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Everything you need to time your routine well.
- 60-second wizard
- Full daily timeline
- Pairing & spacing notes
- Mobile and desktop
Precision supplement timing
When is the best time to take calcium?
- When is the best time to take vitamin D? With your largest meal of the day, ideally morning. Dietary fat boosts absorption up to 32%.
- When should you take iron supplements? On an empty stomach with vitamin C, away from coffee, tea, calcium, and dairy.
- When is the best time to take magnesium? Evening, 1 to 2 hours before bed, and not in the same dose as zinc or calcium.
- When should you take zinc? With food to avoid nausea, separated from iron, calcium, and magnesium by 2+ hours.
- When is the best time to take calcium? Split doses with meals, never with iron, and away from your thyroid medication.
Split doses with meals, never with iron, and away from your thyroid medication.
Five questions. Sixty seconds. A calm daily schedule built around your stack.
No signup, no dosage advice. Backed by 120+ cited studies.
Vitamin D38:00 am
Iron + Vit C12:00 noon
Magnesium9:30 pm
00:00
scanning your day
The day sweeps by, amber to indigo. Each supplement has its moment.
OptimalNourish builds a free, personalized schedule showing when to take each of your supplements, what to pair, and what to keep apart, based on your meals and sleep. It takes about 60 seconds and gives no dosage or medical advice.
“I spent years taking nine supplements at once, with coffee, quietly sabotaging half of them.”
, Bharat Reddy, founder. Read the story
10-second check
Are two of your supplements fighting each other?
Pick any two. We tell you instantly whether to pair them, space them, or take them whenever.
Pairing explorer
See all pairings What plays nice. What doesn't.
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Space apart , 2hIron + Calcium
Calcium reduces iron absorption, space at least 2 hours apart.
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Space apart , 2hIron + Zinc
Compete for the same transporters, space at least 2 hours.
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PairIron + Vitamin C
Vitamin C boosts non-heme iron absorption when taken together.
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Space apart , 2hCalcium + Zinc
Space these minerals at least 2 hours apart.
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PairVitamin D3 + Vitamin K2
Commonly paired; both fat-soluble and complementary.
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PairVitamin D3 + Fish Oil (Omega-3)
Both fat-soluble, same meal works well.
How it works
From bottles to a one-page schedule.
STEP 01
Answer 7 quick questions
Tell us what you take, when you eat, and how you sleep. No account needed.
STEP 02
We map your timing
We slot every supplement into morning, with-food, evening, or wind-down using research-backed rules.
STEP 03
Download your plan
Get a clean one-page schedule as PDF. Pin it, print it, share it.
Timing simulator
Click a slot. See what fits there.
Every supplement has a natural home. Tap through the day to see what belongs.
97 supplements commonly placed here
Browse allSupplements catalog
Browse the full catalog 328 supplements, each with a timing rule.
Form factors
Open the form-factors lab The shape your supplement takes matters.
Capsule / Tablet
Strengths
- ● Precise dose
- ● Travel-friendly
- ● Long shelf life
Trade-offs
- ● Slower onset
- ● May be hard to swallow
Routine stacks
Browse all stacks Ready-made routines for common goals.
The scienceRead the full science
Built on what the research actually says.
Every recommendation traces back to a peer-reviewed study, professional guideline, or established chronobiology principle. No influencer takes. No supplement-brand sponsorships.
"Timing of nutrient intake is increasingly recognized as a modifiable factor in absorption and downstream physiological response."
, Adapted from chrononutrition literature
328
Supplements covered
120+
Cited studies & guidelines
5
Timing windows mapped
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Dosage claims made
What people say
Loved by people who hate complicated routines.
"I used to take everything at breakfast and felt nothing. The schedule moved magnesium to evening and now I actually sleep through the night."
"Finally a tool that doesn't try to sell me anything. Generated a PDF in under a minute and stuck it on my fridge."
"Caught that I was taking iron and calcium together. The schedule fixed it in one pass."
"I love that it stays in its lane, when to take, what to pair. No dosage drama, no fearmongering."
Why this works.
Peer-reviewed
Timing and pairing guidance grounded in published nutrition and chronobiology literature.
No dosage claims
We answer when and with what, never how much, what to treat, or what to take.
No signup
No account, no password. We email you the PDF and a re-check link.
Free to use. Pay once if you want the PDF.
No subscriptions. No upsell loops.
$4.95
One-time, no subscription.
- Branded one-page printable PDF
- Detailed pairing & interaction notes
- Weekly schedule variants
- Lifetime re-access via magic link
Free PDF, delivered to your inbox in under a minute.
Frequently asked.
Your timing plan, in 60 seconds.
Five short questions. One clear daily schedule. Free PDF, delivered to your inbox in under a minute.
Build my schedule