Does pre-workout raise blood pressure?
Yes, temporarily. The caffeine in most pre-workouts (about 150–300 mg per serving) raises blood pressure for several hours; in a meta-analysis of trials using 200–300 mg, systolic pressure rose by about 8 mmHg within an hour in hypertensive people. If you have high blood pressure, a heart-rhythm problem or take blood-pressure medication in South Africa, speak to your doctor before using one.
- 200–300 mg of caffeine raised systolic pressure about 8 mmHg and diastolic about 6 mmHg in hypertensive people (Mesas 2011 meta-analysis), lasting 3 hours or more.
- ISSN: 3–6 mg/kg caffeine is the studied range; around 9 mg/kg adds side effects without extra benefit.
- Published South African pre-workout caffeine figures range from 150 mg (Biogen Premium, USN XTS Hyperdrive) to 300 mg (USN Qhush Platinum Black, global page only; SA tub unconfirmed).
- Citrulline can add to the effects of nitrates, PDE5 inhibitors and blood-pressure medicines.
Does pre-workout raise blood pressure?
Yes, briefly. Caffeine blocks adenosine receptors and stimulates the sympathetic nervous system, which lifts heart rate and blood pressure. A 2011 meta-analysis (Mesas et al.) of trials in hypertensive people found, pooling five trials, that 200–300 mg of caffeine raised systolic pressure by about 8 mmHg and diastolic by about 6 mmHg. The rise appeared within an hour and lasted at least three hours. Healthy people may see a smaller bump, and exercise itself raises pressure too.
How much caffeine is in South African pre-workouts?
Many sellers do not publish it. As of October 2026 the figures we could find were:
| Product | Published caffeine |
|---|---|
| Biogen Premium Pre-Workout | 150 mg per serving (Biogen article) |
| USN XTS Hyperdrive | 150 mg headline figure; serving basis not stated |
| Cellucor C4 Original | 200 mg per scoop (US brand page) |
| USN Qhush Platinum Black | 300 mg per serving on USN's global page; not confirmed for the South African tub |
| NPL Blackout, Evox Alpha Surge, Biogen Rampage | Caffeine listed, mg not published |
A 2026 South African Medical Journal letter from UCT clinical pharmacologists raises concern about caffeine-containing pre-workouts, which is one more reason to know your number.
What else in a pre-workout affects blood pressure?
- Citrulline malate can add to the pressure-lowering effect of nitrates, PDE5 inhibitors such as sildenafil, and antihypertensives. This is relevant if you take those medicines. Details in citrulline malate dose for pumps.
- Other stimulants such as synephrine (bitter orange) and DMAA are classed by the AIS as high-risk, Group D ingredients. See is DMAA banned in South Africa.
- Stacking: coffee, energy drinks and fat burners add to the same load.
How can you lower the risk?
- Pick a product that prints caffeine in mg, and keep the total near 3 mg/kg (210 mg for 70 kg) rather than 6.
- Start with half a scoop. The Dis-Chem page for Biogen Rage Rampage suggests this for stimulant-sensitive users.
- Avoid taking it within about six hours of bed; see pre-workout and sleep.
- Use a stimulant-free product if you are sensitive, such as USN Qhush Hyperdrive Caffeine Free.
When should you see a doctor?
Do not use a stimulant pre-workout without medical advice if you have hypertension, a heart-rhythm problem, kidney disease or an anxiety disorder, take regular medication, or are pregnant. Under-18s should avoid high-dose stimulant products. Stop and seek help for chest pain, a racing or irregular heartbeat, severe headache or fainting. Pre-workout is a performance product, not a treatment, and it does not replace blood-pressure care.
Products mentioned, with dated prices
| Product | Size | Price | Servings | R per serving | Sweeteners |
|---|---|---|---|---|---|
| Biogen Premium Pre-Workout 600 g | 600 g | R399.99-R429.99Dis-Chem Living Fit, Oct 2026 | — | — | not stated |
| USN XTS Hyperdrive Pre-Workout 210 g | 210 g | R214-R232.99USN online shop, Oct 2026 | — | R5.40 | not stated |
| USN Qhush Hyperdrive Caffeine Free 234 g | 234 g | R309.95-R349.99USN online shop, Oct 2026 | — | — | not stated |
| Cellucor (C4) Cellucor C4 Original Pre-Workout 195 g | 195 g | R699-R752.99Dis-Chem Living Fit, Oct 2026 | 30 | R25.10 | Sucralose and acesulfame potassium |
Compare the options
Related questions
- How much caffeine is in pre-workout in South Africa?
- Is pre-workout safe? What do South African doctors say?
- Why does pre-workout cause heart palpitations or anxiety?
- What is the best stimulant-free pre-workout in South Africa?
- How long before bed should you stop pre-workout?
Sources
- Guest NS et al. (2021) ISSN position stand: caffeine and exercise performance. JISSN
- Mesas AE et al. (2011) The effect of coffee on blood pressure and cardiovascular disease in hypertensive individuals: systematic review and meta-analysis. Am J Clin Nutr
- Gough LA et al. (2021) A critical review of citrulline malate supplementation and exercise performance. Eur J Appl Physiol
- SAMJ (2026) correspondence from UCT clinical pharmacology on caffeine-containing pre-workout supplements
Educational information only, not medical advice. Speak to a doctor, pharmacist or registered dietitian before using supplements if you are pregnant or breastfeeding, under 18, taking medication, or living with kidney, liver or heart disease.
Cite this page: Healthnews24, “Does pre-workout raise blood pressure?”, updated 27 October 2026, https://www.healthnews24.co.za/answers/pre-workout-and-blood-pressure/. Plain-text version: /answers/pre-workout-and-blood-pressure.md