# When is the best time to take whey protein?

Source: https://www.healthnews24.co.za/answers/when-to-take-whey-protein/
Publisher: Healthnews24 (South Africa's supplement answer desk)
Updated: 2026-10-27

> In South Africa as elsewhere, take whey whenever it helps you reach your daily protein target: total daily intake matters far more than timing. Aim for 20–40 g per serving across 3–5 meals about 3–4 hours apart, with one serving within a few hours of training. The 30-minute anabolic window is overstated; 30–40 g of casein before bed is optional.

Key facts:
- ISSN: total daily protein intake matters most; distribution and timing are secondary.
- Trommelen et al. (2023): 100 g of milk protein after exercise produced a longer anabolic response over 12 hours than 25 g.
- Schoenfeld & Aragon (2018): about 0.4 g/kg per meal across at least four meals reaches 1.6 g/kg a day.
- ISSN: 30–40 g of casein before sleep is a useful but optional extra.

## When is the best time to take whey protein?

Whenever it fits your day and fills a protein gap. The ISSN's nutrient-timing position stand concludes that total daily protein is the main driver of muscle gain, with distribution across meals a secondary refinement. For most South African lifters, the "best" time is the one you will repeat.

## Is there an anabolic window after training?

The window is much wider than 30 minutes, especially if you ate protein in the hours before training. Trommelen and colleagues (2023) found 100 g of milk protein after exercise produced a longer anabolic response over 12 hours than 25 g, which also undercuts the idea that the body can use only 20–30 g at once. A shake straight after training is convenient, not magic.

## How should you spread protein across the day?

Schoenfeld and Aragon (2018) suggest about 0.4 g per kg per meal across at least four meals to reach 1.6 g/kg a day; the ISSN gives about 0.25 g/kg (roughly 20–40 g) every 3–4 hours.

| Situation | Practical timing |
|---|---|
| Morning training, fasted or light breakfast | A shake within 1–2 hours after, with carbohydrate if you train hard again |
| Lunch-time or after-work training | One serving within a few hours either side; main meal as normal |
| Evening training | Post-session serving, then optional 30–40 g casein before bed |
| Cutting | Spread 25–40 g across 4 meals; powder helps with fullness |
| Older adults (anabolic resistance) | Aim for the higher end of 30–40 g per meal |
| Endurance (long run or ride) | Whey with carbohydrate after; protein supports recovery |

For example, a 75 kg lifter aiming at 1.6 g/kg needs 120 g: four meals of 30 g. One scoop of whey at roughly 23 g of protein can be one of those feeds.

## Should you take whey before bed?

Pre-sleep protein is optional. The ISSN says 30–40 g of casein before sleep raises overnight muscle protein synthesis and does not impair fat burning. Whey works too; casein just digests more slowly. See [casein vs whey](/answers/casein-vs-whey-protein-south-africa/).

## What does this cost?

At October 2026 prices a serving of whey costs roughly R12–R39 depending on brand ([per 30 g protein comparison](/answers/whey-protein-per-30g-protein-comparison-south-africa/)), so one shake a day can be sufficient if the rest comes from food. Check [how much protein per day](/answers/how-much-protein-per-day-south-africa/) and [how much protein to build muscle](/answers/how-much-protein-to-build-muscle/), and see the [best whey protein in South Africa](/best/best-whey-protein-south-africa/) for a tub.

## Who should check first?

If you have kidney disease, are pregnant or under 18, or take medicine, ask a doctor or dietitian before raising protein intake.

## Sources

- [ISSN Position Stand: Nutrient Timing (Kerksick et al., JISSN 2017)](https://doaj.org/article/8044581e83354ad88642b8124c51b956)
- [Schoenfeld & Aragon 2018, How much protein can the body use in a single meal for muscle-building? (JISSN)](https://pubmed.ncbi.nlm.nih.gov/29497353/)
- [Trommelen et al. 2023, The anabolic response to protein ingestion during recovery from exercise has no upper limit (Cell Reports Medicine)](https://pmc.ncbi.nlm.nih.gov/articles/PMC10772463/)
- [ISSN Position Stand: Protein and Exercise (Jäger et al., JISSN 2017)](https://pubmed.ncbi.nlm.nih.gov/28642676/)