In the world of sports and bodybuilding, anabolic steroids are ubiquitous. Among them, Anavar (Oxandrolone) is known as a "mild steroid" compared to other substances such as Dianabol, Testosterone or Trenbolone. In fact, this mild steroid produces few androgenic effects, while still being effective. It was created in the 1960s by the American laboratory Searle, now a Pfizer subsidiary. Anavar is above all a drug prescribed by doctors for patients suffering from weight loss due to illness or following surgery, to accelerate tissue regeneration. It is used for conditions such as osteoporosis, alcohol-induced hepatitis, blood anemia and weight loss due to AIDS.
Like many other anabolic steroids, Anavar has been hijacked for sports doping. Less aggressive, it is particularly popular with women for its low androgenic impact, while generating moderate but "clean" muscle gains and fat loss. It's also popular with beginners who want to "load up" with less risk of side effects.
This article looks at how Anavar works, its advantages and disadvantages, particularly in sport. You'll find practical recommendations if you want to take a course of treatment, practical advice, a user testimonial and answers to all your questions about responsible, informed use of this steroid.
Anavar, whose chemical name is oxandrolone, is a synthetic anabolic androgenic steroid derived from DHT (dihydrotestosterone). Unlike natural testosterone, whose anabolic/androgenic ratio is 1:1, oxandrolone achieves a ratio of 10:1. It's therefore excellent for building muscle, while having a low androgenic and virilizing effect(1).
Chemically speaking, Anavar is an oral 17-alpha alkyl derivative, i.e. a steroid chemically modified to resist degradation in the liver once ingested. It is therefore convenient, easy to administer and requires no injection. But it is also potentially toxic to this organ.
Anavar was launched in 1964, with the aim of treating serious illnesses. It is prescribed to preserve the muscles of AIDS patients, severe burn victims or people suffering from osteoporosis. It helps restore muscle mass without excessive water retention(2). A study published in the Journal of Clinical Endocrinology & Metabolism(3) shows that oxandrolone significantly increases muscle mass in patients suffering from involuntary weight loss, with doses of 2.5 to 20 mg per day. It works by activating androgen receptors in muscle tissue, which promotes protein synthesis and nitrogen retention.
For sport, and bodybuilding in particular, Anavar has the reputation of being a "soft" steroid, as it converts little to estrogen and minimizes side effects - the dreaded gynecomastia among them. Its anabolic power is rather moderate, less powerful, and with its short half-life (9 to 10 hours), it's necessary to take it in divided doses to keep blood levels stable(4).
Anavar is available in tablets with different dosages: 2.5 mg, 5 mg or 10 mg, and is easily found on the black market, although it is often counterfeited. This "light" steroid, which seems perfect for modifying body composition, is not without side effects either. Research(5) show that it not only improves strength and lean body mass in seniors, but also impacts blood lipids.
Athletes are always on the lookout for performance, useful muscle and less fat. And Anavar is seen as an aid that can help them achieve this goal. In a demanding sport like bodybuilding, it's an ally in achieving a dry, well-defined physique. Unlike other steroids, which make you explode but generate water retention and a "dirty" physique, Anavar causes little of it and allows you to achieve a drier, more sculpted body. So it's perfect in the dry phase, for greater muscle definition. The aim is to preserve noble mass while eliminating fat during the diet, resulting in a dry, even skinned, well-vascularized appearance with "hard" muscles(6). Anavar is the steroid for perfectionists, both discreet and effective.
Why is Anavar so popular? First and foremost, it's a good anabolic that delivers notable gains in muscle and strength, without excessive swelling. One study(7) from 1999 published in the Journal of Applied Physiology showed that 15 mg/day of oxandrolone in young men increased muscle protein synthesis by 44% in just 5 days! For bodybuilding, it enables rapid gains in mass and strength, while also ensuring a rapid recovery. In bodybuilding, it also helps to "harden" the physique before going on stage. It's not a myth: a systematic review from 2025(8) confirms its effectiveness in improving body composition in recovering athletes. What's more, Anavar boosts red blood cell production, which appeals to fans of Crossfit, hyrox or any competition requiring endurance. It also requires no injections, just pills to swallow.
