Racetam products are the best nootropic drugs designed to induce sleep. It is useful for treating motion sicknesses such as stress, depression and other mental related disorders. They contain endogenous neurotransmitters such as GABA which helps the body to decrease neuronal excitability and stress. All racetam products are characterized by a shared 2- pyrrolidone base structure knows as lactam or cyclic amide.

Racetam products have a 5 sided cyclic ring with an open nitrogen and a carboxyl group. The existence of racetam family groups is made possible by open nitrogen. Racetam family products are useful for enhancing cognitive processes.
Some of the items included in this are: Piracetam, Aniracetam, Pramiracetam, oxiracetam, noopept, Coluracetam, Phenylpiracetam, and Fasoracetam.These compounds are odorless white powder. Some of them are widely touted as fat-soluble compounds that require being taken with fat to be absorbed quickly. Racetam compounds are derived from GABA but don’t react like GABA when absorbed in the body. They are the positive allosteric modulator of the NMDA and AMPA receptors. This facilitate the enhancement of neuronal transmission.

Racetams compounds bind to the second site of the body excitatory receptors which modulate the receptor’s function by glutamate.  Advanced racetam products such coluracetam, fasoracetam, phenylpiracetam, and pramiracetam are available in powder form. Another racetam such as aniracetam, noopept, oxiracetam and piracetam can be found in capsules form.
Here are the standard Dosages for Each Racetam
Fasoracetam and coluracetam 20mg- 40mg
Phenylpiracetam 100mg-200mg
Pramiracetam 600mg- 1.2g
Oxiracetam 500mg-1g
Aniracetam 750mg-1.5g
Piracetam 800mg-2.4g
The average effect  is 5 hours per day. It is possible for the users to take a dosage three times a day to get more results. Racetam products have the ability to reduce stress by enhancing the effects of GABA receptors.Here is a break down of some of the best performing nootropics.

Aniracetam: BASIC NOOTROPIC CAPSULES SAMPLE PACK
Aniracetam Capsules

It has mood boosting properties, anxiolytic and supports cognitive functions. It selectively modulates the AMPA receptor and its mood boosting properties might be mediated through the D2, nACh, or 5-HT2A receptors

Oxiracetam

Oxiracetam is a mild stimulating racetam with notable efficacy in reducing cognitive decline in the elderly, along with anecdotal evidence for improving cognitive function in younger, healthy individuals.

Fasoracetam

Powder is a nootropic compound in the Racetam family and it helps to improve stress and mood levels.

Coluracetam Powder

Coluracetam powder induces long-lasting cognitive improvements of the choline system.

Phenylpiracetam

The substance is also used to increase cognition in seniors.

Noopet

Noopept Powder is known to interact with glutamatergic system, modifying receptors to become more sensitive to glutamate.

Piracetam Powder

Piracetam provides a mild boost to brain function and improve general cognition.

Piracetam Powder125g or 250g

It enhance the brain to improve learning and memory.

Sources: http://nootropicsdepot.com/articles/ultimate-guide-to-nootropics-part-2-racetams-the-original-nootropic-family-/