# Is pre-workout safe? What do South African doctors say?

Source: https://www.healthnews24.co.za/answers/is-pre-workout-safe-south-africa/
Publisher: Healthnews24 (South Africa's supplement answer desk)
Updated: 2026-10-27

> For most healthy adults, a pre-workout taken at the label dose is low risk, but the risk rises with caffeine stacking, hidden ingredients and pre-existing conditions. A 2026 South African Medical Journal letter from University of Cape Town clinical pharmacologists is titled as raising concerns about toxicity from caffeine-containing pre-workouts. Under-18s, pregnant women and people with heart or blood pressure problems should avoid it.

Key facts:
- A 2026 SAMJ letter from UCT clinical pharmacologists is titled 'Concerns regarding toxicity associated with caffeine-containing pre-workout supplements'.
- EFSA: up to 400 mg of caffeine a day and 200 mg at once is safe for healthy adults; 200 mg a day in pregnancy.
- Duiven 2021: 38% of 66 muscle, fat-loss and energy supplements had undeclared doping substances.
- Published caffeine for pre-workouts sold in SA ranges from 150 mg to 300 mg a scoop (the 200 mg and 300 mg figures come from US or global brand pages); several brands publish no figure.
- Under-18s, pregnant women and people with heart or blood pressure problems should avoid pre-workout.

## Is pre-workout safe?

For a healthy adult who takes a transparent product at the label dose, the main risk is too much caffeine, and the effects (racing heart, jitters, nausea, poor sleep) are usually short-lived. The concerns are real, though, and they get worse when people double scoop, mix products or train in the heat.

## What are South African doctors saying?

A July 2026 correspondence in the South African Medical Journal from the University of Cape Town's Division of Clinical Pharmacology is titled "Concerns regarding toxicity associated with caffeine-containing pre-workout supplements". We could read only the title and keywords, so we attribute nothing else to it; read the original for its content. The direction is consistent with the wider evidence: caffeine is the active ingredient in most pre-workouts, and in some products the amount is not even stated.

## Where does the risk come from?

1. **Caffeine dose.** Published doses for tubs sold in SA range from 150 to 300 mg a scoop (300 mg from a global, non-SA page); several brands do not publish a figure. EFSA found up to 400 mg a day and single doses up to 200 mg raise no safety concern for healthy adults. Side effects rise with dose, and about 9 mg/kg adds side effects without benefit.
2. **Stacking.** A scoop plus coffee, an energy drink and a fat burner can total more than 500 mg.
3. **Hidden or banned stimulants.** A Dutch study found 38% of 66 products marketed for muscle gain, fat loss or energy contained undeclared doping substances, including stimulants such as DMAA. See [is DMAA banned](/answers/is-dmaa-banned-in-south-africa/).
4. **Proprietary blends.** If the dose is hidden, you cannot judge it.
5. **Other ingredients.** Citrulline can add to the blood-pressure-lowering effect of antihypertensive medicines and PDE5 inhibitors. Beta-alanine causes harmless tingling.
6. **Heat and dehydration.** SA summer training adds strain.

## Who should avoid pre-workout?

- Under-18s (avoid high-dose stimulant products)
- Pregnant and breastfeeding women (pregnancy limit is 200 mg of total caffeine a day)
- Anyone with heart rhythm problems, high blood pressure, anxiety disorders or sleep problems
- People on antidepressants, stimulant medicines or blood pressure drugs
- Drug-tested athletes using unverified products

## How do you lower the risk?

- Choose a product that publishes caffeine and all doses. Biogen Premium (150 mg) does; some NPL and Evox pages do not.
- Prefer a batch-tested product if you are tested. Biogen and USN XTS Hyperdrive state testing (Informed Sport and Informed Choice respectively; both seller claims we did not verify).
- Start at half a scoop.
- Never dry scoop. See [what dry scooping is](/answers/what-is-dry-scooping-and-is-it-dangerous/).
- Stop caffeine 8–10 hours before bed.
- Consider stimulant-free options such as USN Qhush Hyperdrive Caffeine Free (R309.95–R349.99, October 2026) or a DIY stack of citrulline and beta-alanine.

## What does the label law cover?

In South Africa, supplements are generally sold as foodstuffs or, if they are amino-acid or health-supplement products, as unregistered complementary medicines that SAHPRA has not evaluated; Dis-Chem pages for single aminos carry that wording. The regulatory framework for health supplements is still in transition. In practice, no regulator has checked the product's safety before it reaches the shelf.

## When should you see a doctor?

Stop and seek care for chest pain, fainting, a very fast or irregular heartbeat that does not settle, severe anxiety, vomiting, confusion or seizures. In an emergency call 10177 or 112.

Further reading: [how much caffeine is in pre-workouts](/answers/how-much-caffeine-in-pre-workout-south-africa/) and [pre-workout heart palpitations](/answers/pre-workout-heart-palpitations-anxiety/).

## Products mentioned

| Product | Size | Price (source, date) | Servings | R per serving | Sweeteners |
|---|---|---|---|---|---|
| Biogen Premium Pre-Workout 600 g | 600 g | R399.99-R429.99 (Dis-Chem Living Fit, 2026-10) | — | — | not stated |
| USN XTS Hyperdrive Pre-Workout 210 g | 210 g | R214-R232.99 (USN online shop, 2026-10) | — | R5.40 | not stated |
| USN Qhush Hyperdrive Caffeine Free 234 g | 234 g | R309.95-R349.99 (USN online shop, 2026-10) | — | — | not stated |

## Sources

- [Taylor, Tatz, Madikizela & Blockman (2026), Concerns regarding toxicity associated with caffeine-containing pre-workout supplements (SAMJ 116(6), correspondence; title only read)](https://samajournals.co.za/index.php/samj/article/view/5186)
- [Guest NS et al. (2021) ISSN position stand: caffeine and exercise performance. JISSN](https://jissn.biomedcentral.com/articles/10.1186/s12970-020-00383-4)
- [NutraIngredients (Apr 2015): EFSA adopts caffeine opinion](https://www.nutraingredients.com/Article/2015/04/28/efsa-adopts-caffeine-opinion)
- [Duiven E et al. (2021) Undeclared doping substances are highly prevalent in commercial sports nutrition supplements. J Sports Sci Med 20:328](https://jssm.org/jssm-20-328.xml-abst)
- [Maughan RJ et al. (2018) IOC consensus statement: dietary supplements and the high-performance athlete. BJSM 52:439](https://bjsm.bmj.com/content/52/7/439.abstract)
- [EFSA (2015): Scientific opinion on the safety of caffeine, topic page](https://www.efsa.europa.eu/en/topics/topic/caffeine)