I'm tired all the time

Just be careful with B12. I took a combined iron and other supplements along with a B12 and I was stupidly doubling the B12. Plus I probably had plenty in my diet. I was trying to take care of myself but gave myself toxic levels of B12. I had weird fizzy fingertips and felt all jangly. Stopped as soon as I stopped the B12 but they don't warn you!

What's your lifestyle like? Meals, sleep, exercise, general health, caring responsibilities etc.

Because 35 hours a week isn't a huge amount, so to be taking to your bed so early with exhaustion suggests it has to be caused by something else?

I don't often reply but this really resonated OP - I am similar (And have been for months, thinking " I do feel really tired - surely this isn't normal"), and I've just got a full set of blood tests done

this article pushed me to finally going to the GP: https://www.theguardian.com/society/2025/nov/02/why-do-i-feel-tired-iron-deficiency-symptoms-anaemia-fatique-exhaustion

it's about iron deficiency, but , as other posters said, you can also experience fatigue from several other things such as low Vitamin D or B12, or magnesium, or underachieve thyroid etc

I can post the list of blood tests I got, if it helps, @Toucan22 ? (results in a week!!!)

edit: just to add - for those with low iron, the article mentions IV iron and why it might work much faster (and bypasses stomach so fewer side effects) so worth looking into if you've been diagnosed with low iron and if iron tablets not working for you

What is your lifestyle like around work. Do you eat well and drink plenty of water? Water and good nutritious food make such a difference to my energy levels. Do you drink alcohol. Giving that up transformed my life.

I have used something called Gentle Iron from the health food shop. It hasn't had the alarming effects on my digestion that standard iron supplements have 😬

So exhausted in a part time job even if it is emotionally and mentally draining, I'd think there is an underlying cause. In my case I was very low Vit D. Go to the GP and ask for bloods to be done (just in case it's something other than vitamin deficiency).

I take a whole host of supplements now, and am much better.

Wild Nutrition Iron Plus, look them up. I have the same issue with iron supplements.

I was very anemic, gor ny levels up with ferrous ferritin and have now moved to spatone first thing - its a lower dose but comes pre-combined with vit c and is easy to drink and gentle on the tummy.

I've also started nutrition geeks magnesium.

I feel you OP. I could nap every day, so tired in the evenings but then struggle to get off to sleep so the vicious cycle begins again. Trying everything to get my energy up!

Edit: ferrous fumerate not ferritin 🤦‍♂️

Very good. If I really have to sleep I even take 3!

Ive just started their magnesium, how are you finding it?

I haven't. I've got their magnesium, but I have B12 drops from somewhere else. I get them all on Amazon (slight shameface) so I don't pay delivery.

Have you tried the iron B12 one? Just about to order, free delivery too!!

I find the herbal iron supplements much gentler - Floradix liquid or capsules.
Or Feroglobin - not the tablets but the little grains in clear capsules. Also gentler on stomach.

Best taken with some vitamin C like fresh OJ.

Go low carb. Changed my life.

I use Nutrition Geeks too. They do a D3+K2 as well which I'd recommend over simple Vitamin D.

sorry @Richtea67 I was meant to quote @BabyBabyBaby4433

I was just looking at the nutrition geeks ones. They do a combined iron and b12

I was very anemic and out on very high dosage of iron tablets. 300mg a day. 🤢. It played havoc with my stomach but I worked out if I took it last thing at night I could cope. Used to wake up pretty early needing the loo but id sleep through the nausea and bloating. My body did get more tolerant.

I've now had the mirena coil fitted because with my peri flooding periods, even that level of iron was only just keeping the anemia away!

Please get a blood test to as may be a treatable cause. I was the same and kept putting off going to the GP. Went this week and I'm severely anaemic and starting treatment.

Have you/anyone here found an iron and b12 supplement that is gentle on the stomach? My ferritin, iron and b12 are low and I've spent over £100 on supplements and they all make me horribly sick.

Was your thyroid also definitely ok? Again, I believe some people can be impacted by what doctors might consider an acceptable test results.

I agree with this (the nhs saying things are fine when you're actually quite low and it can make you feel shit). I find drinking enough water makes a really big difference in my energy levels. I'm terrible for not drinking enough.

Yes, although not low enough to need a prescription they’ve advised I get supplements for both of these

Being what the NHS calls 'slightly' deficient in iron and Vitamin B (and Vit D) is enough to make you feel shattered all the time.

OP, try taking iron, vitamin D and B-complex supplements. Drink lots of water and cut out or cut back on processed sugar. If this is the issue, you should feel significantly better within a week.

How old are you and do you have children/caring responsibilities on top of your job?

Things to review:

diet
exercise/activity levels
hormones/menstruation patterns/menopause
alcohol/drug/medication usage
stress levels