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Alternative, complementary and integrative medicine: what each means and what the evidence says

Alternative medicine is an approach that is not part of conventional medical care and is used in place of it. Complementary medicine is used together with conventional care, and integrative medicine coordinates the two. The evidence varies widely from one practice to another. None of them should replace prescribed treatment, and your doctor should know everything you take.

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You can cancel for a full refund or change the time up to 24 hours before your visit. Within 24 hours you can't cancel and there's no refund. If you don't join in the first 10 minutes, there's no refund.

If you choose a time less than 24 hours away, it can't be cancelled or changed.

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Is this an emergency?

This is not an emergency service. Call 911 or go to the nearest emergency room if you have:

  • Chest pain or pressure, shortness of breath or fainting
  • Weakness on one side of the body, trouble speaking or a sudden severe headache
  • Bleeding that will not stop, or vomit or stool with blood
  • Yellow skin or eyes, dark urine or severe upper-abdominal pain after using an herb or supplement
  • Hives, swelling of the face or throat or trouble breathing after taking an herb or supplement
  • Thoughts of harming yourself: call or text 988, or the Linea PAS at 1-800-981-0023

Warning signs: when to go to the ER

On this page (11)

A familiar scene

In the kitchen drawer there are bottles of capsules, herbal tea bags and the pills you were prescribed. You did not mention any of it at your last appointment, because you were not sure it mattered or feared being scolded. Meanwhile a symptom has gone weeks without being evaluated and the new tea seems the easier option. The cost of staying as you are is that nobody sees the whole picture: not what you take, and not what is actually going on.

What each term means

The three labels get mixed together in everyday conversation, which is why they confuse so many people. The National Center for Complementary and Integrative Health (NCCIH), part of the U.S. National Institutes of Health (NIH), defines them this way:

  • Complementary medicine. An approach that is not part of conventional medical care and is used together with conventional medicine. Example: someone who keeps up their prescribed treatment and also practices meditation to manage stress.
  • Alternative medicine. A non-mainstream approach used in place of conventional medicine. This is where the biggest risk sits: stopping a treatment that works, or delaying a diagnosis, for something with less evidence.
  • Integrative medicine (integrative health). Brings conventional and complementary approaches together in a coordinated way, with your doctor aware of everything you do.

What falls under these terms

NCCIH groups these approaches by what they do: nutritional (diets, dietary supplements, herbs, probiotics), psychological (such as mindfulness), physical (such as massage or spinal manipulation) and combinations (such as yoga, tai chi or acupuncture, or mindful eating).

In a 2012 national survey cited by NCCIH, more than 30 percent of U.S. adults and about 12 percent of children used one or more of them. That figure is dated and from a national survey, but it shows how common this is. What matters is that your doctor knows.

Phrases like “alternative therapies” and “natural medicine” are used loosely. “Natural” describes where something comes from, not whether it is safe or whether it works.

What the evidence says, honestly

There is no single answer to “does alternative medicine work?”, because every practice has its own evidence. What can be said:

  • Evidence differs for every practice. Some have been studied a lot and others hardly at all; results also depend on the person and the quality of the study. Ask what is known for your situation.
  • Sleep, physical activity, eating pattern and stress management are part of ordinary medical care. See the lifestyle medicine guide and how to reset your sleep schedule.
  • Herbs and supplements. Supplements are not approved to treat disease. A product that promises to “cleanse” the body, “cure everything” or replace your medicines is not approved to treat or prevent any disease.

What few people tell you: “natural” does not mean safe

Herbs and supplements are active substances. NCCIH warns that “natural” does not always mean “safe”: kava, for example, has been linked to serious liver damage. And supplements can interact with prescription and over-the-counter medicines.

The U.S. Food and Drug Administration (FDA) does not approve dietary supplements for safety and effectiveness before they are sold. A product intended to treat a disease is regulated as a drug, even if it is labeled a supplement. What is on the label does not always match what is in the bottle.

Interactions: when to be most careful

These are examples of situations where it matters most that your doctor and pharmacist know exactly what you take. The list is not complete, and a product missing from it is not safe by default:

  • Blood thinners. Some supplements and herbs can raise bleeding risk or change how the medicine works.
  • Blood-pressure, heart and diabetes medicines. Some products can change the effect of what you were prescribed. Ask before combining them.
  • Antidepressants and mood medicines. St. John’s wort makes many medicines less effective, and other products can interact with antidepressants.
  • Surgery and anesthesia. Some supplements can increase bleeding or affect anesthesia. Tell your surgeon and pharmacist well ahead of time about everything you take.
  • Lab tests. Some supplements can interfere with results. Tell whoever orders your labs what you use.
  • Pregnancy, breastfeeding and children. Many products have not been tested in these stages. Check before using any of them.

How to tell your doctor what you use

Many people leave it out because they think the doctor will not care or will disapprove. It is the other way around: it is information that changes decisions. To make it a good conversation:

  • Write down everything: prescriptions, over-the-counter medicines, vitamins, supplements, herbs, teas, oils and any product someone recommended.
  • Include the brand, the dose, how often you take it and since when. If you can, bring the bottles or photograph the labels.
  • Say why you take it and what you hope to notice, so your doctor can tell you honestly what is known about it.
  • Mention therapies you receive from other practitioners too (massage, acupuncture, chiropractic, yoga).
  • Do not stop or change a prescribed medicine on your own. That decision is made with your doctor.

