Scroll through bodybuilding content online, and it is easy to see why bigger muscles are so appealing. Bigger arms, fuller shoulders and more defined bodies are constantly presented as signs of hard work and discipline. But not every dramatic muscle transformation comes from lifting heavier weights.

Some people use Synthol, an oil injected directly into muscles to make them look larger. The result can be striking, but it is not the same as building genuine muscle through exercise. Synthol is a type of site enhancement oil, and unlike anabolic steroids, it does not stimulate muscle growth or improve muscle strength. It simply adds volume to the area where it is injected.

That distinction is important because what looks like an impressive shortcut can eventually become a serious health problem.

So what is actually being injected?

Synthol is not a steroid. It is a mixture used specifically to change the appearance of a muscle. A commonly reported formulation contains about 85 percent medium chain triglyceride oil, 7.5 percent lidocaine and 7.5 percent alcohol, although products sold as Synthol can vary.

The oil is injected into a muscle such as the biceps, triceps, shoulders or calves. Instead of encouraging the body to produce new muscle tissue, it sits inside the muscle and creates additional volume. So while the arm may look bigger, the person has not suddenly developed stronger muscle fibres.

That is why medical literature describes site enhancement oils as cosmetic rather than genuine performance-enhancing substances. They can alter muscle size and shape without providing the strength benefits associated with actual muscle growth.

Nigerian medical doctor and health educator Aproko Doctor has also warned about the dangers of injecting oil into muscles. In a video addressing the practice, he highlights that using oil to try to increase muscle size can lead to serious infections. The warning is important because the apparent cosmetic benefit can make the practice seem relatively harmless, while the injection itself introduces a foreign substance directly into muscle tissue.

The appeal is obvious. Building significant muscle naturally takes months or years of consistent training, food and recovery. An injection can create a visible change much faster.

But the body does not necessarily treat the oil as harmless.

Because it is foreign material, the immune system can react to it. Inflammation, hardened tissue, cysts and fibrosis, where scar-like tissue develops, have all been reported after site enhancement oil injections. And the consequences do not always appear immediately.

The bigger problem can come years later

One of the most worrying things about Synthol is that someone can get the appearance they wanted and only discover the consequences much later.

A case report described a bodybuilder who developed painful, distorted biceps five years after receiving Synthol injections. Imaging showed abnormal lesions in the muscle, and surgery was eventually required to remove affected tissue.

Another case involved a man who developed painful inflammation and hardening in his biceps years after using site enhancement oil. More recently, doctors reported a case involving severe fibrosis and repeated infections following Synthol injections. The damaged tissue eventually had to be surgically removed.

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These cases do not mean every person who uses Synthol will develop severe complications. They do show, however, that the substance can remain in the body and cause problems long after the initial injection.

Other reported complications include infection, abscesses, nerve damage, muscle deformity and granulomas, which occur when the body forms inflammatory tissue around foreign material.

In serious cases, treating the damage may involve surgery. And removing injected material is not necessarily as simple as taking out a foreign object. Doctors have to deal with the surrounding tissue that may already have been damaged or replaced by fibrosis.

It can become more than a muscle problem

The risks are not always limited to the place where the oil was injected. Medical literature has reported serious complications involving the circulation and lungs, including embolic events. There have also been rare cases involving foreign material migrating to other parts of the body and triggering inflammatory reactions.

In one unusual case, doctors reported pulmonary granulomatosis and other complications associated with Synthol use. Another case involved injected material that had migrated and produced abnormalities on scans that initially looked similar to cancer.

These are unusual complications, and it would be misleading to suggest they are inevitable. But they underline why injecting oil into muscle is not a harmless cosmetic procedure.

There is also the basic risk that comes with injecting anything into the body. If the product or equipment is contaminated, an infection can develop. A serious infection may require medical treatment or surgery.

This is particularly concerning when people obtain substances through informal sellers or follow injection advice from other users rather than qualified healthcare professionals.

The internet makes the shortcut look better than it is

Part of the problem is that social media shows the result much better than it shows the consequences. A dramatic transformation can attract thousands of views. Someone showing enormous arms or shoulders can easily make an extreme physique look like something anyone can achieve with the right product.

What is less likely to appear on the same feed is the person dealing with painful, hardened tissue years later.

Research has also found that online bodybuilding communities can develop their own informal knowledge around Synthol and other site enhancement oils, with users sharing experiences and advice. That can make information from another user sound authoritative even when it is not medically reliable.

For anyone chasing bigger muscles, especially young people influenced by fitness content, the distinction between looking muscular and actually being muscular matters.

Real muscle growth comes from the body adapting to resistance training. Synthol creates volume. And that volume can come with inflammation, fibrosis, infection and permanent tissue damage.

There is nothing wrong with wanting to look stronger or improve your physique. But an injection that promises dramatic results without the years of training should probably raise more questions than excitement. Synthol can make a muscle look bigger. It cannot make the shortcut safe.

Meiza Nigeria