The absorption of vitamins from a pill taken orally can vary depending on several factors.

These factors include the specific vitamin, the form of the supplement (such as capsules, tablets, or chewables), the individual's digestive system, and whether the supplement is taken with food or on an empty stomach.

In general, the absorption of most vitamins from oral supplements can range from 10% to 90%.

However, it's important to note that some vitamins have better absorption rates than others. For example, water-soluble vitamins like vitamin C and B vitamins tend to have higher absorption rates compared to fat-soluble vitamins like vitamins A, D, E, and K.

If you've been consuming vitamin supplements and haven't noticed any noticeable results, there could be several reasons for this:

1. Timeframe: Vitamins and dietary supplements may take time to show their effects. It's possible that you haven't given them enough time to work. Results can vary depending on the specific supplement and your body's needs.

2. Dosage: The dosage you're taking may not be appropriate for your needs. It's important to follow the recommended dosage instructions provided on the supplement packaging or consult a healthcare professional for guidance.

3. Nutrient deficiency: If you're taking a vitamin supplement to address a specific deficiency, it's essential to ensure that you're targeting the correct nutrient. Vitamin supplements are most effective when used to address specific deficiencies diagnosed by a healthcare professional.

4. Absorption issues: Your body's ability to absorb vitamins and minerals can vary. Some people may have underlying health conditions or digestive disorders that hinder nutrient absorption. If you suspect this might be the case, consult a healthcare professional for evaluation.

5. Lifestyle factors: Vitamins and supplements are not a substitute for a healthy lifestyle. If your overall diet is lacking essential nutrients, taking a vitamin supplement alone may not yield noticeable results. It's important to maintain a balanced diet, exercise regularly, manage stress, and get enough sleep for optimal health.

6. Placebo effect: Sometimes, the perceived benefits of taking a supplement may be influenced by the placebo effect. It's possible that any positive effects you were expecting might be more psychological than physiological. Remember, while vitamins and supplements can support overall health, they should not replace a balanced diet or proper medical advice. If you have concerns about your health or the effectiveness of a particular supplement, it's best to consult with a healthcare professional.

Infusions, such as intravenous (IV) infusions or intramuscular (IM) injections, bypass the digestive system and deliver vitamins directly into the bloodstream. This method allows for higher bioavailability and absorption compared to oral supplements.

When vitamins are administered through infusions, they are typically absorbed more efficiently and completely, resulting in higher levels of the vitamins in the body. This is because the digestive system is bypassed, which can sometimes hinder the absorption of certain vitamins.

The absorption rate of vitamins through infusions can vary depending on the specific vitamin and individual factors. However, generally speaking, IV infusions and IM injections offer higher absorption rates compared to oral supplementation. It's worth noting that receiving vitamins through infusions should be done under the guidance of a healthcare professional, as they can determine the appropriate dosage and administration method based on your individual needs and health condition.