When to Take Your Supplements
Timing matters. Taking the right supplement at the wrong time can slash absorption by half or wreck your sleep. This guide breaks down exactly when to take every common supplement for maximum benefit.
Consult a healthcare professional before starting any new supplement regimen.
Morning (on an empty stomach or with breakfast)
Fat-soluble vitamins absorb best with the fats in your breakfast. B vitamins and iron are best taken early because they can be energising and may disrupt sleep if taken late.
| Supplement | Dose | Notes |
|---|---|---|
| Vitamin D3 | 2,000-4,000 IU | Take with a meal containing fat for best absorption. |
| B-Complex | As directed | Energising. Avoid taking in the evening. |
| Iron | 14-18 mg (women), 8 mg (men) | Take on an empty stomach with vitamin C. Avoid with calcium. |
| Vitamin C | 500-1,000 mg | Enhances iron absorption. Safe at any time. |
With Meals
Fat-soluble vitamins (A, D, E, K) and fish oil need dietary fat to be absorbed properly. Taking them with meals also reduces stomach upset.
| Supplement | Dose | Notes |
|---|---|---|
| Fish Oil / Omega-3 | 1,000-3,000 mg EPA+DHA | Take with your fattiest meal to reduce fishy burps. |
| Multivitamin | As directed | Contains fat-soluble vitamins. Always with food. |
| Vitamin E | 15 mg (22 IU) | Fat-soluble. Take with a meal. |
| Vitamin K2 | 100-200 mcg | Works synergistically with vitamin D. Take together. |
| Coenzyme Q10 | 100-200 mg | Fat-soluble. Absorption doubles with food. |
Evening (before bed)
Magnesium and zinc support recovery and sleep quality. Melatonin should only be used occasionally for jet lag or shift work.
| Supplement | Dose | Notes |
|---|---|---|
| Magnesium Glycinate | 200-400 mg | Promotes relaxation. Glycinate form is gentle on the stomach. |
| Zinc | 15-30 mg | Supports immune function and testosterone. Take with food to avoid nausea. |
| Melatonin | 0.5-3 mg | Take 30-60 minutes before bed. Start with the lowest dose. |
| Ashwagandha | 300-600 mg | Adaptogen. Evening dosing may improve sleep quality. |
Pre-Workout (30-60 minutes before)
These supplements improve performance when taken shortly before training. Caffeine peaks at about 45 minutes.
| Supplement | Dose | Notes |
|---|---|---|
| Caffeine | 100-200 mg | Peaks at 45 minutes. Avoid after 2pm if it affects your sleep. |
| Creatine Monohydrate | 3-5 g | Timing is flexible, but pre-workout is convenient. |
| Beta-Alanine | 3.2-6.4 g | May cause harmless tingling (paraesthesia). Split dose if needed. |
| Citrulline Malate | 6-8 g | Improves blood flow and endurance. Take on an empty stomach. |
Post-Workout (within 60 minutes)
The post-workout window is ideal for protein synthesis and recovery. Pair protein with carbohydrates for best results.
| Supplement | Dose | Notes |
|---|---|---|
| Whey Protein | 20-40 g | Fast-digesting. Mix with water or milk. |
| Glutamine | 5-10 g | Supports gut health and recovery. Mix into your shake. |
| BCAAs | 5-10 g | Unnecessary if you are already using whey protein. |
| Electrolytes | As directed | Replace sodium, potassium and magnesium lost through sweat. |
Key Rules
- Fat-soluble vitamins (A, D, E, K) always need dietary fat to absorb properly.
- Iron and calcium compete for absorption. Never take them at the same time.
- Caffeine blocks iron absorption. Separate coffee and iron supplements by at least 2 hours.
- Consistency matters more than perfection. Taking a supplement at the wrong time is still better than skipping it entirely.