How to choose a complementary-therapy practitioner

If you decide to use therapies from other practitioners, these questions protect your safety:

  • Do they hold a current license or certificate that I can verify with the body that issues it? Ask about their training and how long they have practiced.
  • Do they work in coordination with my doctor, or ask me to keep the therapy a secret? Be wary of the second.
  • Do they tell me what is known and not known about their therapy, or promise guaranteed results?
  • Do they ask me to stop my medicines, decline a test or skip a vaccine? That is a serious warning sign.
  • Do they give prices in writing, without pressure to buy their own products or packages?

When to stop trying remedies and see a doctor

Trying a tea or a supplement for a few weeks can seem harmless, but the cost of waiting is real when a symptom has not been evaluated. Fatigue that does not lift, pain that keeps returning, unexplained weight change, shortness of breath, bleeding or a new lump needs a medical evaluation and, sometimes, lab tests, not another product.

See a doctor soon if a symptom has lasted more than a couple of weeks, is getting worse, keeps coming back or gets in the way of normal life; if you are pregnant or have a chronic illness; or if you were told to take a treatment and want to change it.

With warning signs, do not wait: call 911 or go to the emergency room. See what counts as an emergency.

Where Dr. Nieves Castro fits

The Health Initiative (THI) is the nonprofit that runs this telehealth clinic. Dr. Diana Nieves Castro is a general practice physician licensed in Puerto Rico. Her visit is a medical visit: first an assessment of your history and symptoms, and then sleep, nutrition, movement, stress and a review of everything you take.

In a video visit she can evaluate, diagnose, treat, prescribe when appropriate and order labs at a nearby lab. She can review the medicines, supplements, herbs and teas you already use, look for interactions, tell you honestly what is known and help you coordinate with other practitioners.

This is a visit with a licensed physician. Therapies such as acupuncture or chiropractic are provided by separately licensed practitioners, and she can help you decide what to ask them.

Online visits are for people who are physically in Puerto Rico. For lab follow-up and non-controlled refills, see follow-up visits, lab orders and primary care.

Your next step

Write down everything you take today, and request an online visit so the doctor can go through the list with you, alongside your history and symptoms. Have any lab results handy. For the cost, see the pricing page.

As related reading, THI also runs an in-person wellness retreat in Puerto Rico, held in English; it is wellness, not medical treatment and not a substitute for medical care.

This guide is general information. It is not a diagnosis and does not replace your doctor. Do not stop, change or delay medicines, vaccines or screenings without talking to a health professional.

How we care for you

  • We evaluate, diagnose and treat; if needed, we give you a lab order for a lab near you.

  • We see adults and children of all ages. Patients under 21: a parent with patria potestad (parental authority) or a legal guardian is on camera for the whole visit and shows photo ID.

  • Real-time video visit. We send you a secure video link. It works on your phone, tablet or computer.

  • If appropriate, the doctor prescribes and we send your prescription to your pharmacy.

  • You must be physically in Puerto Rico during the visit (visitors, tourists and cruise passengers are welcome).

  • In an emergency, call 911.

Frequently asked questions

What is the difference between alternative and complementary medicine?

Complementary is used together with conventional medicine; alternative is used in place of it. The biggest risk sits with alternative, because it can lead to stopping or delaying a treatment that works. Integrative coordinates both with your doctor.

Does alternative medicine work?

It depends on the practice and what it is used for. Evidence differs for each practice, and supplements are not approved to treat disease. Ask what is known for your situation. None should replace a treatment your doctor prescribed.

Are supplements and herbs safe because they are natural?

No. “Natural” does not mean safe. Herbs and supplements can have side effects and interact with prescription and over-the-counter medicines, and they are not approved to treat disease. Check with your doctor or pharmacist before starting, especially if you use blood thinners, have diabetes, are pregnant or are having surgery.

Should I tell my doctor I use alternative therapies?

Yes. It is information that can change a prescription, a lab test or the timing of surgery. Bring a list with the brand, dose and reason for each product. Talking about it does not commit you to stopping anything; it helps you use it more safely.

Can Dr. Nieves Castro review the supplements and natural remedies I use?

Yes. In the visit she can go through what you already take, check for interactions with your medicines and explain what is known. It is a medical visit with a physician licensed in Puerto Rico; therapies such as acupuncture are provided by other licensed practitioners.

Can I stop my medicines if I start something natural?

Do not do it on your own. Stopping or changing a prescribed medicine without talking to your doctor can be dangerous. If a medicine worries you, tell your doctor, who can review it with you and weigh options safely.

Video visit

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Video doctor visits 24/7 — book online and choose your time right away.

Pay now, then choose your time right away. Full refund if you cancel 24 hours or more ahead.

See the cancellation policy

You can cancel for a full refund or change the time up to 24 hours before your visit. Within 24 hours you can't cancel and there's no refund. If you don't join in the first 10 minutes, there's no refund.

If you choose a time less than 24 hours away, it can't be cancelled or changed.

If the clinic can't see you, for example because of a technical problem on our side, we refund you in full.

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Medical care provided by Dr. Diana Nieves Castro, MD (PR license 24027)

About this page

Author: The Health Initiative

Medical care provided by Dr. Diana Nieves Castro, MD (PR license 24027)

Disclosure: Founding Executive Director of The Health Initiative

Published: 2026-10-15 · Updated: 2026-10-15