Women often have a lot to lose by using steroids. The cause? Androgenic effects. That's why they appreciate Anavar so much for its low risk of virilization. With moderate doses of 5 to 10 mg/day, it enables you to gain 2 to 4 kg of muscle in 6 to 8 weeks, without altering your femininity. A real plus. Men can "stack" it with testosterone to counteract hormonal suppression and amplify the effects, without too much estrogen.
As we've seen, Anavar is a good steroid that's both gentle and effective. But its use comes with risks and side effects to be aware of. Let's take a closer look at the advantages and disadvantages of a course of treatment:
Muscle mass gain: Oxandrolone builds muscle, boosts protein synthesis and nitrogen retention. We often see a gain of 2 to 5 kg of dry muscle in 6 to 8 weeks. One study(9) on elderly subjects showed a 3 kg gain in lean body mass with 20 mg/day over 3 months, without water retention. When stacked with an anabolic steroid, it creates a synergistic effect and potentiates the effects of the other steroid, resulting in mass and strength gains.
Fat loss : Anavar oxidizes fat and reduces lipoprotein lipase. Ideal for burning visceral fat. Significant reduction in appetite, with induced effect on lipolysis. This results in weight loss for the user. Also, it does not cause hydrosodic retention. Some research confirms weight-loss benefits in HIV patients.
Greater strength and endurance: Anavar increases EPO production, and boosts muscle oxygenation. Anavar improves muscular strength by stimulating creatine synthesis, which in turn converts creatine into ATP, greatly increasing energy cell phone. Perfect for strength gains without significant weight gain.
Better recovery : Anavar reduces post-training protein breakdown. This can be useful for injured athletes in the recovery phase.
Low virilization : For women, low doses of 5 to 10 mg help build muscle while preserving femininity.
Anavar has many benefits and seems perfect and safe as a steroid, but can pose health concerns especially if abused. Here are some possible side effects:
Liver toxicity : As Anavar is C17-alpha alkylated, it will stress the liver. Cases of peliosis hepatis and tumors have been reported(10). A study(11) shows moderate elevation of liver enzymes (ALT/AST) at 20 mg/day, reversible after treatment.
Lipid imbalance : 30-50% drop in good cholesterol (HDL) and rise in bad cholesterol (LDL), increasing cardiovascular risk. Potential atherosclerosis(12). A review from 2004(13) confirms these temporary lipid changes.
Hormonal suppression: Anavar will reduce the testosterone present in the body by half at moderate doses. In men, there's a risk of testicular atrophy, and in women of virilization.
Cardiovascular effects : Aanavar increases blood pressure and risk of stroke/infarction(14).
Other effects : Acne, insomnia, mood swings, premature closure of epiphyses in children(15). A meta-analysis of 2025(16) reports a low incidence of side effects at therapeutic doses, but a high incidence with abuse.
As you can see, if you're considering a course of Anavar, it seems reasonable for short, controlled use. Of course, the risks require medical supervision.
Want to take a course of Anavar? It requires a careful approach and caution to minimize risks.
Here are a few tips to help you manage your treatment with this product:
Dosage : For trained men, 20 to 50 mg/day. For beginners, 20 to 30 mg. And for women, 5 to 10 mg/day. Divide into 2 or 3 doses for stable absorption.
Duration : 6 to 8 weeks max to avoid toxicity.
PCT : Post Cycle Therapy with Clomid/Nolvadex to restore hormones.
Support: TUDCA (500 mg/day) for liver, Citrus Bergamot for lipids; abundant hydration. Anavar is an alpha-alkylated steroid, making it toxic to liver function. The use of a Legalon, LIV160 or Samarine-type protector is recommended.
Power supply : Moderate calorie deficit (-500 kcal), high protein (2 g/kg body weight per day).
Training : Strength-oriented training (heavy pushing) + HIIT-type cardio.
Stacking : With testosterone (200-500 mg/week) for men, alone for women. Can also be used with Winny for dry training or competition preparation. A stack with sustanon or parabolan can be considered for rapid strength gains. This type of treatment will produce good-quality muscle mass without retention.
