Can You Use Human Vitamins for Plants? Are Expired Multivitamins Safe?

Internet is filled with many gardening hacks that can actually save your time. But, not all are true!

Use of expired multivitamins for plants is one of the hacks that is claimed to help plant growth. Now, the question arises, is it safe for indoor plants? Can it replace fertilizers?

To end this debate, let’s check the scientific study carried out at University of Southern California. The report concludes that use of vitamin D, calcium and vitamin C has positive impact on plant growth. However, iron use slowed the growth of parsley plant.

But, this doesn’t mean you should replace them with liquid fertilizer used to enrich potting soil.

Instead of throwing them out, you can dissolve these multivitamins in water and pour it to plants.

Can You Use Human Vitamins for Plants?

Apart from using natural homemade fertilizers, plants can benefit from supplement capsules dissolved in water.

Plants do require essential nutrients like nitrogen, phosphorus and potassium to grow and produce blooms.

Some gardening enthusiasts have pondered on the idea of using multivitamins to enrich plant soil.

Though there are studies that show that vitamin D and calcium can contribute in optimal growth of the plant. Excess use can harm plant growth, due to over-fertilization.

Pros of Plant Vitamins

  • Familiar Ingredients: Apart from macronutrients like NPK, plants need micronutrients like calcium, magnesium and sulfur, which are available in various vitamin capsules.
  • Cost-Effective Option: Instead of throwing expired tablets, you can use them to enrich plant soil.
  • Repurposing: Gardeners love to repurpose things. Using human vitamins is a great way to reduce your trips to the garden center.

But, don’t rely only on these capsules. Your plants still need liquid fertilizers to thrive. As balanced liquid fertilizer are filled with essential nutrients that strengthen plant stem, form leaves and produce blossoms.

Read this before dissolving vitamin capsules in water:

  • Soil test to gauge nutritional needs of your plant. Else, you may end-up over-fertilizing the plant.
  • Check the vitamin label for additives or fillers that might not be plant-friendly. Stick to basic vitamins without unnecessary additives.
  • Choose water-soluble vitamins, making it easier for plants to absorb the nutrients.

How Human Vitamins Can Help Plants?

When it comes to caring for your plants, you may be surprised to learn that the very vitamins you find in your medicine cabinet can help your plants grow stronger. Let’s take a closer look at human vitamins and how they can help your plants:

1. Supplementing Essential Nutrients

Along with macronutrients like nitrogen, phosphorus and potassium, plants need micronutrients to carry out photosynthesis process and to improve its ability to absorb nutrients from the soil.

Most human vitamins contain essential micronutrients such as magnesium and calcium, as well as various vitamins that are necessary for plant development.

These micronutrients are necessary for photosynthesis, the activation of enzymes, and other cellular functions.

2. Cost-Effective Nutrient Source

One of the best things about gardening is finding low-cost solutions.

Human vitamins are a great low-cost alternative to expensive plant supplements. Instead of buying special fertilizers for your plants, you can use what you have at home.

3. Convenient Application

Just take vitamin tablets and dissolve it in water and you’re ready to use it.

You don’t have to go to the garden center to get human vitamins; they’re right in your medicine cabinet.

This convenience makes it easier for gardeners to try human vitamin supplements for their plants.

4. Addressing Nutrient Deficiencies

Regular watering depletes nutrients from the soil. Adding human vitamins can fill the gaps and avoid signs of nutritional deficiency.

This is especially useful for gardeners, who may not always have access to high-quality plant supplements.

How to Apply Expired Vitamins to Plants?

Expired vitamins can be a great way to reuse things you might otherwise throw away. Here’s how to use expired vitamins responsibly on your plants.

1. Check for Harmful Additives

Check the ingredients carefully before using expired vitamins on your plants. Make sure there are no fillers or additives that could harm your plants.

2. Determine Water Solubility

If you are looking for expired vitamins, look for ones that are water soluble. Water soluble vitamins are easier for plants to digest, making them a great option for your product.

3. Crush or Dissolve

If you have expired vitamins in pill form, you can crush them to make it easier to mix. Or, you can mix them in water to make a vitamin rich solution.

4. Dilute Properly

Dilution is the key to avoiding over-fertilization which can damage your plants. Stick to the recommended dilution ratios according to the types of vitamins you use.

A good rule of thumb is to dissolve 1 or 2 expired vitamins in 1 gallon of water.

5. Foliar Feeding

If you’re looking for a quick way to increase your plant’s nutrients, foliar feeding is a great option. Simply spray the vitamin solution you’re diluting directly onto your plants’ leaves for quick absorption.

