Most dietary supplements are useless, but here are the ones you should take

Last year, the world's largest dietary supplement maker, GNC Holdings Inc, agreed to pay $2.25 million to avoid federal prosecution over its alleged sale of illegal pills and powders.

And the Food and Drug Administration has ordered the makers of several supplements to recall their products after scientists found traces of illegal and potentially dangerous molecules in their formulas.

Still, while many supplements are useless, there are others that we can't enough of simply by eating a healthy diet.

So here are the supplements you should take — and the ones to avoid.

Protein powder: Skip it — eat beans, tofu, nuts, fish, or meat instead.

Homeopathic remedies: Skip them — they don't work.

Workout boosters like Jack3d or OxyElite Pro: Skip them — they've been linked to illness and at least one death.

For years, the makers of these supplements, whose active ingredient is dimethylamylamine (DMAA), claimed that they increased speed, strength, and endurance.

two soldiers 2015 indictment against Dallas company USPlabs, which makes OxyElite Pro, accused the company of falsely claiming that its product was made of natural plant extracts. In reality, it contained synthetic stimulants made in China. The indictment also claimed that the use of OxyElite led to several liver injuries and at least one death.

Zinc: Take it — it's one of the only ingredients shown to shorten colds.

Zinc seems to interfere with the replication of rhinoviruses, the bugs that cause the common cold.

In a 2011 review that looked at studies of people who'd recently gotten sick, researchers compared those who'd started taking zinc with those who just took a placebo. The ones on zinc had shorter colds and less severe symptoms.

Creatine: Skip it — eat meat instead.

We all produce natural, low-level amounts of creatine, a compound that helps our muscles release energy. Studies show that we produce more of it when we eat meat regularly.

Research suggests that taking creatine supplements could have moderate benefits on specific kinds of short-intensity workouts. It appears to help muscles make more adenosine triphosphate (ATP), a chemical-energy transporter. But unsurprisingly, there's no evidence that it's beneficial for other types of exercise involving endurance or aerobics.

So treat yourself to the occasional steak dinner instead.

Weight-loss pills like "Hydroxycut": Skip them — their claims are dubious.

, a powerful stimulant linked to 155 deaths that was banned by the US Food and Drug Administration in 2003.

Antioxidants: Skip them — an excess of these has been linked to an increased risk of certain cancers, and you can eat berries instead.

are antioxidants found in many fruits — especially berries — and veggies. Some have been touted for their alleged cancer-prevention abilities, while others have been sold under the premise that they protect the brain against dementia.

But studies suggest that when taken in excess, antioxidants can actually be harmful. A large, long-term study of male smokers found that those who regularly took Vitamin A were more likely to get lung cancer than those who didn't. In a study published in March 2017, 7,500 men were split into four groups, and given vitamin E, selenium, both, or a placebo for 5 years. The results suggested that the prevalence of dementia didn’t differ significantly amongst any of the groups.

A 2007 review of trials of several types of antioxidant supplements put it this way: "Treatment with beta carotene, vitamin A, and vitamin E may increase mortality."

Folic acid: Take it if you're pregnant or want to get pregnant.

Our bodies use folic acid to make new cells. The National Institutes of Health recommends that women who are currently pregnant or who want to get pregnant take 400 micrograms of folic acid daily, since their bodies demand more of this nutrient when carrying a growing fetus.

Several large studies have also linked folic acid supplementation before and during pregnancy with decreased rates of neural-tube defects, which are serious and life-threatening defects of a baby's brain, spine, or spinal cord.

Green-coffee extract: Skip it — the only study backing it was pulled.

Green-tea extract: Try it — it's been linked with some health benefits, and is generally considered safe.

Fish-oil pills: Skip them — you can eat salmon instead.

Ginseng: Skip it — scientists say more research is needed to prove that it's safe.

A two-month 2010 study of nearly 300 cancer patients at the Mayo Clinic found that those given 1,000 or 2,000 milligrams of ginseng each day reported feeling more energized compared with those who took a placebo. Other research suggests that ginseng can help relieve moderate fatigue in healthy people as well.

But more studies on its long-term safety are needed.

Gingko biloba: Skip it — the studies don't prove it helps.

Ginkgo biloba, which comes from the maidenhair tree,