Natural 'limitless pill' could be alternative to viral drug taken by celebrities following doctor's warning

People are claiming that a natural substance could be an alternative to the viral 'limitless\ drug, methylene blue.

The drug, which is said to enhance cognitive function, was originally discovered back in the 19th century and used as a textile dye.

The substance was later revealed to have certain medical uses, such as treating a blood disorder known as methemoglobinemia, which is when red blood cells cannot carry enough oxygen. It has also been used in the treatment of malaria and even as an antidote to cyanide poisoning.

Although not proven scientifically, some claim it also slows down ageing, enhances memory, improves mood and even prevents cancer. However, there are some pretty serious side effects to taking the substance, with a study claiming it can cause serotonin toxicity.

Serotonin syndrome can be defined as a serious drug reaction, according to Mayo Clinic, that is caused by medications that build up excess levels of serotonin in the body.

Methylene blue has been suggested to be a health supplement (Getty Stock Image)

This chemical is produced naturally by the body, and it is needed for nerve cells and the brain to function, but too much of it can cause unwanted symptoms.

It includes shivering, diarrhoea, muscle rigidity, fever, and seizures. Severe cases of the condition can also lead to death.

Neuroscientist Anne-Sophie Fluri told the MailOnline: “Without solid evidence in humans, these claims are at best speculative and at worst potentially dangerous.

"The brain is not a machine you can casually 'optimise' like a smartphone."

Now, one online shop, Health Primitive, has claimed that a substance called blue spirulina could have similar benefits.

In a blog post, they write: "Blue spirulina is an antioxidant-rich extract that has a vibrant blue hue.

Methylene blue was originally used as a textile dye (Getty Stock Images)

"Phycocyanin, the active component of blue spirulina, possesses powerful antioxidant properties that help protect cells against oxidative stress and damage caused by free radicals. This in turn can reduce inflammation in the body and offer anti-aging benefits."

Over on Healthline, experts explain that blue spirulina 'is the phycocyanin pigment extracted from the spirulina algae [and] contains antioxidants and may support brain, immune, and cardiovascular health, among other benefits'.

Although they emphasise that more research is needed to understand its effectiveness, they note that 'It may support cardiovascular health, brain health, and weight loss'.

"Blue spirulina contains antioxidants, which may help support your body’s defences and protect you from illness and disease," explain Healthline. "Phycocyanin, the antioxidant responsible for blue spirulina’s color, may also have benefits for your immune health."

Blue spirulina is said to have some health benefits (Getty Stock Photo)

These can include:

• Reducing inflammation
• Regulating the immune system
• Reducing oxidative stress
• Anticancer benefits
• Antimicrobial benefits
• Supporting wound healing
• Supporting kidney health
• Supporting liver health
• Reducing the risk of diabetes

As always, it's important to consult your doctor before taking any medications or supplements, to ensure they're suitable for your own specific needs and circumstances.