Lower than normal for the individual blood pressure, causing symptoms such as dizziness or lightheartedness, fainting; lack of concentration; blurred vision; nausea; cold, clammy, pale skin; rapid, shallow breathing; fatigue; depression and thirst. 
Blood pressure (the pressure of the blood in the circulatory system, related to the force and rate of the heartbeat and the diameter and elasticity of the arterial walls) varies from person to person. Generally a reading of 90 millimeters of mercury (mm Hg) or less systolic blood pressure or 60 mm Hg or less diastolic blood pressure is considered low blood pressure. The causes of low blood pressure can range from dehydration and fasting to serious medical or surgical disorders. As long as there are no other symptoms such as dizziness or lightheadedness, abnormally low heart rate (<50 unless an athlete) or breathing problems/allergic reactions, cold/pale skin, blurred vision, there  is no need for concern.

Hemoglobin is the protein molecule in red blood cells that carries oxygen from the lungs to the body's tissues and returns carbon dioxide from the tissues back to the lung
Number of hemoglobin molecules per deciliter considered to be healthy is 13.5 to 17.5 grams per deciliter for men and 12.0 to 15.5 grams per deciliter  . for women,. For children, mean values are between 11 and 16.5 g/dL These reference ranges may differ from one medical practice to another depending on the individual laboratory, instruments, and methods.

Mild anemia is considered when hemoglobin is between 9.5 - 13.0 g/dL. Moderate anemia is considered when hemoglobin is between 8.0 - 9.5 g/dL. Severe anemia is considered for hemoglobin concentrations below 8.0 g/dL. Based on the available evidence, transfusion in the critically ill patient without active ischemic heart disease should generally be withheld until the hemoglobin level falls to 7 g/dl. The old 1030 rule (hemoglobin of 10 g/dl and a hematocrit levels falling below 30%) is now considered to be ill advised. The hemoglobin level at which serious morbidity or mortality occurs in critically ill patients with active ischemic heart disease is a subject of continued debate but it is likely that a set transfusion trigger will not provide an optimal risk–benefit profile in this population.

Electromagnetic radiation visible to the human eye and is responsible for the sense of sight. (with wavelengths between 400–700 nm and frequencies 430-750 terahertz, between the infrared and the ultraviolet. 

Main source of light on Earth is from the Sun. Exposure to the ultraviolet radiation (UVR) in sunlight has both beneficial and deleterious effects on human health.

The best-known benefit of sunlight is its ability to boost the body’s vitamin D supply; most cases of vitamin D deficiency are due to lack of outdoor sun exposure. 
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Artificial light is composed of visible light as well as some ultraviolet (UV) and infrared (IR) radiations, and there is a concern that the emission levels of some lamps could be harmful for the skin and the eyes.

The majority of lamps used for normal lighting conditions are RG0 (lowest risk) and most of the rare exceptions are RG1 (minimal risk: not hazardous during normal circumstances). Provided that these lamps are used at the distances for which they were intended, the UV, IR or blue light radiation they emit should pose little or no risk to non-photosensitive people.
Recent measurements show that a large proportion of the UV radiation from tungsten halogen lamps is in the UVC range, which is particularly harmful.

UVA radiation (95–97% of the UVR that reaches Earth’s surface) penetrates deeply into the skin, where it can contribute to skin cancer indirectly via generation of DNA-damaging molecules such as hydroxyl and oxygen radicals. Sunburn is caused by too much UVB radiation; this form also leads to direct DNA damage and promotes various skin cancers. Both forms can damage collagen fibers, destroy vitamin A in skin, accelerate aging of the skin, and increase the risk of skin cancers. Excessive sun exposure can also cause cataracts and diseases aggravated by UVR-induced immunosuppression such as reactivation of some latent viruses.

After issues of safety, light pollution has a wide range of negative effects on human health such as disrupting circadian rhythms,  melatonin levels, and contributing to sleeping disorder.

Firmicutes, Lactobacilli bacteria that naturally inhabits digestive tract (aka alimentary canal: esophagus, stomach, and intestines) and is used as probiotics

When added to dog faecal cultures, LA4 reduced enterococci and increased lactobacilli counts throughout the study. In mice it induced healthful immune responses that reduce chronic inflammation associated to Mycobacterium avium infection. 

