Tribolin: Complete steroid profile

Chemical Profile

  • Components: Nandrolone phenylpropionate + Methylandrostenediol Dipropionate (methandriol), available under trade names such as Libriol, Tribolin, and Anabolic NA.
  • Formulas: The base formula is C18H26O2, with esters like phenylpropionate (C9H10O2), decanoate, or cypionate, adding to the compound's complexity.
  • Molecular Weight: The base molecular weight is 274.4022, with a melting point of 122-124°C.
  • Manufactured by: RWR.
  • Dosage: Recommended dosages for men range from 200-400mg per week, equivalent to about 2mg per lb of body weight, whereas for women, it is suggested between 50-100mg per week.
  • Active Life: Approximately 15 days.
  • Detection Time: Tribolin can be detected up to 18 months after usage.
  • Anabolic/Androgenic Ratio: 125/37, indicating a favorable balance towards anabolic effects.


Tribolin, sometimes referred to as Tribolin 75, is a mild combination of nandrolone and methandriol that is specifically designed for use in veterinary medicine. This molecule has a total steroid content of 75 mg/ml, comprised of 40 mg/ml of methandriol dipropionate and 35 mg/ml of nandrolone decanoate. Usually, multi-dose vials containing 10 and 20 mg/ml are available. The same producer, Ranvet Company, also produces Filybol Forte, a slightly different variation with a nandrolone content adjustment and a total 70 mg/ml concentration. The nature of Libriol, an unusual mix of anabolic steroids from Australia, has drawn attention from the bodybuilding community. It consists of a small amount of methandriol and nandrolone together. 

Due to its versatility and ability to assist users in both gaining quality muscle and losing fat, the former is one of the most well-liked steroids among users.

Benefits of Tribolin

1- Nandrolone

1- Testosterone

One of its advantages is that it is one of the safest steroids available and is based on testosterone. Since nandrolone is less androgenic and more anabolic, female users are less likely to appear like men when using it. Because it includes nandrolone, which helps to boost the quantity of nitrogen and proteins in the muscles, libriol is a powerhouse for individuals looking to pack on muscle. The user's endurance is increased because the nitrogen in their muscles makes more red blood cells.

2- Fast recovery

After working out, users of steroids containing nandrolone recover even faster and do not tire as quickly.

3- Help lose weight

Steroids containing nandrolone help people lose weight for health and appearance by causing the body to store less fat and more muscle. They also make the user more aggressive, which aids in improving his performance in whatever sport he participates in. Since nandrolone aromatizes at a rate of 20%, male users shouldn't be concerned about developing feminine features like breasts or gynecomastia.

4-  No virilization symptoms 

There is no acne, loss of hair, or virilization symptoms in women unless used for longer than prescribed.  The side effects of nandrolone include the reduction of testosterone in the body due to the artificial supply of testosterone by nandrolone. This can cause loss of sex drive and, in some cases, impotence.

2- Methylandrostenediol Dipropionate (Methandriol)

1- Boost immunity

Methandriol, or metylandrostenediol dipropionate, is the second medication in libriol; it has a greater anabolic than androgenic effect. Compared to the other ingredients in Libriol, it is not very helpful. Since its primary function in the body is to boost immunity, it does not assist users in gaining a lot of muscle.

2- Aids users' recovery from pains 

Additionally, it aids in the users' recovery from the aches and pains associated with exercise and keeps them from growing weary too quickly. It has the adverse effects—breast tissue growth and decreased sex desire—that all men worry about.

One milliliter of libriol contains thirty milligrams of nandrolone phenylpropionate and forty milligrams of methandriol dipropionate. For optimal results, you want 400–600 mg of libriol every week so that you can perform the maths. Because of the estrogenic side effects, avoid using libriol with steroids that aromatize quickly or take a while to take action.

