closer together, in drier air. The days shorten fast, and by the mid-term break we're into the part of the year where the sun sits too low in the sky for skin to make any vitamin D at all, which matters more than most people realise and which we'll get to.
Add the sleep that quietly slips once the routine kicks in, and the fact that a lot of us adults are running on the same six hours we've been running on since June, and you've got the annual outbreak. It's not a mystery. It's arithmetic.
What actually works (the boring bit first)
Sleep, handwashing, food, daylight. That's the list, and it's not exciting, and it does more than anything in a capsule.
Handwashing is the big one for kids, and it's a losing battle worth fighting anyway. Before food, after school, after the toilet. Not the sanitiser, which was fine for 2020 but doesn't do much against the viruses that cause most colds. Soap, water, the full song if that's what it takes.
Sleep is the one that gets sacrificed first and shows up in the immune system fastest. If the September routine has slid, that's worth fixing before you buy anything.
Daylight matters because it's free and because from late October it's gone. Get them out in it while it's still there.
None of that is a product. Now the part that is.
Vitamin D: the one the HSE actually tells you to take
If you take one thing from this post, take this. Ireland sits far enough north that from about Halloween to St Patrick's Day, your skin makes no meaningful vitamin D from sunlight, regardless of how many bright crisp days there are. The HSE doesn't hedge on this. Its guidance is that everyone in Ireland needs a vitamin D supplement over winter, and it gives the doses by age: 5 micrograms a day for children aged 1 to 4, 10 micrograms for ages 5 to 12, and 15 micrograms for everyone from 13 up. Halloween to Paddy's Day, every day (HSE, vitamin D).
That's a public health body, not a supplement shop, telling you to do this. It's about as close to settled as this area gets.
Why it matters for the back-to-school season specifically: vitamin D has an EU-authorised role in the normal function of the immune system, and beyond that, a large 2017 analysis in the BMJ pooled trial data from around 11,000 people and found that daily vitamin D supplementation gave a modest protective effect against acute respiratory infections, with the clearest benefit in people who were low to begin with (Martineau et al., BMJ 2017). Modest is the honest word. It's not a force field. But in a country where most of us are low by December, it's the cheapest, best-evidenced thing on this page.
Two practical notes. For children, the HSE advice is a vitamin D-only liquid or drops at the age-appropriate dose, and you'll get those in any pharmacy, so ask there. For yourself, our Vitamin D3 3,000iu is a higher-strength adult capsule, well above the HSE's 15 microgram baseline and under the 4,000iu (100 microgram) daily upper limit that currently applies in Ireland, but it's an adult product, not one for the kids. If you're not sure what strength suits you, a pharmacist will tell you in thirty seconds.
One thing worth knowing while we're here. That 4,000iu ceiling may not last. The EU is working towards harmonised maximum levels for vitamins in supplements, and the draft modelling would cut the vitamin D cap well below where Ireland sits today, calibrated around sunnier member states that don't have our winter. We've written about it at length in our piece on the EU supplement crackdown, and if a higher-dose vitamin D is part of how you get through an Irish winter, it's worth five minutes and a signature.
Vitamin C and zinc: the other two with the paperwork
Vitamin C and zinc are the other nutrients that hold an EU-authorised claim for contributing to normal immune function. Vitamin C's role is well characterised, a 2017 review in the journal Nutrients laid out how it supports several functions of both the innate and adaptive immune system (Carr and Maggini, Nutrients 2017), and zinc carries its own authorised claim.
Be realistic about what that means. Neither will stop you catching what's going round the classroom. What they do is make sure the system doing the fighting isn't running short of what it needs, which for an adult on a rushed September diet is not a given. Zinc with Vitamin C covers both in one capsule, and if you'd rather vitamin C on its own, the natural extracts version does that.
These are adult products. Children, we're told, get plenty of vitamin C from a normal diet, and zinc supplementation in kids is a conversation for the pharmacist, not something to start off a blog post.
The mushrooms, honestly
We're known for functional mushrooms, so you'd expect us to push them here. We won't, much.
Reishi and Chaga have centuries of traditional use behind them, particularly through the darker months, and they're popular with our customers for good reason. But the human evidence for mushrooms and immunity is earlier-stage. We stock them because people value them and the research is developing, not because we can promise a September outcome. If you'd like the full picture, our mushroom range page sets out what's studied and what's still traditional use.
For an adult who wants the ritual, Chaga is the one we'd point to for general everyday use, and Reishi is the one people reach for in the evening. Neither is for children.
The parent who never gets sick
Every house has one. The adult who hasn't had a cold in five years and then, one October, gets absolutely flattened by whatever came home from senior infants. Usually it's the one doing the school runs, the lunches, and the 3am Calpol shift, on the least sleep, with the least daylight. In our household, this is me.
And if that's you in your house, then the honest advice is sleep first, then the vitamin D, then the basics above. Magnesium is worth a mention here, not for immunity directly, but because it has a huge role in normal psychological function and relaxation and in reducing tiredness and fatigue, and a lot of adults are short on it. MagTech is our capsule, taken in the evening. The wind-down it supports does more for the immune system than the capsule does on its own. It's honestly great stuff.
What we'd actually do
Handwashing and sleep for the whole house. Vitamin D from Halloween for everyone, at the HSE doses, from the pharmacy for the kids and from us or anywhere else for the adults. Vitamin C and zinc for the adult running on empty. Mushrooms if you like them, with your eyes open about the evidence. And a GP for anything that's more than a cold, lasts longer than it should, or involves a child who's properly unwell rather than just miserable.
That's the list. Order by 4pm and we'll ship it the same day from Dublin, which matters slightly more than usual when the whole house has gone down and nobody's leaving it.
Frequently asked questions
When should Irish kids start taking vitamin D?
The HSE says from Halloween to St Patrick's Day, every year, at 5 micrograms a day for ages 1 to 4 and 10 micrograms for ages 5 to 12, as a vitamin D-only liquid or drops. Some parents start a little earlier, from the mid-term break, once the clocks go back and the daylight goes. Ask your pharmacist for a suitable children's product.
Do immune supplements stop kids catching colds at school?
No, and anyone who tells you otherwise is selling something. Vitamin D, C and zinc support the normal function of the immune system, which is a different thing from preventing infection. The classroom does the classroom's work regardless. What supplements can do is make sure nobody in the house is running short of what their immune system needs.
Are mushroom supplements safe for children?
We don't recommend them for children. There's no authorised immune claim for any mushroom, the human evidence is earlier-stage, and children's dosing hasn't been studied. Keep them for the adults, and keep the vitamin D for the kids.
How long does the back-to-school cold season last?
In our experience, September through to the Christmas holidays, with a lull over the break and a second, smaller round in January. The overlap with the vitamin D winter isn't a coincidence.
This article is for general information only and is not medical advice. Always consult a GP or pharmacist about supplements for children, or before starting a supplement if you are pregnant, breastfeeding or on medication.