Mind-body. That you can think yourself sick, or well. Not like magic, but a lot of the time. Like how people won't get sick until vacation a lot of the time, they say "don't have time to get sick" so then on the day off, the mind tells the body "ok now you have time!". All of my kids were born on a day off or weekend, same thing in a way. And once I read a book where the protagonist' hands were burned, very vividly described, and got blisters on my fingertips.

I just really believe a lot of physical illness, and health, comes from thinking.

Uff, i have a lot:

Life on earth is a huge organized organism. It created intelligent humans deliberately sothat we can spread life to other planets. Living beings (plants, insects, other animals, fungi) could not do that otherwise.

All life is sentient. Sentience doesn't come from the brain, rather it comes from the hormones in your bloodstream. When we sweat, these hormones enter the air (apparently within the fraction of a second) and other people can smell them. That is how we can instinctually know how others are feeling.

Also i have a lot of mythology:

Heaven (realm of all ideas, knowledge and forms) and Earth (origin of mass and material) are a love pair. Because they couldn't easily meet (there was an insurmountable gap between them), they created a bridge, which is life. This way, heaven supplies the shape (genes), and Earth supplies the body, and these two can be together in this way.

Viruses are books. They have a cover (shell) and contain scripture (RNA/DNA). We humans let them in because they are nature's messengers and have a specific purpose, which is to exchange some information.

Feng Shui, though I mostly credit it to the Dear Modern channel breaking the concept of qi and energy down into stuff like human traffic flow, activities, scenery, and noise, and using that to optimize spaces for comfort. It's mostly psychology, and some of the superstitious stuff I'm not really into.

I believe that literally every esotheric and nonesotheric bullshit is more trustworthy than everything a politician says at any given moment.

Definitely the lunar effect, but that is still under study. There's a documentary called "The Shark Side of the Moon" which follows a scientist trying to prove a lunar effect on sharks. There's also some inconclusive evidence of a lunar effect on people with bipolar disorder; the full moon might trigger mania, probably due to excess light during nighttime. Context: >!People with bipolar disorder (known as 'manic depression' years ago) are very sensitive to light, substances, and many other things that can trigger manic or depressive episodes for them. The possible mania under the full moon may be a reason behind myths like werewolves and terms like 'lunatic'.!<

I'll edit if I find more.

Edit: I found another one which I would easily try or suggest to others if evidence-based therapies have failed.

Eye movement desensitization and reprocessing (EMDR) is a form of psychotherapy in which the person being treated is asked to recall distressing images; the therapist then directs the person in one type of bilateral sensory input, such as side-to-side eye movements or hand tapping. It is included in several guidelines for the treatment of post-traumatic stress disorder (PTSD). Some clinical psychologists have argued that the eye movements do not add anything above imagery exposure and characterize its promotion and use as pseudoscience.

That's a long list I've only skimmed it and I didn't find the theory I like most, the stoned ape theory. That belief that some distant ancestors ate some shrooms and discovered art and a higher state of mind. I've taken a microdose a little too high and my vision was like an impressionist painting for a few moments and it made me so happy because Monet and Van Gogh now made absolute sense.

It might be a little too convenient but I think it works and it's really sweet.

It's hard resisting the power of the moon.

That wiki article is very biased.

It also has problems distinguishing pseudo medicine (proven not to work) from alternative medicine (not conclusively proved or disproved).

Body Memory

I mean, cellular memory and muscle memory exist.

I really want to believe the Assassin's Creed concept that our DNA holds memories from our ancestors.

Not sure either of these counts fully as what OP is looking for, but -

The idea of the technological singularity feels right to me. There's a whole section on the wikipedia page about scientific objections to it, and I get that, but if we don't kill ourselves before then, it seems like an event that almost has to occur at some point, to me. And maybe it zigs instead of zags and we get star trek. Or maybe it zags and we get terminator. But probably neither of those I'm guessing, and these days it's hard to imagine that it would put humanity on a worse trajectory than we seem to be on today.

Similarly, but less seriously (for me) I like to consider the whole "maybe we're in a simulation" theory.

Maybe like a limited Gaia hypothesis. The whole planet is a conscious thing, we are its braincells and its hands.

The USB law.

When you try to plug in a USB-A connector, there's a 70% probability it won't go in. Mathematically it should be 50%, but I don't believe that.

You switch it around, and there's a 30% probability it won't go in. This is not something they taught at school.

You switch it around the third time, and there's a 5% chance it still won't go in. Your mind begins to melt down, you switch and insert repeatedly until it finally works sooner or later.

The Moon landing was staged, but Stanley Kubrick insisted to shoot on location...

Love is a physical force, not just a human emotion.

Did I get that from Interstellar? Yes. Do I care? No.

Human life has meaning because we decide it does. That decision and that meaning are influenced by love, and the ensuing actions we take affect our physical environment.

Love takes energy and invokes acceleration of matter one way or the other. It’s a force.

Before she passed my Nan had chronic arthritis. She had many joint replacements (both hips, a knee, shoulder, pins in her wrists etc) and without medication life was a misery.

One thing she said gave her genuine relief was acupuncture, and she wasn't into pseudoscience at all. Maybe is was a placebo effect and it was expensive but it was worthwhile for her.

None. If any of it was reproducable it would science instead of pseudoscience

All electrical components contain magic smoke that was put into them at the time of manufacture. If that smoke is released, it doesn't work anymore.

Some broken or malfunctioning machinery respond to incantations projected with emotion. Cuss a machine hard enough and it will start working again.

Another one I've personally experienced, but don't know of any studies for: the main casting of machining equipment such as mills or lathes is a big crystal with unique properties. Each machine has different frequencies it resonates at when cutting. You can hear and feel the vibration when cutting and tune the machine/program for more efficient cutting and tool life. Sort of like taking a guitar that is out of tune and tuning it to a pleasant chord. Two identical machines will need different tunings. This tuning can change over time due to wear, temperature, humidity or maybe the phase of the moon.

Unrelated to machinery: there are mountain lions in the deep south in the deep woods. I had one check me out once. The state wildlife agency denies the modern existence of mountain lions and I didn't believe in them until I was face to face with one. I had to growl and hiss at it to convince it that I wasn't interesting.

Partly hollow earth. There are oceans in the crust, I think that is an accepted theory now. Life could have evolved to survive down there. It might not be anything special but a micro-organism is life too.

The only pseudo science I believe is that one day I'll be happy. Even though I know i ll never be happy.