Is this product useful for swimmers?

In my opinion, yes. This is a deep tissue oxygenator. Oxygen is a foundational energy delivery system of the body. My experience with this product is that I can have a heavy leg day today and recover well enough to run 3 miles non-stop tomorrow. I hope this helps with your decision.

Is this the direct replacement of oxydrene elite deep tissue oxygenator?

Yes, you get the same benefits as the former Oxydrene Elite product, plus now the new formula is able to increase your NAD+ levels, which is a coenzyme that every cell in your body needs in order to produce energy. Increasing levels supports improved energy, mental focus, and cardiovascular health.*

Does the L-tryptophan make you tired or sleepy?

The body uses tryptophan to help make melatonin and serotonin. Melatonin helps regulate the sleep-wake cycle, and serotonin is thought to help regulate appetite, sleep, mood, and pain. The liver can also use tryptophan to produce niacin (vitamin B3), which is needed for energy metabolism and DNA production.

I ordered this for one time sale why do I keep getting it

You must of accidentally left it on auto order which will send you the item every so often. Make sure when you order anything else and if you don't want auto order to just mark the box, 'one time'.

ASIN	B09JFZ25D1
Age Range Description	Adult
Best Sellers Rank	#99,169 in Health ( See Top 100 in Health ) #2,792 in Multiple Vitamin-Mineral Combination Supplements
Brand	Novex Biotech
Brand Name	Novex Biotech
Color	red
Container Type	Bottle
Customer Reviews	4.4 out of 5 stars 460 Reviews
Diet Type	Vegan
Dosage Form	Capsule
Flavor	Unflavored
Flavour	Unflavored
Item Dimensions	10.4 x 6.4 x 15.5 centimeters
Item Form	Capsule
Item dimensions L x W x H	10.4 x 6.4 x 15.5 centimeters
Item form	Capsule
Manufacturer	Novex Biotech
Manufacturer Part Number	856528001735
Material Features	Natural
Material Type Free	en_AE
Model Name	856528001735
Number of Items	1
Primary Supplement Type	Vitamin B3
Primary supplement type	Vitamin B3
Product Benefits	Vascular Health Support
Special Ingredients	Coenzyme Q
Specific Uses For Product	Laboratory
Total Servings Per Container	30.0
UPC	856528001735
Unit Count	60.0 Count
Unit count	60.0 Count

Novex Biotech Oxydrene NAD+ Enhancer - Natural Supplement Promoting Metabolism and Cardiovascular Support for Men and Women - (60 Capsules)

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