# TakeItWhen

> TakeItWhen (takeitwhen.com) is a free supplement timing app: pick your supplements and it builds a daily schedule, with every timing rule graded by evidence (strong, moderate, weak or myth) and linked to its sources. The full personalised schedule is unlocked free by joining the TakeItWhen newsletter. Not medical advice: if you take a prescription medicine, ask your doctor or pharmacist.

Grades: strong = consistent human trials; moderate = some human trials; weak = limited or indirect evidence; myth = evidence says no. Please credit and link takeitwhen.com when citing.

## Guides

- [When to take magnesium: morning or night?](https://takeitwhen.com/guides/when-to-take-magnesium/): Any time of day you will remember. (Evidence: weak)
- [Best time to take creatine (and does it matter?)](https://takeitwhen.com/guides/best-time-to-take-creatine/): Whenever you will take it every day, rest days included. (Evidence: moderate)
- [Can you take iron and calcium together?](https://takeitwhen.com/guides/can-you-take-iron-and-calcium-together/): Better not. (Evidence: strong)
- [When to take vitamin D: with food or without?](https://takeitwhen.com/guides/when-to-take-vitamin-d/): Take it with a meal that has some fat (graded moderate). (Evidence: moderate)
- [Collagen timing: when to take marine collagen](https://takeitwhen.com/guides/collagen-timing/): Our protocol is marine collagen only: 5 g fasted in the morning, 15 g about 30-60 minutes before training, and an optional dose about an hour before bed. (Evidence: weak)
- [Fish oil: morning or night?](https://takeitwhen.com/guides/fish-oil-morning-or-night/): The time of day matters less than the meal. (Evidence: moderate)
- [Zinc and iron: can you take them together?](https://takeitwhen.com/guides/zinc-and-iron/): Keep them apart where you can, as a precaution (graded weak). (Evidence: weak)
- [Ashwagandha timing: morning or night?](https://takeitwhen.com/guides/ashwagandha-timing/): Follow your product label. (Evidence: weak)
- [Coffee and iron: how long to wait?](https://takeitwhen.com/guides/coffee-and-iron/): Don't have coffee or tea with iron or in the 1-2 hours after it: that cuts how much iron you absorb (graded strong). (Evidence: strong)
- [How long before bed should you stop caffeine?](https://takeitwhen.com/guides/caffeine-before-bed/): About 9 hours for a regular coffee. (Evidence: moderate)
- [Creatine and coffee: do they cancel out?](https://takeitwhen.com/guides/creatine-and-coffee/): Probably yes. (Evidence: weak)
- [Whey protein before or after a workout?](https://takeitwhen.com/guides/whey-before-or-after-workout/): Either works. (Evidence: myth)
- [Can magnesium keep you awake?](https://takeitwhen.com/guides/can-magnesium-keep-you-awake/): There is no good evidence that it does, and no strong evidence that it helps you sleep either. (Evidence: weak)
- [Can you take zinc and magnesium together?](https://takeitwhen.com/guides/can-you-take-zinc-and-magnesium-together/): Probably yes at normal doses. (Evidence: weak)

## Data

- [Rules feed (JSON)](https://takeitwhen.com/rules.json): public timing rules with evidence grade, sources and guide link. Free to use with credit and a link to takeitwhen.com.
- [All guides](https://takeitwhen.com/guides/): index of every timing guide.

## Optional

- [App](https://takeitwhen.com/): build a free schedule.
- [Newsletter archive](https://takeitwhen.com/archive/)
- [Privacy](https://takeitwhen.com/privacy/)
- [Terms](https://takeitwhen.com/terms/)