Vitamin D supplement which

A supermarket own brand will be as good as any other.

Don't expect miracles though. You are probably just getting old.

You’d be better with folic acid tablets. Vit D is for bone health.

Not just for bone health

No, but it’s not known for its fatigue busting qualities. Iron and folic acid are good for that. Are you sleeping ok as far as you know? I’m thinking sleep apnoea?

Need extra calcium to absorb the Vit D. That is why they are usually together in the one tablet. Your GP should be able to check your Vit D levels, probably quite low this time of the year. Do not think it will help your tiredness though.

Lack of Vitamin D has also been linked to muscle weakness, fatigue, and even mental health. Studies have shown that Vitamin D deficiency can contribute to an impaired immune system, making it more difficult to fight infections. Vitamin D receptors in our brains help brain cells receive and understand chemical signals – a lack of Vitamin D is likely to affect the way our brain communicates.
I take 5000iu D3 on the advice of my specialist for my auto immune condition which is destroying my joints and brain. I did hope it would help with my sweaty head but it's made no difference to that.

DH’s Parkinson’s consultant advises his taking vit D so he does.

FF thank you. I wouldn’t have asked if I hadn’t had a good idea of the link you highlight. I’ll try D3 you recommend.

I also don't think taking Vitamin D will help with tiredness but if you are older it is certainly worth taking a small dose each day, without calcium if you don't need it. Holland and Barrett sell both low and higher dose Vitamin D3 tablets and they last ages. I am in good health but for a long while now take a daily low dose 10μg table, just to tick over.
For a few days just try upping your water intake, especially later in the evening and reducing caffeine. Keep a water bottle near you and sip this from time to time during the day. I now never go out without some water. Our central heating can dehydrate us more than we realise. If this doesn't help then it's on to Plan B.

D3 is best. I use this one plus a multivitamin

I get it in H&B or Sainsburys.

I take it for M.E. ( CFS) and fibromyalgia.

Sorry, this one.

No harm in trying it Yehbutnobut.
Sainsburys/Tesco have it also Tesco have 3 for 2 offers on at times.

If it doesn’t work you just get expensive wee.

I take healthy origins 5000iu D3 which I normally get from Amazon but for some reason they don't have them at the moment in that strength just 1000iu and 2000iu. They are tiny little gel capsules which are really easy to take. Looks like I'll have to get them elsewhere but Bigvits have them.
bigvits.co.uk/product/vitamin-d-3-5000iu-x-360sgels-2/

It is recommended that we all take vitamin D3 in winter. I think it needs to be the D3 rather than just D.

Have you had your iron levels checked OP? Low levels will cause your symptoms.
I also think if you really are deficient in vit. D a holiday in the sunshine would do more to buck you up than pills.

vitamin D3 (cholicalciferol) with vitamin K from oxford vitality

I have just upped my dosage to 5000 units a day. I did pin prick blood tests years ago as part of worldwide d`action research and 5000 units was optimum for me to reach the best result. I let dosage slide all through summer to 1000 units, which I regret as I need th eoptimum amount for bone density and to avoid auto immune disease. In a new home, I am back on the straight and narrow

Interesting info on here

www.grassrootshealth.net/project/daction/

btw an easy way to roughly check iron defficiency is to pull lower eyelid down and observe the colour, should not be too pale in the eyelid

Yehbutnobut, it would be MUCH better to make a routine appointment with your GP and ask if you can have a full blood count to rule out anaemia (or any other problem) and also to have your Vitamin D levels checked. Vitamin D is not just about bone health, its necessary for your immune system and plays a part in feelings of wellbeing. I developed a profound and unexplained depression in my late 50s and was found to have a very low level of Vitamin D. My GP prescribed High dose vitamin D as per NICE guidelines - I take one capsule per month in the summer months and two per month in the winter. My depression lifted and has never returned. Moreover I've not had the slightest cold / flu / sniffle in over 5 years. Can I also point out that you need Vitamin D to absorb Calcium, not the other way round. But there is absolutely no point in taking extra Vitamin D if you are not deficient.

Yes, recommended we take this supplement during winter anyway so thanks for recommending D3. Therefore I’ve started taking them and (placebo effect?) feel better already.

Lack of Vitamin D can make you feel very unwell, as I discovered, when a blood test revealed I had no vitamin D at all in my system.
I needed an osteoporosis infusion, but couldn't have it until my Vitamin D was back up to a certain level.
It tooks months of a very high dose of VitD capsules, combined with Adcal D3, to remedy things.

When get to that stage, you need a doctor's prescription, no over the counter supplement will remedy the deficiency.

I agree with GrannyLaine. Go and ask for a blood test at your GP's. I had very low levels and was prescribed 20,000iu twice a week for 8 weeks, followed by a daily dose of 800iu.

My level is up to normal now and I'll carry on buying cheap D3 supplements from the supermarket.

My symptoms were fatigue and bone/muscle pains, both of which have now improved.

And my finger nails have started growing again, so I'm assuming the VitD3 is helping with calcium absorption.