Lactobacillus gasseri is an anaerobic, gram-positive Lactobacillus (lactic acid) bacterium. It is a rod shaped and of the non-spore-forming type and is typically found in the gastrointestinal tracts of humans and animals due to its largely fermentative function. It also has protective functions (producing hydrogen peroxide) in the vagina. L. gasseri produces gassericin A, a bacteriocin, toxic to E.coli and a wide range of soil-borne bacteria 

Lactobacillus gasseri strain SBT2055 (LG2055) showed its abilities to reduce stomach fat (abdominal adiposity) even at doses as low as the order of 10(8) cfu/d. Constant consumption might be needed to maintain the effect.

Lactobacillus gasseri BNR17 isolated from human breast milk can inhibit obesity and diabetic activities in the human body, but weight reduction after taking this probiotic is very small.

Lactobacillus gasseri OLL2716 proved effective in both suppressing H. pylori colonization of the stomach and reducing gastric mucosal inflammation. L. gasseri OLL2716 strain contained in a yogurt drink can colonize the gastric mucus layer in infected patients. It does so by coccoid conversion of H. pylori  (manifestation of their death) due to dl-lactic acid. 

Firmicutes, Lactobacilli bacteria that naturally inhabits the gut and is used as probiotics. L. reuteri produces antimicrobial substabces reuterin, reutericin  and reutericyclin. It is found in breast milk and many probiotic yogurts. 
L. reuteri  is used to alleviate rotavirus-induced diarrhea, especially in children, food-borne pathogens and protects against many common infections. It can ameliorate gingivitis and fight tooth decay. 
L. reuteri  was shown to improve autistic social behavior (like spending less time with peers) but did not seem to help with anxiety. It may also lower low density cholesterol (LDL) levels.

a fragrant tropical grass that yields an oil that smells lemon. It is widely used in Asian cooking and in perfumery and medicine. Normally, chefs use this substance in small amounts as a flavor enhancer.

You can eat raw lemongrass including the stalk. However, it might not be easily chewable, so better if removed before rinsing off and consuming the bottom bulb. Green lemon grass stalks may be added to rice in a pressure cooker.
To use lemongrass in marinades, stir-fries, salads, spice rubs, and curry pastes, use only the bottom 4 inches or so for finely chopping or mincing. The most common uses of lemongrass includes soups, teas and curries. You can brew the tea by steeping one teaspoon of fresh or dried lemongrass in a cup of hot water for about 10 minutes

Nutritionally, lemongrass is a good source of vitamins A and C, folate, folic acid, magnesium, zinc, copper, iron, potassium, phosphorus, calcium and manganese. It also has minute traces of B vitamins.

Lemongrass may have a number of healing properties making heart work more efficiently, preventing spikes in blood sugar and acting as an antioxidant. 

brand name of cleaning and disinfecting products. The original active ingredient of Lysol was cresol (methylphenol isomers derived from coal tar). The active ingredient in many of the Lysol products is benzalkonium chloride, organic salt classified as an ammonium compound. The active ingredient in the Lysol Power and Free line is hydrogen peroxide. Other active ingredients include Ethanol/SD Alcohol, Isopropyl alcohol, p-Chloro-o-benzylphenol, o-Phenylphenol, Chlorophenol, Potassium hydroxide, dimethylbenzyl ammonium saccharinate, Alkyl (C12-C18) dimethylbenzylammonium chloride, Alkyl (C12-C16) dimethylbenzylammonium chloride and Lactic acid. 
In the past, Lysol was used to fight cholera and flu epidemics.  

Essential amino acid (can't be made by the body and should be included in a healthy diet) that has basic (opposite to acidic) properties. It is a constituent of most proteins. 
Lysine deficiency may lead to Anemia -- a condition in which red blood cell levels are unusually low. Symptoms associated with anemia include pale skin, dizziness, pronounced fatigue, headache, cold extremities. Lysine deficiency also may result in immunodeficiency. Low Lysine levels have been found in patients with Parkinson's, hypothyroidism, kidney disease, asthma and depression
Industrially, L-lysine is usually manufactured by a fermentation process using Corynebacterium glutamicum. 

​Inhaling and exhaling through left nostril. Enhances right brain hemisphere responsible for creativity and imagination. Could also help with mental focus, and a deep, full relaxation or sleep. Breathing through the left nostril for five minutes could also lower your blood pressure.

Learn more about Right nostril breathing.