Which supplements last the longest?

“Solid forms, such as tablets and capsules, are the most stable past their expiration date. Supplements that exist in solution or as a reconstituted suspension (powder mixed with water) are less likely to be potent if used when outdated,” explains Dr Zafar.

Registered nutritionist and Nutritionist Resource member Amie Parry-Jones says: “Oils such as fish oil and flaxseed oil benefit from refrigeration to slow oxidation. While they may last for a few years unopened, it’s important to remember that once a seal is broken on some products, they don’t last more than a few weeks. For this reason, capsules containing oils are a more practical solution for people.

“This is also the case with freshly ground flaxseed. Once the seeds are broken down and the oils within are exposed to environmental influences, they can go rancid quite quickly.”

Parry-Jones also notes that even if a supplement remains safe to ingest after its ‘best before’ date, it could be indirectly harmful. “For example, if you’re taking B12 for a deficiency, an expired supplement – depending on how old it is – won’t be likely to increase B12 levels as effectively, which impacts symptom alleviation. Another important example is folic acid in pregnancy supplements,” she explains.

How to store your supplements properly to prolong their lifespan, according to experts