6. Root Application

Alternatively, you can spread the diluted vitamin solution on the soil around your roots. This will allow your plants to soak up the nutrients as they soak up water from the soil.

7. Monitor Plant Response

Keep a close eye on your plants after applying the expired vitamins. Monitor for any signs of improvement or adverse reactions. If you notice negative effects, discontinue use.

8. Consider Micronutrient Content

After applying the expired vitamins, keep an eye on your plants. See if you notice any improvement or any side effects. If you notice any side effects, stop using the vitamins.

9. Use as Complement, Not Substitute

However, it’s important to remember that expired vitamins are more like supplements and should not be used as a substitute for plant nutrition.

Your plants may not have all the nutrients they need, so make sure they’re getting enough from other sources.

10. Dispose of Responsibly

If you have expired vitamins that are not being used for your plants, make sure to dispose of them properly.

Many local pharmacies and recycling centers will accept expired medications and expired vitamins for disposal.

How Aspirin Benefit Tomato Plants?

While there are some studies and anecdotal reports that support these claims, there is little scientific consensus on the effectiveness of aspirin on plants.

In addition, too much of a good thing can be bad for plants, so it’s important to stick to recommended dilutions and application rates.

It’s always a good idea to test a few plants on your entire garden before adding any new treatment. That way, you can see how your plants respond to the new treatment.

If you have any questions or concerns about the tomato plants or your garden, it’s a good idea to reach out to local horticulturists or extension services. Depending on your area and plant varieties, you may be able to get tailored advice.

  1. Disease Resistance: Aspirin stimulates the plant’s immune system, making it more susceptible to certain illnesses. It stimulates the plant’s defense system, allowing it to fight off harmful organisms.
  2. Stress Reduction: Aspirin can help tomato plants tolerate a variety of stressors, including environmental stressors (such as extreme temperature changes) or stressors caused by transplantation.
  3. Increased YieldAspirin treatments may improve tomato plant health and stress resistance, according to some studies. Aspirin treatments may also improve fruit production and overall tomato yield.

16 Essential Nutrients for Plant Growth

The right balance of nutrients is essential for plant growth. Knowing what your plants need and making sure they’re getting the right nutrients will help them grow well, have strong foliage, and reproduce.

Whether you’re using natural soil fertility or adding fertilizers, you’ll want to keep your garden nutrient-rich.


Nitrogen (N):

Key for leaf and stem development, essential for the synthesis of proteins and chlorophyll.

Phosphorus (P):

Critical for energy transfer and storage, vital for root development, flowering, and fruiting.

Potassium (K):

Promotes overall plant vigor, regulates water uptake, and aids in disease resistance.

Calcium (Ca):

Essential for cell wall structure, cell division, and root development.

Magnesium (Mg):

A component of chlorophyll, crucial for photosynthesis and overall plant metabolism.

Sulfur (S):

Important for amino acid and protein synthesis, contributes to plant structure and resilience.


Iron (Fe):

Essential for chlorophyll production, plays a role in photosynthesis and overall plant health.

Manganese (Mn):

Aids in photosynthesis, activates enzymes, and contributes to root growth.

Zinc (Zn):

Essential for enzyme activation, hormone regulation, and seed formation.

Copper (Cu):

Necessary for photosynthesis and enzyme function, contributes to plant resilience.

Molybdenum (Mo):

Facilitates nitrogen metabolism, important for overall nutrient uptake.

Boron (B):

Essential for cell wall formation, pollen development, and seed production.

Chlorine (Cl):

Involved in photosynthesis, aids in osmosis and ion balance.

Nickel (Ni):

Required for nitrogen metabolism, activates certain enzymes in plants.

Cobalt (Co):

Facilitates nitrogen fixation in legumes and supports overall plant growth.

Silicon (Si):

Enhances plant structure, improves resistance to abiotic stress, and contributes to disease resistance.


It can fun and cost-effective to use human vitamins for plants, but you should remember that plants needed balanced nutrients for optimal growth.

Conduct a soil test before adding supplement tablets to plants.

To use expired vitamin tablets you should dissolve 1-2 capsules in water and slightly heat to completely dissolve it.

Pout the water to plant regularly and see the impact on these nutrients.

However, this should be done with caution, knowing what your plants need and the limitations of human supplements. Keep an eye on your plants to see if they have any adverse reactions. When in doubt, talk to a gardening expert or professionals for personalized advice.

Don’t forget, the green world may love a shot of vitamin C from your medicine drawer, but the key to a healthy garden is good taste and good taste.