LSD, sometimes known as acid, was first produced in 1938 in Switzerland by Dr Albert Hofmann whilst trying to find uses for a fungus called Ergot.

The fungus produces a chemical called 'lysergic acid' which, alongside another chemical called diethylamine is used to make LSD.

It's a tricky process and requires laboratory equipment and experience in chemistry.

It only takes a tiny amount of LSD to create mind bending reactions. But why do some people freak out when they take LSD?

To understand that, we first need to look at how your body controls your perception and mood.

In your brain, the chemical serotonin helps control your perceptions and moods.

However, LSD effects are unpredictable. The impact on the brain can vary depending on the strength of LSD, your own state of mind and the circumstances you are in. These can cause your mood and perceptions to be altered in different ways; sometimes pleasant - but sometimes unpleasant.

LSD plays with your imagination. This is known as tripping. But it can be scary and confusing – a bad trip.

You can't stop a trip once it's started and it can last more than half a day. You can also get unpleasant 'flashbacks' for days, weeks, or even months later.

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