Product guide · Restricted substance

Brawn Respawn 90 caps

Prohormone product from Brawn Nutrition, 90 capsules. This guide sets out what the manufacturer states about the composition of Brawn Respawn 90 caps, what independent research says about its main ingredients, and the safety and regulatory points that apply. It contains substances that are not authorised as food or medicine in the EU. This guide is educational: it does not recommend use and gives no directions for use.

Educational guide · Sources checked 4 November 2026 · 6 references

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Named ingredients: 2
Amounts stated: All
Status: Restricted substance
Evidence summaries: 1

Overview

Manufacturer information

Ingredients & composition

Manufacturer information

Ingredient	Amount
Estra-4,9-diene-3,17-dione	30 mg
2a,3a-epithio-17a-methyl-5a-androstan-17b-ol (Epistane)	10 mg

Scientific background

Independent research

Prohormones and designer anabolic steroids

Prohormones and "designer steroids" are synthetic anabolic-androgenic steroids, or precursors converted to them in the body, sold in supplement-style products. Examples include methasterone ("Superdrol"), methylepitiostanol ("Epistane") and trendione ("Trenavar").

Research evidence

Independent research

Prohormones and designer anabolic steroids

No controlled trials support the safety of these products. Their muscle-building effect derives from anabolic-androgenic steroid activity, the same mechanism as controlled steroid drugs.

Evidence limitations

Independent research

No published study has tested this specific product; the research summarised here concerns the ingredient itself.

Prohormones and designer anabolic steroids

Products are often mislabelled or adulterated, so the actual steroid and dose are uncertain¹².

Safety & potential risks

Independent research

Prohormones and designer anabolic steroids

Case reports describe drug-induced liver injury, including cholestasis, from prohormone and bodybuilding supplements containing anabolic-androgenic steroids¹²³. Anabolic steroids also suppress natural testosterone production and adversely affect blood lipids and the heart.

Regulatory status

GIGACULT product information

Contains synthetic anabolic-androgenic steroid compounds or prohormones. These are not authorised as food (including food supplements) or as medicinal products in the EU and are on the WADA Prohibited List. No dosing information for human use is provided.

Regulation and sport

Prohormones and designer anabolic steroids

Anabolic-androgenic steroids are medicinal substances and are not permitted in food or food supplements in the EU⁴⁵. Anabolic agents are prohibited at all times by the World Anti-Doping Agency⁶.

Scientific references

Magee CD, Witte S, Kwok RM, Deuster PA. Mission compromised? Drug-induced liver injury from prohormone supplements containing anabolic-androgenic steroids in two deployed U.S. service members. Mil Med. 2016;181:e1169-e1171. PubMed 27612377
Matusak M, Aljabban J, Wirtz M, et al. Cholestasis linked to bodybuilding supplements: exploring the risks of contamination. Case Reports Hepatol. 2024;2024:5112461. PubMed 38826497
Nash E, Nicoll A, Batt N, et al. Drug-induced liver injury from selective androgen receptor modulators, anabolic-androgenic steroids and bodybuilding supplements in Australia. Aliment Pharmacol Ther. 2024;59:953-961. PubMed 38372012
Directive 2001/83/EC on the Community code relating to medicinal products for human use. Official Journal of the European Union. Source
Regulation (EU) 2015/2283 on novel foods. Official Journal of the European Union. Source
World Anti-Doping Agency. The Prohibited List (current edition). Source

Sources checked against PubMed, Crossref or the official publisher on 2026-11-04. Manufacturer information is taken from the product's own data and has not been independently tested.

The product