Do Multivitamins Expire and Are They Still Safe to Take

I just found a bottle of multivitamins in the back of my cupboard that expired about six months ago. They look fine and they do not smell strange but I am not sure if I should still take them. I do not want to waste them but I also do not want to get sick or take something that has lost all its potency.

Do vitamins actually go bad or do they just become less effective over time? I am in Canada and it is a high quality brand from the pharmacy. I am wondering if the minerals like zinc and magnesium are more stable than the vitamins like C and D.

Has anyone here taken expired supplements before? I would love to know if there are any risks I should be aware of. I am trying to stay healthy on a budget and I would hate to throw away a full bottle if it is still safe to use.

I've been in that exact spot, mate. Generally, they don't become "toxic" after six months, but the potency starts to drop off. The water-soluble vitamins like B and C are the first to lose their punch. If they aren't discoloured or smelling like old gym socks, they're likely safe but just less effective.

Totally agree with LondonLad. Most of those expiration dates are just "best by" dates mandated by the FDA for shelf life. As long as you kept them in a cool, dry place and not in a humid bathroom cabinet, you should be fine to finish the bottle.

I actually asked my pharmacist about this once. He said the biggest risk isn't getting sick, it's just wasting your time taking something that doesn't work anymore. Six months isn't a huge deal, but I wouldn't push it to two years or anything crazy.

I'm a bit more cautious. If the seal was already broken, moisture from the air can get in there and cause oxidation. In Canada, we get some pretty dry winters, but if you're somewhere humid, I'd probably just toss 'em and buy a fresh pack of multivits.

Are they tablets or those liquid gel capsules? I find the gel caps go rancid much faster than the dry tablets. If they're sticky or have a weird oily sheen, definitely bin them.

Quick question for the group—does the same rule apply to fish oil? I found some old Omega-3s and they smell quite "fishy" but I can't tell if that's just how they are.

No! Fish oil is a completely different beast. If it smells rancid, it IS rancid. Oxidised fats are actually inflammatory, which is the opposite of why we take them. Throw those out immediately.

Listen to LondonLad. Rancid fish oil is nasty. For the multivitamins though, check for dark spots. If you see little black or brown speckles that weren't there before, that's mold or severe oxidation. That’s a hard pass.

What about the "vinegar" smell? I’ve had some B-complex vitamins that smelled like a chip shop in London from the day I opened them. Is that normal?

Haha! Yeah, B vitamins, especially B1 (Thiamine), naturally have a pretty pungent, slightly sulphuric smell. It’s not pleasant but it’s normal. If it changes to a sour vinegar smell though, that’s different.

Thanks for the info! They are dry tablets, no spots, and they don't smell weird. I think I'll keep taking them until I can get to the shops this weekend. No point in wasting money if they're 90% effective.

Smart move. I read a study once about the US military testing medications—most were fine for years past the date. Obviously supplements aren't strictly regulated the same way, but the chemistry is similar.

Just don't expect them to cure a deficiency if you actually have one. If you're using them as a "safety net" for a decent diet, six months is fine. If you're clinically low on Vitamin D, get the fresh stuff.

Does the type of packaging matter? Like, are the ones in dark glass bottles better than the cheap plastic ones for shelf life?

Glass is generally better because it's less permeable to oxygen. But most vitamins come with that little silica packet inside—don't throw that away! It's there to keep the moisture down.

I always throw that packet away immediately. Is that bad?

Yeah, leave it in! Especially in humid places. It keeps your tablets from crumbling or getting that sticky texture.

One thing to watch out for with old vitamins is the coating. If the outer shell is cracking, the inside is exposed to air. If they're smooth, you're good to go.

Good shout, London. I’ve noticed the "natural" brands with fewer binders tend to fall apart faster than the big commercial ones like Centrum.