Here's an example of an Anavar cycle for a beginner (8 weeks):
Weeks 1 to 8 anavar 30 mg/day (15 mg morning, 15 mg evening).
Weeks 1 to 8: Testosterone Enanthate 300 mg/week (injections Monday/Thursday).
Power supply : 2500 kcal/day (40% protein, 40% carbohydrate, 20% fat). Target: -1 kg/week.
Training : 5 days/week (3 full-body + 2 cardio), progressive overload.
MDT (weeks 9 to 12) : Clomid 50 mg/day + Nolvadex 20 mg/day.
For a woman : Anavar solo 10 mg/day (5 mg x 2), 6 weeks. Strength training. Monitor virilization and stop if necessary.
No. In France, oxandrolone is a prescription-only narcotic. Buying or possessing it without a prescription is illegal. You risk fines (€3750 maximum) and up to 5 years' imprisonment. If you buy it on the black market, beware of counterfeits and the risk of intoxication.
In terms of federations and competitions, Anavar has been banned by WADA (World Anti-Doping Agency) since 2003. If you are caught in competition, you risk a suspension of 2 to 4 years. The product has been tested by sports authorities, and is detectable via hormone check-ups, even out of competition.
In short, you've got it, using Anavar for sport is legally risky, unethical, and not overly recommended for your health, even if the product is considered "mild". It's up to you to decide whether the risk is worth it.
Testimony of Mathilde, 24, bikini competitor:
"After 3 years of serious bodybuilding, I weighed 65 kg for 1m65, with 20% bodyfat. I'd always been terrified of steroids because of the side effects, and I'd seen the damage done to girlfriends and my partner - a well-known French competitor - who abused them. But for my first competition, I wanted to do things properly and opted for Anavar. I followed a short 6-week cycle at just 7.5 mg/day, divided into 2 doses morning and evening. At the same time, I followed a 2000 kcal diet with 150 g protein. From the second week onwards, I felt a difference. My lower-body sessions (squats, lunges, leg prss, leg curl and hip thrust) were really more productive, with more loads and without leaving the gym exhausted. I was in great shape, with shoulders that showed through the veins and abs like a champion (around week 4). A dry physique I'd never achieved before, au naturel. In the end, I lost 3 kg of fat while remaining sexy. I had no virilization problems and a stable libido. On the negative side, I had some mild headaches and a few pimples on my back, but nothing dramatic. During the cure, my boyfriend gave me TUDCA to protect the liver, and lots of professional advice for the post-cycle, with a light tamoxifen-based PCT to bounce back. In terms of results, I'm not going to hide it, I finished on the podium. Anavar gave me that little extra confidence and enabled me to reach another level, fortunately without too many pitfalls. I'd do it again, but only under medical supervision. I don't advise or encourage other girls to follow my path, because there are always risks. Especially those who don't compete."
Effects reported by Anavar users include nausea, sudden mood swings, acne, lipid changes (lower HDL). In women in particular, virilization risks are possible. And in men, suppression of testosterone. Studies also show that 20% of users report minor digestive problems. Don't sail blindly, and keep an eye on your blood tests during and around the cure.
It's true that it's very popular with women. And yes, at low doses (5 to 10 mg/day), it is interesting for women because of its low androgenic index. Some sources claim a virilization risk of less than 5% after 6 weeks' use. Of course, if you react to it (voice changes, hair growth), stop the treatment.
In general, 6 to 8 weeks, so as not to stress the liver too much. It is not recommended to go beyond 8 weeks, with doses of 20 to 50 mg. Don't forget the 4-week MDT.
Yes, it affects ketogenesis and thyroid hormones. Some studies show a loss of 2 kg of fat in 12 weeks. Anavar is interesting in the dry phase, for more muscle definition, in combination with a diet of course.
Yes, to restore testosterone, which has dropped by half. The protocol to follow is given above. Clomid 50 mg/day for 4 weeks.
Yes, up to 4 weeks post-cycle. Prohibited by sporting institutions and risk of suspension.
Ye
