I don't particularly like MSN but it comes on my feed, and there are some interesting articles. Copied and edited some points on this one (you can read it all if you want of course). Most of us will probably know and agree with much or all of it.
msn.com/en-gb/health/family...
The pitch sounds too good to be true
Vitamin and supplement manufacturers are not allowed to make claims that their product can reverse, prevent, or diagnose any disease or condition, but that doesn't mean they don't or won't.
Celebrity endorsement is the only endorsement
"If you are taking folic acid you may be getting as much as 70 percent more of this B vitamin than you need… "There is an upper limit for folate from folic acid and we know that very high levels can cause kidney damage or mask vitamin B12 deficiency… By contrast, relying on the DV for vitamin D could put you at risk for a shortfall of this important vitamin.
The label claims a top-secret blend
… Especially when they boast about a proprietary formula or blend... "You want to see specific amounts of each ingredient listed, not vagaries."
The doses are too low
Some vitamins and minerals may contain amounts that are too low to make any meaningful difference… "Manufacturers don't have to put in effective amounts,
Your pills are filled with junk
Some… fillers are flat out dangerous—such as magnesium silicate (aka talc), which is similar to asbestos in composition and can cause stomach and lung problems if you inhale or swallow
Key ingredients are missing
To rebalance your gut microbiome, probiotics should have multiple strains of bacteria,
The supplements are too pretty
Dyes are only added to vitamins to offset the colour loss from exposure to light, air, temperature extremes, moisture, and other conditions, or to enhance the appearance of the vitamin. Some dyes may be dangerous.
They're expired
This isn't necessarily a red flag.. "Companies want to make sure the vitamins remain potent through the date of expiration, so it's likely that they will contain 100 percent of what is claimed come expiration time."
You don't take them in the right combination
Some vitamins and minerals function better together, such as vitamin D, Vitamin K, and calcium. Vitamins D and K help the body and bones absorb calcium, so taking them together is one of many simple ways to boost your bones. Other winning combos include iron and vitamin C; vitamin C helps the body release a higher percentage of iron.
You take supplements in dangerous combinations
Many of us take supplements daily to improve our health and well-being—but taking certain vitamins and minerals together can be dangerous. Taking magnesium and calcium together can lessen the power of both.
You don't need what you are taking
Some people do need more of a certain vitamin or mineral for health reasons, but the only way to know for sure is by getting a blood test
It's a gummy
… some gummy supplements—particularly gummy multivitamins—don't contain their listed amounts of vitamins or minerals.... "We continue to find more problems with candy-like vitamins like gummies than with traditional forms, such as tablets and caplets… "I'm particularly concerned about folic acid in gummies...Many gummies contain far too much
It's the right vitamin in the wrong form
…magnesium, for example: Magnesium citrate and magnesium chloride may be better absorbed and tolerated than magnesium oxide. There are also pros and cons when it comes to liquid vitamins…"A benefit of a liquid is that you avoid the risk that an improperly made pill won't fully release its ingredients… However: "A risk of a liquid is that some ingredients are less stable in a liquid environment”
Underactive Thyroid meds & supplements
Magnesium, B Complex & Zinc supplements help!
Supplements while Hypo and Pregnant?
Which mineral supplement?
How to supplement properly? 