Nandrolone/Libriol side effects

Nandrolone and Methylandrostenediol dipropionate (Methandriol). Let’s break down the key points about each one:

1- Nandrolone

Progesterone Receptor Interaction: Nandrolone directly interacts with the progesterone receptor, which may lead to adverse consequences like breast development, particularly in those who are at risk for gynecomastia.

Prolactin Levels: Using nandrolone can raise prolactin levels, which can have negative consequences such as shrinkage of the testicles. Medications such as cabergoline and bromocriptine are useful in reducing prolactin levels.

Testosterone Suppression: The normal synthesis of testosterone is greatly suppressed by nandrolone, which can result in impotence and a decrease in sex desire (often referred to as "deca dick"). It is advised to combine testosterone with nandrolone to lessen this impact.

2- Methylandrostenediol Dipropionate (Methandriol)

Anabolic/Androgenic Ratio: Methandriol is a weak steroid with a modest anabolic/androgenic ratio, suggesting it’s not highly effective for muscle or strength gains.

Immune System and Anti-Catabolic Effects: It may benefit the immune system and act as an anti-catabolic agent, potentially preventing illness in overtrained individuals and blocking the muscle-destroying effects of glucocorticoid hormones.

Estrogenic Properties: Methandriol exhibits estrogenic properties, which can lead to side effects like gynecomastia, fat gain, water retention, loss of sex drive, and suppression of natural testosterone production.

Water Retention and Blood Pressure: Its estrogenic effects may contribute to water retention, potentially leading to temporary strength gains from increased muscle volume. However, this can also increase blood pressure.

Lipid Effects: Lipid levels do not appear to be considerably impacted by methandriol.
Overall, both methandriol and nandrolone may have advantages and disadvantages. As such, caution should be exercised while using either one to minimize any potential negative effects.

Libriol Cycle

To achieve the recommended 400–600 mg of nandrolone per week, using 30 mg of nandrolone phenylpropionate and 40 mg of methandriol dipropionate per milliliter would require injecting 14–20 cc weekly in addition to other injectables, which would require a significant volume of injection. You would also receive an astounding 560-800 mg of the very estrogenic methandriol from this. If you are committed to using Libriol, the best plan of action would be to stack it with the anti-estrogen letrozole and testosterone propionate to reduce the tremendous amount of bloat that would inevitably follow. The athlete would not be able to handle the estrogenic side effects of Libriol when used with highly aromatizing medications such as Dianabol, Anadrol, and longer-lasting testosterone such as enanthate or cypionate. 


It has a high misuse and addiction risk, which can result in overdose and death. Taking this medicine with alcohol or other drugs that induce sleepiness or breathing issues (particularly opioid prescriptions like codeine and hydrocodone) can result in significant adverse effects, including death. To reduce your risk, your doctor should prescribe the smallest effective dose of chlordiazepoxide for the shortest period of time. Make sure you understand how to take chlordiazepoxide and which medicines you should avoid taking with it. See also the Drug Interactions section. If you experience any of the following very dangerous side effects: slow/shallow breathing, unusual lightheadedness, severe drowsiness/dizziness, and difficulties waking up, get medical attention immediately.

Stopping this medicine abruptly can induce dangerous (and perhaps deadly) withdrawal symptoms, especially if you've been taking it for a long period or in large doses. To avoid withdrawal, your doctor may gradually lessen your dose. If you have any withdrawal symptoms, such as headaches, difficulty sleeping, restlessness, hallucinations/confusion, depression, nausea, or seizures, notify your doctor or chemist immediately. Withdrawal symptoms can potentially last weeks or months.


  1. Libriol. Available at: (Accessed: 4 May 2024).
  2. Mullen, C., Whalley, B.J., Schifano, F. and Baker, J.S., 2020. Anabolic androgenic steroid abuse in the United Kingdom: An update. British journal of pharmacology, 177(10), pp.2180-2198.
  3. Librium Oral: Uses, Side Effects, Interactions, Pictures, Warnings & Dosing (no date) WebMD. WebMD. Available at: (Accessed: 4 May 2024).
  4. Available at: (Accessed: 4 May 2024).