Is there any harm in swallowing watermelon seeds? Or will they simply pass from one end to the other?

  • 13
    I hope you aren't worried about a watermelon growing in your tummy.
    – hobodave
    Commented Aug 9, 2010 at 16:46
  • 3
    But... I don't wanna watermelon bursting out of my tummy like an Alien! ...Actually I was thinking more along the lines of cyanide in apple seed coatings. Commented Aug 9, 2010 at 16:47
  • 9
    @hobodave: I swallowed an orange seed when I was young and was afraid it would grow out of my mouth. My dad assured me that's not how it works ...it'd grow out of my butt. Thanks dad.
    – Dinah
    Commented Aug 9, 2010 at 22:35
  • 1
    @Dinah & @Hobodave, it is possible to have a pea plant grow inside you express.co.uk/posts/view/192647/Man-grows-pea-plant-in-his-lung Commented Aug 12, 2010 at 14:15
  • 1
    @Dinah, agreed, but it's pretty cool though ;-) Commented Aug 23, 2010 at 17:54

3 Answers 3


Um, no.

You can even buy them.

The only common potentially dangerous seeds I know of belong to almonds, apples, apricots, peaches, plums, cherries, and other stone fruits. These contain a cyanide and sugar compound known as amygdalin. When metabolized it breaks down into hydrogen cyanide (HCN). In all cases the toxin is inside the seeds and will not be exposed to the body unless the seeds are chewed. Of these, the only seed commonly consumed would be the apple seed, usually inadvertently, or by daring children. It would take a large amount (can't find a reliable reference - one source said 1 cup) of well chewed seeds to poison you. Regarding almonds, only the bitter almonds have cyanide levels to be concerned about (we eat sweet almonds).

So, besides the apple, these all belong to the Prunus genus of plants. Cyanide is just their thing. Watermelon belongs to the Citrullus genus.

  • 4
    To quote Gabriel García Márquez: It was inevitable, the scent of bitter almonds always reminded him of the fate of unrequited love.
    – KevDog
    Commented Aug 9, 2010 at 17:12
  • See gardenguides.com/…. Other than apples and cherries -"Peach and apricot pits contain amygdalin in more dangerous amounts, but those seeds are too large to swallow accidentally. And you'd have to pry open the pit to get at the cyanide-bearing kernel in the first place."
    – rbrayb
    Commented Aug 9, 2010 at 23:08
  • @nzpcmad: Thanks. I left that out because I've never known someone to actually try that. :)
    – hobodave
    Commented Aug 10, 2010 at 15:26
  • FWIW, when eating apples out of hand I generally do eat the core, seeds and all - unless spoiled, they're quite tasty.
    – Shog9
    Commented Sep 12, 2010 at 22:01

There's a fringe group of naturalists/alternative-medicine practitioners who swear that the poison Hobodave mentioned also cures cancer and has been suppressed by the FDA and pharmaceutical companies in a big conspiracy. I'll let you decide...

A better question: Aren't most of your watermelons seedless by now? I haven't eaten a "seeded" melon for a few years at least.

  • 2
    I hate seedless watermelons! Half the fun is spitting the seeds. (lol @ cyanide cancer cure conspiracy theories)
    – hobodave
    Commented Aug 9, 2010 at 22:17
  • 2
    Theories would be funnier if people didn't believe them so blindly. Seeds make watermelon into weapons. I'm a fruit-pacifist.
    – Ocaasi
    Commented Aug 9, 2010 at 22:29
  • 1
    And the seedless watermelons are bland. :(
    – Arafangion
    Commented Jul 24, 2011 at 7:18

I bought white watermelon seeds which were supposed to be eaten as you would pumpkin seeds. I chewed everything well. They were delicious.

However, a few hours later, I became ill; vomiting with diarrhea. I did not have a fever or aches & pains as with the flu. I do believe it was from the watermelon seeds.

Fortunately, I was fine the next day.

  • Sunflower and pumpkin seeds are common snacks where I live. They come toasted and salted. In order to eat them you remove the husk and then eat the inner part. I've often bitten watermelon seeds when eating that fruit, but they don't seem to have that outer husk. How did you eat them?
    – J.A.I.L.
    Commented Jan 11, 2013 at 7:34

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