summoning a thrownpotion and giving it the id for healing, AND setting it's amplifier really high can kill players in creative mode.
Please read this to learn more: http://www.reddit.com/r/redstone/comments/2mdp1p/command_til_healing_potions_can_kill_players_in/
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Amplifiers beyond 4 are not supported.

players in creative mode should not be able to die unless killed by /kill.
Please actually fix before closing it
On Sun, Nov 16, 2014 at 1:49 AM, [Mod] Kumasasa (JIRA) <[email protected]>
wrote:
> [Mod] Kumasasa
> <https://bugs.mojang.com/secure/ViewProfile.jspa?name=kumasasa> resolved
> an issue as Duplicate
>
> Amplifiers beyond 4 are not supported.
> Minecraft <https://bugs.mojang.com/browse/MC> / [image: Bug]
> <https://bugs.mojang.com/browse/MC-74368> MC-74368
> <https://bugs.mojang.com/browse/MC-74368> High Amplified Healing
> Potions can kill Players in Creative
> <https://bugs.mojang.com/browse/MC-74368> Change By: [Mod] Kumasasa
> <https://bugs.mojang.com/secure/ViewProfile.jspa?name=kumasasa>
> Resolution: Duplicate Status: Open Resolved [image: Add
> Comment] <https://bugs.mojang.com/browse/MC-74368#add-comment> Add
> Comment <https://bugs.mojang.com/browse/MC-74368#add-comment>
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Confirmed. Interestingly enough, when killed this way you won't drop anything.