When to take each supplement for maximum effect
Timing changes how well most supplements work — sometimes dramatically. Iron absorbs three times better on an empty stomach. Fat-soluble vitamins need dietary fat or you're excreting half the dose. And some combinations actively compete with each other. This page walks through the timing rules that actually matter.
The short list
A fat-soluble vitamin essential for bone health and immune function.
An essential mineral for oxygen transport and energy production.
A highly absorbable form of magnesium bound to glycine.
The most abundant mineral in the body, critical for bones and muscle function.
An essential mineral supporting immune function and enzyme activity.
A group of eight water-soluble vitamins essential for energy metabolism.
Essential fats (EPA/DHA) that support cardiovascular and brain health.
A hormone that regulates sleep-wake cycles.
Frequently asked
- Can I take vitamin D and calcium at the same time?
- Yes — vitamin D actually improves calcium absorption. The pair that fights is calcium + iron: calcium blocks iron absorption significantly, so separate those by at least 2 hours.
- Should I take magnesium in the morning or evening?
- Evening, for most people. Magnesium glycinate supports nervous-system calming and sleep, so bedtime timing uses that property. Magnesium citrate can be any time — it's used for regularity, not sedation.
- Do I really need to take iron on an empty stomach?
- If you can tolerate it, yes. Absorption is 2–3× higher without food. If iron gives you nausea (common), take it with a little vitamin C — that partially rescues absorption while buffering the stomach.
- What supplements should never be taken together?
- Calcium blocks iron, zinc, and magnesium. Zinc and copper compete. Thyroid medication needs to be separated from almost everything — take it 30–60 minutes before food or other supplements.
- Can I take all my supplements at once?
- Usually yes, with food — but you'll get better absorption from iron, thyroid medication, and empty-stomach peptides if you separate them. The trade-off is adherence: one morning stack you actually take beats a perfect schedule you skip.
Not sure where to start?
Take the 2-minute quiz. We'll assemble your stack from the compounds on this page that actually match your goals, diet, and what you're already taking.
Build my plan