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Fifty and beyond

What changes after fifty, and what to do about it.

Three things shift measurably with age — B12 absorption, vitamin D synthesis and muscle mass. Here is what that means, what covers it, and the question to ask your pharmacist first.

What changesB12Bone & muscleProteinMedication
01

After about fifty

What changes

The food does not change. How much of it you absorb does.

Three things shift with age and they are the reason a standard multivitamin stops being the right answer. Stomach acid falls, which affects B12. Skin synthesises less vitamin D from the same sunlight. And muscle mass declines steadily unless something is done about it.

What this is not

This is not about slowing ageing, and anyone selling you that is selling you a story. It is about covering three specific things that measurably change.

Worth knowing

If you take prescription medication, this is the section that matters most. Skip to interactions below before you buy anything.

02

The absorption problem

B12

You can eat the same and absorb less.

B12 absorption depends on stomach acid and intrinsic factor, both of which decline with age. This is why Sustain carries 250 µg rather than the 100 µg in Essential Daily — not because older adults need more B12 in the bloodstream, but because less of what you swallow gets there.

AmountNutrientWhy
250 µgVitamin B12 (methylcobalamin)Contributes to normal energy-yielding metabolism, to normal psychological function and to the reduction of tiredness and fatigue.
2 mgVitamin B6 (P-5-P)Contributes to normal psychological function.

What to avoid

Cyanocobalamin, the cheaper form, which has to be converted before the body can use it.

Worth knowing

If you eat little or no meat, this matters more again. Persistent tiredness is worth a blood test rather than a guess — ask your GP.

03

The part that compounds

Bone & muscle

Vitamin D and magnesium, for the same reason.

Skin produces less vitamin D with age from identical sun exposure, and the UK barely produces any between October and March regardless. Vitamin D and magnesium both contribute to the maintenance of normal bones, and both contribute to normal muscle function.

AmountNutrientWhy
25 µgVitamin D3 (lichen-derived)Contributes to the maintenance of normal bones and to normal muscle function.
250 mgMagnesium bisglycinateContributes to normal muscle function and the maintenance of normal bones.
15 mgZinc picolinateContributes to normal immune function and normal cognitive function.

What to avoid

High-dose vitamin D bought without testing. More is not better, and the UK safe upper limit is there for a reason.

Worth knowing

The NHS suggests everyone considers a vitamin D supplement from October to March. For some people it is worth taking year round — worth asking your GP.

04

The unglamorous one

Protein

The most useful thing after fifty is not a vitamin.

Muscle mass declines with age, and the two things that reliably slow it are resistance training and eating enough protein. Neither is a supplement. If you want one thing from this page to act on, it is that — and it costs nothing.

Be sceptical of

Anything sold as a muscle preserver that is not protein or creatine. The evidence for the rest is thin.

Worth knowing

Creatine is not only for young athletes — it is one of the better-evidenced options for maintaining muscle with age, alongside resistance training.

05

Read this one

Medication

This is the section most brands leave out.

Supplement and drug interactions are real, specific, and not something a website can assess for you. Vitamin K affects warfarin. Magnesium can affect the absorption of some antibiotics. Calcium affects thyroid medication. None of this means do not take anything — it means ask someone who can see your prescription.

What to do

Take the product label, or a photo of it, to your GP or pharmacist before you start. A pharmacist will check it in under a minute and it is free.

Worth knowing

If you are on anticoagulants, blood pressure medication, thyroid medication or antibiotics, have that conversation first rather than after.

Before you buy anything

The free advice is better than the paid advice.

Ask your pharmacist

Take the label in. They will check it against your prescription in a minute, and it costs nothing.

Train against it

Resistance training does more for muscle mass after fifty than any supplement on this page.

Test, don't guess

Persistent tiredness is worth a blood test. B12 and vitamin D are both easy to measure.

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